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17-4.262 10.129-9.273 12.3l-22.613 9.797-6.672-37.738c13.062-8.066 28.293-17.863 44.395-28.996zm120.65-178.29c-43.375 72.19-163.76 144.25-199.62 164.62-2.547 1.44-5.883.964-7.957-1.102l-9.047-9.05c-.004-.005-.004-.009-.008-.017l-46.203-46.203c-.004-.003-.008-.003-.015-.007l-9.051-9.051c-2.11-2.113-2.567-5.383-1.102-7.957 20.363-35.863 92.426-156.25 164.62-199.62 27.97-16.801 97.055-22.465 125.87-24.133 1.848 0 3.567.742 4.84 2.09a6.61 6.61 0 0 1 1.8 4.972c-1.651 28.41-7.316 97.496-24.12 125.46z"></path><path d="M467.91 235.17c-13.07 0-25.355 5.09-34.602 14.332-19.07 19.074-19.07 50.117 0 69.191 9.238 9.238 21.523 14.332 34.594 14.332 13.066 0 25.355-5.086 34.594-14.332 19.074-19.074 19.074-50.113 0-69.195-9.23-9.242-21.516-14.328-34.586-14.328zm21.203 70.125c-5.664 5.664-13.195 8.781-21.203 8.781s-15.539-3.117-21.203-8.781c-11.688-11.691-11.688-30.711 0-42.406 5.664-5.664 13.195-8.781 21.203-8.781s15.539 3.117 21.203 8.781c11.691 11.691 11.691 30.715 0 42.406zM218.71 480.91c-13.996 0-27.152 5.45-37.043 15.344-18.645 18.637-18.91 72.832-18.773 83.504.066 5.133 4.215 9.281 9.352 9.352l1.324.007c19.066 0 65.242-1.828 82.184-18.773 9.894-9.894 15.344-23.05 15.344-37.043 0-13.996-5.45-27.152-15.344-37.043-9.89-9.894-23.047-15.348-37.043-15.348zm23.652 76.035c-8.16 8.16-35.543 12.328-60.426 13.094.707-22.766 4.75-52.027 13.121-60.395 6.316-6.316 14.715-9.793 23.652-9.793s17.332 3.477 23.652 9.793c6.316 6.316 9.793 14.715 9.793 23.652 0 8.934-3.477 17.332-9.793 23.648z"></path></svg><h3>Performant</h3><p>In most cases, the connection will be established with WebSocket, providing a low-overhead communication channel between the server and the client.</p></div></div><div class="col col--4"><div class="feature_eSJM text--center padding-horiz--md"><svg width="752pt" height="752pt" viewBox="0 0 752 752" xmlns="http://www.w3.org/2000/svg" class="icon_irjl"><path d="M310.17 297.39c-4.262-4.262-11.367-4.262-16.102 0l-48.305 48.305-20.363-20.363c-4.262-4.262-11.367-4.262-16.102 0-4.262 4.262-4.262 11.367 0 16.102l27.941 27.941c2.367 2.367 5.21 3.316 8.05 3.316 2.84 0 5.684-.945 8.052-3.316l56.355-56.355c5.21-4.262 5.21-11.367.472-15.629z"></path><path d="M590.54 421.46c6.629-5.684 10.418-14.207 10.418-23.68 0-17.523-14.207-31.73-31.73-31.73-5.21 0-18.941 0-33.152.473-14.68 0-30.309.472-36.465.472-1.422 0-2.367 0-2.84-.472s-.472-.946-.472-1.422c5.21-21.785 11.367-50.2 13.262-59.672 3.316-16.574-6.157-31.258-23.68-35.992-17.523-5.211-34.57 2.367-40.727 16.574-8.524 21.312-36.938 73.406-66.773 91.875-.473 0-.473.472-.946.472-4.261-3.316-9.945-5.21-15.629-5.21h-.945c4.734-12.312 8.05-25.574 8.05-39.781l-.007-70.082c0-5.684-4.262-10.418-9.945-11.367-68.195-7.106-88.086-45.938-88.56-47.832-1.894-3.79-5.683-6.157-9.945-6.157s-8.05 2.368-9.945 6.157c-.945 1.894-20.836 40.727-88.559 47.832-6.633.949-10.895 5.683-10.895 11.367v70.09c0 82.875 99.453 134.97 103.71 137.34 1.422.945 3.316 1.421 5.21 1.421 1.895 0 3.317-.472 5.212-1.421 1.422-.946 13.734-7.579 29.363-18.941v65.355c0 14.68 11.84 26.52 26.52 26.52h41.203c7.578 0 14.207-2.84 18.94-8.051 13.735 9.472 36.939 17.996 62.985 17.996h109.4c17.523 0 31.73-14.207 31.73-31.73 0-6.63-1.895-12.785-5.211-17.523 6.629-5.684 10.418-14.207 10.418-23.68 0-6.63-1.895-12.785-5.211-17.523 6.629-5.684 10.418-14.207 10.418-23.68 0-7.102-1.894-13.262-5.207-17.996zm-330.56 26.047c-19.414-11.367-86.191-54.934-86.191-114.13v-60.145c47.832-7.106 73.879-29.363 86.664-44.043 12.785 15.156 38.832 36.938 86.664 44.043l.004 60.145c0 14.207-3.79 27.469-9.945 39.781H322.02c-14.68 0-26.52 11.84-26.52 26.52v23.68c-14.68 11.367-28.414 19.891-35.52 24.152zm106.56 69.617a4.244 4.244 0 0 1-4.262 4.262h-41.203a4.244 4.244 0 0 1-4.261-4.262v-117.92a4.244 4.244 0 0 1 4.261-4.262h41.203a4.244 4.244 0 0 1 4.262 4.262zm202.69-109.87h-13.262c-6.156 0-10.891 4.734-10.891 10.891s4.734 10.891 10.891 10.891h8.05c5.212 0 9.474 4.262 9.474 9.473 0 5.21-4.262 9.472-9.473 9.472h-12.785c-6.156 0-10.891 4.735-10.891 10.891s4.734 10.891 10.89 10.891h8.052c5.21 0 9.472 4.262 9.472 9.473 0 5.211-4.261 9.473-9.472 9.473H546.5c-6.157 0-10.891 4.734-10.891 10.89s4.734 10.892 10.89 10.892h8.051c5.211 0 9.473 4.262 9.473 9.473 0 5.21-4.262 9.472-9.473 9.472l-110.35.004c-30.309 0-51.148-13.262-55.41-17.996v-115.08c0-.945.473-1.894 1.422-2.367 37.887-23.207 68.195-83.352 75.773-102.77 1.895-4.262 8.524-5.211 13.734-3.79 3.317.946 9.473 3.79 8.051 10.892-1.422 7.105-6.156 27.94-12.785 58.723-1.422 7.105 0 14.207 4.734 19.89 4.735 5.684 11.367 8.997 18.47 8.997 5.21 0 21.784 0 38.358-.473 13.734 0 27.47-.472 32.676-.472 5.211 0 9.473 4.261 9.473 9.472.004 8.528-4.258 12.79-9.469 12.79z"></path></svg><h3>Reliable</h3><p>Rest assured! In case the WebSocket connection is not possible, it will fall back to HTTP long-polling. And if the connection is lost, the client will automatically try to reconnect.</p></div></div><div class="col col--4"><div class="feature_eSJM text--center padding-horiz--md"><svg width="752pt" height="752pt" viewBox="0 0 752 752" xmlns="http://www.w3.org/2000/svg" class="icon_
17irjl"><path d="M531.39 154.01c-36.719 0-66.598 29.871-66.598 66.598 0 15.391 5.297 29.547 14.105 40.84l-95.285 96.406c-14.121-11.758-32.25-18.852-52.016-18.852-15.16 0-29.309 4.238-41.484 11.492l-44.043-88.086c15.867-10.637 26.332-28.719 26.332-49.203 0-32.641-26.559-59.199-59.199-59.199s-59.199 26.559-59.199 59.199 26.559 59.199 59.199 59.199c6.883 0 13.469-1.242 19.617-3.41l45.16 90.32c-16.98 14.926-27.777 36.746-27.777 61.082 0 19.78 7.11 37.922 18.883 52.05l-44.996 44.997c-7.262-5.172-16.109-8.25-25.684-8.25-24.484 0-44.398 19.914-44.398 44.398s19.914 44.398 44.398 44.398 44.398-19.914 44.398-44.398c0-9.574-3.078-18.426-8.25-25.684l44.996-44.996c14.125 11.77 32.27 18.883 52.047 18.883 30.348 0 56.824-16.723 70.816-41.418l62.512 31.258c-.027.926-.133 1.828-.133 2.762 0 36.727 29.88 66.598 66.598 66.598s66.598-29.871 66.598-66.598c0-36.727-29.879-66.598-66.598-66.598-30.44 0-56.125 20.555-64.035 48.504l-58.863-29.438c2.867-8.31 4.504-17.188 4.504-26.47 0-19.792-7.117-37.952-18.914-52.077l95.11-96.234c11.5 9.437 26.194 15.117 42.198 15.117 36.72 0 66.598-29.871 66.598-66.598 0-36.723-29.879-66.594-66.598-66.594zM168.8 213.205c0-24.484 19.914-44.398 44.398-44.398s44.398 19.914 44.398 44.398-19.914 44.398-44.398 44.398-44.398-19.91-44.398-44.398zm362.59 229.39c28.562 0 51.797 23.242 51.797 51.797 0 28.555-23.234 51.797-51.797 51.797s-51.797-23.242-51.797-51.797c0-28.555 23.234-51.797 51.797-51.797zm-332.98 140.59c-16.324 0-29.598-13.273-29.598-29.598s13.273-29.598 29.598-29.598c16.324 0 29.598 13.273 29.598 29.598s-13.277 29.598-29.598 29.598zM331.6 486.99c-36.719 0-66.598-29.871-66.598-66.598 0-36.727 29.879-66.598 66.598-66.598s66.598 29.871 66.598 66.598c0 36.727-29.879 66.598-66.598 66.598zM531.39 272.4c-28.562 0-51.797-23.242-51.797-51.797s23.234-51.797 51.797-51.797 51.797 23.242 51.797 51.797S559.953 272.4 531.39 272.4z"></path><path d="M435.2 191.01c0-20.402-16.598-37-37-37s-37 16.598-37 37 16.598 37 37 37 37-16.598 37-37zm-59.199 0c0-12.238 9.96-22.199 22.199-22.199s22.199 9.96 22.199 22.199c0 12.238-9.96 22.199-22.199 22.199s-22.199-9.96-22.199-22.199zM361.2 279.8c0-20.402-16.598-37-37-37s-37 16.598-37 37 16.598 37 37 37 37-16.598 37-37zm-59.199 0c0-12.238 9.96-22.199 22.199-22.199s22.199 9.96 22.199 22.199c0 12.238-9.96 22.199-22.199 22.199s-22.199-9.96-22.199-22.199zM168.81 438.9c0 18.359 14.941 33.301 33.301 33.301s33.297-14.941 33.297-33.297c0-18.363-14.938-33.301-33.297-33.301S168.81 420.541 168.81 438.9zm33.301-18.5c10.195 0 18.5 8.297 18.5 18.5s-8.305 18.5-18.5 18.5c-10.199 0-18.5-8.297-18.5-18.5s8.3-18.5 18.5-18.5zM176.21 316.8c-12.238 0-22.199 9.96-22.199 22.199 0 12.238 9.96 22.199 22.199 22.199 12.238 0 22.199-9.96 22.199-22.199 0-12.238-9.96-22.199-22.199-22.199zm0 29.598c-4.078 0-7.398-3.316-7.398-7.398 0-4.086 3.324-7.399 7.398-7.399 4.078 0 7.398 3.317 7.398 7.399s-3.324 7.398-7.398 7.398zM442.6 376c0 24.484 19.914 44.398 44.398 44.398s44.398-19.914 44.398-44.398-19.914-44.398-44.398-44.398S442.6 351.516 442.6 376zm74 0c0 16.324-13.273 29.598-29.598 29.598S457.404 392.325 457.404 376s13.273-29.598 29.598-29.598c16.32 0 29.598 13.273 29.598 29.598zM383.4 509.2c-24.484 0-44.398 19.914-44.398 44.398s19.914 44.398 44.398 44.398 44.398-19.914 44.398-44.398S407.884 509.2 383.4 509.2zm0 73.996c-16.324 0-29.598-13.273-29.598-29.598S367.075 524 383.4 524c16.324 0 29.598 13.273 29.598 29.598s-13.273 29.598-29.598 29.598zM538.79 324.2c0 16.324 13.273 29.598 29.598 29.598s29.598-13.273 29.598-29.598-13.273-29.598-29.598-29.598c-16.32 0-29.598 13.273-29.598 29.598zm44.398 0c0 8.16-6.637 14.801-14.801 14.801-8.16 0-14.801-6.637-14.801-14.801 0-8.16 6.637-14.801 14.801-14.801s14.801 6.64 14.801 14.801z"></path></svg><h3>Scalable</h3><p>Scale to multiple servers and send events to all connected clients with ease.</p></div></div></div></div></section><section class="container example_frfu"><h3 class="text--center">Basic example</h3><div class="windows_oHbZ"><img class="window_u05t" src="/assets/images/homepage-server-40e4108715950ea259baf9ff4a30d3ef.png" alt="Browser window with server example"><img class="window_u05t" src="/assets/images/homepage-client-1995dae8bc27cf59f8551828f6bbd11b.png" alt="Browser window with client example"></div><p class="text--center">Run this example on<span> </span><a href="https://replit.com/@socketio/socketio-minimal-example">Replit</a><span> / </span><a href="https://stackblitz.com/edit/socketio-base?file=index.js">StackBlitz</a><span> / </span><a href="https://codesandbox.io/s/socket-io-minimal-example-k3h2l">CodeSandbox</a></p></section><div class="list_ngVb"><h3>Latest blog posts</h3><div><ul><li class="item_JHv5">August 22, 2025 - <a href="/blog/bun-engine/">Bun engine</a></li><li class="item_JHv5">July 25, 2024 - <a href="/blog/npm-package-provenance/">npm package provenance</a></li><li class="item_JHv5">July 12, 2024 - <a href="/blog/monorepo/">Socket.IO monorepo</a></li><li class="item_JHv5">March 29, 2024 - <a href="/blog/three-new-adapters/">Three new adapters</a></li><li class="item_JHv5">January 12, 2024 - <a href="/blog/chat-platform/">Chat platform</a></li></ul>Blog feed: <a href="/blog/rss.xml">RSS</a> / <a href="/blog/atom.xml">atom</a></div></div><div class="list_LQXo"><h3>Our sponsors</h3><div><div class="sponsor_MeGJ"><a href="https://casino-professor.com/" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/casino-professor/9e870a2/logo.jpg" alt="Casino Professor" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://www.credimaxx.de/" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/credimaxx-r-gmbh/db26e4e/logo.jpg" alt="CrediMaxx® GmbH" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://streamlabs.com" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/streamlabs/63ce158/logo.jpg" alt="Streamlabs" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://casinority.com/au/" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/casinority-australia/6f18bae/avatar.jpg" alt="Casinority Australia" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://writingmetier.com/" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/writing-metier/762e081/logo.jpg" alt="Writing Metier" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://www.whitehatcasinos.com" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/whitehatcasinos-com/ccbf57d/logo.jpg" alt="WhiteHatCasinos.com" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://www.voetbalgokken.nl" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/voetbalgokken1/60fff47/logo.jpg" alt="VoetbalGokken" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://www.wizardslots.com" target="_blank" rel="sponsored noopener"><img src="https://images.opencollective.com/wizard-slots/55d2adc/logo.jpg" alt="Wizard Slots" loading="lazy"></a></div><div class="sponsor_MeGJ"><a href="https://www.busybeebingo.co.uk/" target="_blank" rel="sponsored noopener">
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