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defer=""></script><script src="https://app.buildwithfern.com/_next/static/chunks/6053-650d4d047bc1ec89.js?dpl=dpl_8mxntyMQj3QAQsy9kB9xiwdByRmJ" defer=""></script><script src="https://app.buildwithfern.com/_next/static/chunks/pages/static/%5Bdomain%5D/%5B%5B...slug%5D%5D-31f428dae64597dc.js?dpl=dpl_8mxntyMQj3QAQsy9kB9xiwdByRmJ" defer=""></script><script src="https://app.buildwithfern.com/_next/static/okNHlkrMlX3J9dSzTzB4h/_buildManifest.js?dpl=dpl_8mxntyMQj3QAQsy9kB9xiwdByRmJ" defer=""></script><script src="https://app.buildwithfern.com/_next/static/okNHlkrMlX3J9dSzTzB4h/_ssgManifest.js?dpl=dpl_8mxntyMQj3QAQsy9kB9xiwdByRmJ" defer=""></script><style id="__jsx-827838179"> :root { --typography-body-font-family: 'Sohne', -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif; --typography-heading-font-family: 'Audimat', -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif; --typography-code-font-family: ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace; --spacing-page-width: 88rem; --spacing-content-width: 44rem; --spacing-content-wide-width: 66.5rem; --spacing-sidebar-width: 18rem; --spacing-header-height: 6.75rem; --spacing-header-height-padded: 5rem; --spacing-header-height-real: 4rem; --grayscale-1: var(--mauve-1); --grayscale-2: var(--mauve-2); --grayscale-3: var(--mauve-3); --grayscale-4: var(--mauve-4); --grayscale-5: var(--mauve-5); --grayscale-6: var(--mauve-6); --grayscale-7: var(--mauve-7); --grayscale-8: var(--mauve-8); --grayscale-9: var(--mauve-9); --grayscale-10: var(--mauve-10); --grayscale-11: var(--mauve-11); --grayscale-12: var(--mauve-12); --grayscale-a1: var(--mauve-a1); --grayscale-a2: var(--mauve-a2); --grayscale-a3: var(--mauve-a3); --grayscale-a4: var(--mauve-a4); --grayscale-a5: var(--mauve-a5); --grayscale-a6: var(--mauve-a6); --grayscale-a7: var(--mauve-a7); --grayscale-a8: var(--mauve-a8); --grayscale-a9: var(--mauve-a9); --grayscale-a10: var(--mauve-a10); --grayscale-a11: var(--mauve-a11); --grayscale-a12: var(--mauve-a12); --accent-1: #fdfdfe; --accent-2: #f6f9ff; --accent-3: #ecf2ff; --accent-4: #dee9ff; --accent-5: #cddeff; --accent-6: #bad0ff; --accent-7: #a3bdff; --accent-8: #83a2ff; --accent-9: #405bff; --accent-10: #3951e2; --accent-11: #3850e1; --accent-12: #1c2a67; --accent-a1: #00008002; --accent-a2: #0055ff09; --accent-a3: #0051ff13; --accent-a4: #0055ff21; --accent-a5: #0057ff32; --accent-a6: #0052ff45; --accent-a7: #0049ff5c; --accent-a8: #0040ff7c; --accent-a9: #0024ffbf; --accent-a10: #001fdac6; --accent-a11: #001fd9c7; --accent-a12: #001054e3; --accent-surface: #f4f8ffcc; --gray-surface: #ffffffcc; --accent: 64, 91, 255; --accent-aa: 64, 91, 255; --accent-aaa: 18, 52, 255; --accent-tinted: 38, 69, 255; --background: 255, 255, 255; --accent-contrast: rgb(255, 255, 255); --bg-color-card: rgba(255, 255, 255, 0.7); --sidebar-background: transparent; --header-background: rgb(0, 0, 0); --border: var(--grayscale-a4); --border-concealed: var(--grayscale-a2); --body-text: 0, 0, 0; --body-text-inverted: 255, 255, 255; } @media (max-width: 1024px) { :root { --spacing-header-height: 6.75rem; --spacing-header-height-padded: 5rem; } } :is(.dark) { --grayscale-1: var(--gray-1); --grayscale-2: var(--gray-2); --grayscale-3: var(--gray-3); --grayscale-4: var(--gray-4); --grayscale-5: var(--gray-5); --grayscale-6: var(--gray-6); --grayscale-7: var(--gray-7); --grayscale-8: var(--gray-8); --grayscale-9: var(--gray-9); --grayscale-10: var(--gray-10); --grayscale-11: var(--gray-11); --grayscale-12: var(--gray-12); --grayscale-a1: var(--gray-a1); --grayscale-a2: var(--gray-a2); --grayscale-a3: var(--gray-a3); --grayscale-a4: var(--gray-a4); --grayscale-a5: var(--gray-a5); --grayscale-a6: var(--gray-a6); --grayscale-a7: var(--gray-a7); --grayscale-a8: var(--gray-a8); --grayscale-a9: var(--gray-a9); --grayscale-a10: var(--gray-a10); --grayscale-a11: var(--gray-a11); --grayscale-a12: var(--gray-a12); --accent-1: #131828; --accent-2: #151b2e; --accent-3: #192555; --accent-4: #1d2c70; --accent-5: #243583; --accent-6: #2c3f94; --accent-7: #354ba9; --accent-8: #3e57c6; --accent-9: #405bff; --accent-10: #364bef; --accent-11: #94b2ff; --accent-12: #d3e1ff; --accent-a1: #000bfb11; --accent-a2: #002ff918; --accent-a3: #1947fe43; --accent-a4: #244bfe61; --accent-a5: #3156ff76; --accent-a6: #3c5ffe89; --accent-a7: #4669ffa0; --accent-a8: #4b6cffc0; --accent-a9: #405bff; --accent-a10: #384efeee; --accent-a11: #94b2ff; --accent-a12: #d3e1ff; --accent-surface: color(display-p3 0.0745 0.1098 0.251 / 0.5); --gray-surface: color(display-p3 0 0 0 / 5%); --accent: 64, 91, 255; --accent-aa: 95, 117, 255; --accent-aaa: 140, 157, 255; --accent-tinted: 38, 69, 255; --background: 25, 25, 25; --accent-contrast: rgb(255, 255, 255); --bg-color-card: rgba(20, 20, 20, 0.5); --bg-color-card-solid: rgb(22, 22, 22); --sidebar-background: transparent; --header-background: rgb(0, 0, 0); --border: var(--grayscale-a4); --border-concealed: var(--grayscale-a2); --body-text: 255, 255, 255; --body-text-inverted: 0, 0, 0; } @font-face { font-family: 'Sohne'; src: url('https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/Sohne-Buch.woff2') format('woff2'); font-weight: 400; font-style: normal; font-display: swap; } @font-face { font-family: 'Audimat'; src: url('https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/Audimat3000-Regular.woff2') format('woff2'); font-weight: 400; font-style: normal; font-display: swap; } html { background-color: #ffffff; } html.dark { background-color: #191919; } div.fern-logo-container img { @media screen and (max-width: 450px) { width: 22px !important; object-fit: cover !important; object-position: right !important; } } .sdk-grid { .fern-mdx-link { font-weight: 500; text-decoration: none; } } .ul-container { border: 1px solid #d1d3d4 !important; background-color: #f8f8f8; border-radius: 4px; padding-left: 1.5rem; padding-right: 1.5rem; padding-top: 1.5rem; padding-bottom: 2rem; max-width: 60rem; ul { list-style: none; } } .sdk-container { width: 100%; } :is(.dark) .ul-container { background-color: #d1d3d4; } .div-container { display: grid; grid-template-columns: repeat(5, 1fr); row-gap: 0.75rem; font-size: 1rem; color: #405bff; text-align: center; } .h4-fill { font-size: 1rem; line-height: 2rem; margin-bottom: 0.5rem; scroll-margin-top: 5.5rem; } .css-1j7u8l9 { box-sizing: border-box; margin: 0; min-width: 0; color: #405bff; padding: 0.5rem; text-decoration: none; display: flex; flex-direction: column; align-items: center; font-size: 1rem; cursor: pointer; } .css-1kenqwn h4 { scroll-margin-top: 5.5rem; } .css-p1fll { font-size: 1rem; line-height: 2rem; margin-bottom: 0.5rem; } .css-1j7u8l9 path { fill: #58595b; } .css-1j7u8l9:hover path, .css-1j7u8l9:hover polygon, .css-1j7u8l9:hover rect { fill: #405bff; } .css-1j7u8l9:hover { color: unset; text-decoration: none; } .css-1j7u8l9 p { color: #405bff; margin-top: 0.75rem; } .css-1j7u8l9 svg { height: 2rem; } .side { width: 40%; padding-left: 0.5rem; margin-left: 0.5rem; float: right; } .column { display: flex; width: 60%; flex-direction: column; } .row { display: flex; flex-direction: row; justify-content: space-between; } .center { display: flex; flex-direction: column; align-items: center; padding: 0px 200px; } @media screen and (max-width: 860px) { .center { padding: 0px 0px !important; } } /* h1 is only heading level that should use Audimat font, so manually setting other heading levels to use Sohne */ h2, h3, h4 { font-family: Sohne; } h4 { line-height: 1.5rem; } .center h3, .center p { margin-bottom: 15px; } .center p { @media screen and (max-width: 860px) { font-size: 0.98rem; } } .center h1 { font-size: 3.5rem; line-height: 5rem; font-weight: 400; @media screen and (max-width: 742px) { font-size: 2rem; line-height: 2.4rem; padding: 0px 20px !important; text-align: center; } } .center h2 { font-size: 2.25rem; } .center h3 { font-size: 1.23rem; line-height: 1.56rem; font-weight: 400; } .heading-container { display: flex; flex-direction: column; align-items: center; text-align: center; width: 100%; max-width: 800px; @media screen and (max-width: 860px) { padding: 0 18px; gap: 12px; } } .darker { margin-bottom: 40px; padding: 100px 0px; width: 100vw; color: white; font-size: 24px; background: linear-gradient(0deg, rgba(81, 52, 124, 1) 0%, rgba(0, 0, 0, 0) 100%); display: flex; flex-direction: column; position: relative; align-items: center; z-index: -2; overflow: hidden; @media screen and (max-width: 860px) { margin-bottom: 0px; padding-top: 80px; } } :is(.light) .darker { background: linear-gradient(0deg, #C9ADF2 0%, rgba(255, 255, 255, 0) 100%); } .hero-image-container { position: relative; max-width: 1260px; width: 100%; margin: 0 auto; top: 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border-right-width: 0px; border-left-width: 0px; } :is(.dark) .fern-sidebar-container { border-right-width: 0px; border-left-width: 0px; } </style><div class="fern-body"><div class="fern-main fern-sidebar-disabled"><main><style> h1 { background: linear-gradient(204deg, #fff -20.65%, #f7f8ff 47.15%, #7084ff 132.52%); -webkit-background-clip: text; -webkit-font-smoothing: antialiased; -webkit-text-fill-color: transparent; } :is(.light) h1 { background: linear-gradient(257.01deg, #000000 0%, #000000 47.15%, #7084FF 100%); -webkit-background-clip: text; -webkit-font-smoothing: antialiased; -webkit-text-fill-color: transparent; } h3 { color: #D1D3D4; } :is(.light) h3 { color: #58595B; } .floating { animation: floating 4s ease-in-out infinite !important; } @keyframes floating { 0% { transform: translate(0, 0px); } 50% { transform: translate(0, 20px); } 100% { transform: translate(0, -0px); } } div.custom-cards { margin-block: 50px; .fern-card { background-color: #181a1f; border: 1px solid 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860px) { grid-template-columns: repeat(1, 1fr); margin-bottom: 40px; } } .resource-item { display: flex; flex-direction: column; border: 1px solid #ffffff11; padding: 25px; gap: 16px; border-radius: 10px; position: relative; text-decoration: none; font-weight: 500; .external-link-icon { display: none !important; } > img { width: 48px; } > p { line-height: 1.5rem; } > .fa-icon { position: absolute; top: 25px; right: 25px; } &:hover { border-color: #ffffff3a; background-color: #ffffff0e; } } :is(.light) .resource-item { border: 1px solid #0000001A; color: #58595b; &:hover { border-color:rgba(41, 41, 41, 0.2); background-color:rgba(107, 107, 107, 0.05); } } </style> <div class="center"><div class="darker"><div class="heading-container"><h1 id="welcome-to-launchdarkly-docs">Welcome to LaunchDarkly docs</h1><h3 id="learn-how-to-use-launchdarkly-to-release-faster-break-nothing-andbuild-products-customers-love"><p>Learn how to use LaunchDarkly to release faster, break nothing, and build products customers love</p></h3></div><div class="gap"></div><div class="hero-image-container"><img alt="" loading="lazy" width="1166" height="572" decoding="async" data-nimg="1" class="hero-image" style="color:transparent;aspect-ratio:2.0384615384615383" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/images/hero-image.svg"/></div></div><div class="custom-cards"><div class="my-6 grid gap-4 first:mt-0 sm:gap-6 grid-cols-1 sm:grid-cols-2 xl:grid-cols-3"><a class="fern-card interactive not-prose relative block rounded-xl border p-6 text-base" href="/docs/home/getting-started"><div class="flex items-start flex-col space-y-3"><span class="card-icon" style="width:32px;height:32px"><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/solid/rocket.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/solid/rocket.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></span><div class="w-full space-y-1 overflow-hidden"><div class="t-default text-base font-semibold">Get Started</div><div class="t-muted"><p>Build your first flagged application and explore how LaunchDarkly supports your work.</p></div></div></div></a><a class="fern-card interactive not-prose relative block rounded-xl border p-6 text-base" href="/docs/home/getting-started/launch-insights"><div class="flex items-start flex-col space-y-3"><span class="card-icon" style="width:32px;height:32px"><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/regular/search.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/regular/search.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></span><div class="w-full space-y-1 overflow-hidden"><div class="t-default text-base font-semibold">Launch Insights</div><div class="t-muted"><p>Review how your organization is adopting best practices for releasing safely.</p></div></div></div></a><a class="fern-card interactive not-prose relative block rounded-xl border p-6 text-base" href="/docs/home/ai-configs"><div class="flex items-start flex-col space-y-3"><span class="card-icon" style="width:32px;height:32px"><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/solid/sparkles.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/solid/sparkles.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></span><div class="w-full space-y-1 overflow-hidden"><div class="t-default text-base font-semibold">AI Configs</div><div class="t-muted"><p>Customize, test, and roll out new models and prompts in your generative Al applications.</p></div></div></div></a><a class="fern-card interactive not-prose relative block rounded-xl border p-6 text-base" href="/docs/guides/flags"><div class="flex items-start flex-col space-y-3"><span class="card-icon" style="width:32px;height:32px"><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/solid/flag.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/solid/flag.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></span><div class="w-full space-y-1 overflow-hidden"><div class="t-default text-base font-semibold">Flag impact</div><div class="t-muted"><p>Use metrics, experimentation, and analytics to understand how flag changes affect your audiences.</p></div></div></div></a><a class="fern-card interactive not-prose relative block rounded-xl border p-6 text-base" href="/docs/sdk"><div class="flex items-start flex-col space-y-3"><span class="card-icon" style="width:32px;height:32px"><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/regular/code.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/regular/code.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></span><div class="w-full space-y-1 overflow-hidden"><div class="t-default text-base font-semibold">SDKs</div><div class="t-muted"><p>Learn how to incorporate the LaunchDarkly SDKs into your application.</p></div></div></div></a><a class="fern-card interactive not-prose relative block rounded-xl border p-6 text-base" href="/docs/guides"><div class="flex items-start flex-col space-y-3"><span class="card-icon" style="width:32px;height:32px"><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/solid/book-open.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/solid/book-open.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></span><div class="w-full space-y-1 overflow-hidden"><div class="t-default text-base font-semibold">Guides</div><div class="t-muted"><p>Whether you’re a new or experienced, our best practices and guides help you succeed with LaunchDarkly.</p></div></div></div></a></div></div><section class="more-info"><h2 id="explore-our-sdks" data-state="closed">Explore our SDKs</h2><p>Use client-side, server-side, or edge SDKs to evaluate flags. Use Al SDKs to customize Al configs.</p><h3 id="client-side-and-mobile-sdks" data-state="closed">Client-side and mobile SDKs</h3><div class="sdk-grid"><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/dotnet"><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/dotnet.svg"/><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/dotnet.svg"/><p>.NET</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/android"><img alt="Android logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/android.svg"/><img alt="Android logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/android.svg"/><p>Android</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/c-c--"><img alt="C++ logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/cpp.svg"/><img alt="C++ logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/cpp.svg"/><p>C++</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/electron"><img alt="Electron logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/electron.svg"/><img alt="Electron logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/electron.svg"/><p>Electron</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/flutter"><img alt="Flutter logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/flutter.svg"/><img alt="Flutter logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/flutter.svg"/><p>Flutter</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/ios"><img alt="iOS logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/ios.svg"/><img alt="iOS logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/ios.svg"/><p>iOS</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/javascript"><img alt="JavaScript logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/javascript.svg"/><img alt="JavaScript logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/javascript.svg"/><p>JavaScript</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/node-js"><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/node.svg"/><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/node.svg"/><p>Node.js</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/react"><img alt="React logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/react.svg"/><img alt="React logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/react.svg"/><p>React</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/roku"><img alt="Roku logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/roku.svg"/><img alt="Roku logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/roku.svg"/><p>Roku</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/client-side/vue"><img alt="Vue logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/vue.svg"/><img alt="Vue logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/vue.svg"/><p>Vue</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a></div><h3 id="server-side-sdks" data-state="closed">Server-side SDKs</h3><div class="sdk-grid"><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/dotnet"><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/dotnet.svg"/><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/dotnet.svg"/><p>.NET</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/apex"><img alt="Apex logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/apex.svg"/><img alt="Apex logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/apex.svg"/><p>Apex</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/c-c--"><img alt="C++ logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/cpp.svg"/><img alt="C++ logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/cpp.svg"/><p>C++</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/erlang"><img alt="Erlang logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/erlang.svg"/><img alt="Erlang logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/erlang.svg"/><p>Erlang</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/go"><img alt="Go logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/go.svg"/><img alt="Go logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/go.svg"/><p>Go</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/haskell"><img alt="Haskell logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/haskell.svg"/><img alt="Haskell logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/haskell.svg"/><p>Haskell</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/java"><img alt="Java logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/java.svg"/><img alt="Java logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/java.svg"/><p>Java</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/lua"><img alt="Lua logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/lua.svg"/><img alt="Lua logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/lua.svg"/><p>Lua</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/node-js"><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/node.svg"/><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/node.svg"/><p>Node.js</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/php"><img alt="PHP logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/php.svg"/><img alt="PHP logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/php.svg"/><p>PHP</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/python"><img alt="Python logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/python.svg"/><img alt="Python logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/python.svg"/><p>Python</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/ruby"><img alt="Ruby logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/ruby.svg"/><img alt="Ruby logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/ruby.svg"/><p>Ruby</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/server-side/rust"><img alt="Rust logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/rust.svg"/><img alt="Rust logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/rust.svg"/><p>Rust</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a></div><h3 id="ai-sdks" data-state="closed">AI SDKs</h3><div class="sdk-grid"><a class="fern-mdx-link sdk-item" href="/docs/sdk/ai/dotnet"><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/dotnet.svg"/><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/dotnet.svg"/><p>.NET</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/ai/go"><img alt="Go logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/go.svg"/><img alt="Go logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/go.svg"/><p>Go</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/ai/node-js"><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/node.svg"/><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/node.svg"/><p>Node.js</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/ai/python"><img alt="Python logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/python.svg"/><img alt="Python logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/python.svg"/><p>Python</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a></div><h3 id="edge-sdks" data-state="closed">Edge SDKs</h3><div class="sdk-grid"><a class="fern-mdx-link sdk-item" href="/docs/sdk/edge/akamai"><img alt="Akamai logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/akamai.svg"/><img alt="Akamai logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/akamai.svg"/><p>Akamai</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/edge/cloudflare"><img alt="Cloudflare logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/cloudflare.svg"/><img alt="Cloudflare logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/cloudflare.svg"/><p>Cloudflare</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/edge/fastly"><img alt="Fastly logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/fastly-dark.svg"/><img alt="Fastly logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/fastly-light.svg"/><p>Fastly</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/edge/vercel"><img alt="Vercel logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/vercel.svg"/><img alt="Vercel logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/vercel.svg"/><p>Vercel</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a></div><h3 id="openfeature-providers" data-state="closed">OpenFeature providers</h3><div class="sdk-grid"><a class="fern-mdx-link sdk-item" href="/docs/sdk/openfeature/dotnet"><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/dotnet.svg"/><img alt=".NET logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/dotnet.svg"/><p>.NET</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/openfeature/java"><img alt="Java logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/java.svg"/><img alt="Java logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/java.svg"/><p>Java</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/openfeature/node-js"><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/node.svg"/><img alt="Node.js logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/node.svg"/><p>Node.js</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a><a class="fern-mdx-link sdk-item" href="/docs/sdk/openfeature/php"><img alt="PHP logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/php.svg"/><img alt="PHP logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/php.svg"/><p>PHP</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a></div><h3 id="telemetry-integrations" data-state="closed">Telemetry integrations</h3><div class="sdk-grid"><a class="fern-mdx-link sdk-item" href="/docs/sdk/telemetry/javascript"><img alt="JavaScript logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-dark" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/dark/javascript.svg"/><img alt="JavaScript logo" loading="lazy" width="32" height="32" decoding="async" data-nimg="1" class="sdk-logo-light" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/light/javascript.svg"/><p>JavaScript</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center"></span></a></div><div class="gap"></div><h2 id="additional-resources" data-state="closed">Additional Resources</h2><p>Learn how to use LaunchDarkly with these other useful resources.</p><div class="resource-grid"><a class="fern-mdx-link resource-item" target="_blank" rel="noreferrer" href="https://discord.com/invite/launchdarklycommunity"><img alt="Discord logo" loading="lazy" width="48" height="48" decoding="async" data-nimg="1" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/resources-logos/discord.svg"/><h4 id="launchdarkly-community" data-state="closed">LaunchDarkly Community</h4><p>Join other LaunchDarkly users on Discord.</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-up-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-up-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center;width:20px;height:20px"></span><svg width="1.5em" height="1.5em" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="currentColor" class="external-link-icon"><path d="M21 3L15 3M21 3L12 12M21 3V9" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M21 13V19C21 20.1046 20.1046 21 19 21H5C3.89543 21 3 20.1046 3 19V5C3 3.89543 3.89543 3 5 3H11" stroke="currentColor" stroke-linecap="round"></path></svg></a><a class="fern-mdx-link resource-item" target="_blank" rel="noreferrer" href="https://www.youtube.com/c/LaunchDarkly"><img alt="YouTube logo" loading="lazy" width="48" height="48" decoding="async" data-nimg="1" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/resources-logos/youtube.svg"/><h4 id="launchdarkly-youtube" data-state="closed">LaunchDarkly YouTube</h4><p>Watch videos covering integration demos, SDK overviews, a user interface (Ul) tutorial, and more.</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-up-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-up-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center;width:20px;height:20px"></span><svg width="1.5em" height="1.5em" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="currentColor" class="external-link-icon"><path d="M21 3L15 3M21 3L12 12M21 3V9" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M21 13V19C21 20.1046 20.1046 21 19 21H5C3.89543 21 3 20.1046 3 19V5C3 3.89543 3.89543 3 5 3H11" stroke="currentColor" stroke-linecap="round"></path></svg></a><a class="fern-mdx-link resource-item" target="_blank" rel="noreferrer" href="https://academy.launchdarkly.com/"><img alt="Academy logo" loading="lazy" width="48" height="48" decoding="async" data-nimg="1" style="color:transparent;aspect-ratio:1" src="https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/2025-03-28T23:40:33.925Z/assets/icons/resources-logos/academy.svg"/><h4 id="launchdarkly-academy" data-state="closed">LaunchDarkly Academy</h4><p>Learn more about LaunchDarkly with recommended courses, live or self- guided training, webinars, and other activities.</p><span class="fa-icon" style="mask-image:url("https://icons.ferndocs.com/light/arrow-up-right.svg");mask-repeat:no-repeat;mask-position:center center;-webkit-mask-image:url("https://icons.ferndocs.com/light/arrow-up-right.svg");-webkit-mask-repeat:no-repeat;-webkit-mask-position:center center;width:20px;height:20px"></span><svg width="1.5em" height="1.5em" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="currentColor" class="external-link-icon"><path d="M21 3L15 3M21 3L12 12M21 3V9" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M21 13V19C21 20.1046 20.1046 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