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webrtchacks/adapter

Analysis updated 2026-07-03

3,738JavaScriptAudience · developerComplexity · 2/5Setup · easy

TLDR

A small JavaScript shim that fixes cross-browser differences in WebRTC so you can write video and audio call code once and have it work across Chrome, Firefox, Safari, and other browsers.

Mindmap

mindmap
  root((adapter))
    What it does
      Cross-browser WebRTC fix
      Runtime API shim
      Browser detection
    Tech Stack
      JavaScript
      WebRTC
      npm Bower
    Use Cases
      Video call apps
      Peer-to-peer data
      Audio streaming
    Setup
      npm install
      Import at top
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What do people build with it?

USE CASE 1

Add WebRTC browser compatibility to your web app by importing adapter.js so your video call code works across Chrome, Firefox, and Safari without changes.

USE CASE 2

Use the browser detection utility in adapter.js to identify which browser version a user is running and handle remaining browser-specific quirks in your own code.

What is it built with?

JavaScriptWebRTCnpmBower

How does it compare?

webrtchacks/adapterkach/nearleyzhblue/hustoj
Stars3,7383,7383,738
LanguageJavaScriptJavaScriptJavaScript
Setup difficultyeasymoderatehard
Complexity2/53/54/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

In plain English

WebRTC adapter (also called adapter.js) is a small JavaScript library that smooths over differences in how web browsers implement real-time communication features. WebRTC is the browser technology that powers video calls, voice calls, and peer-to-peer data transfer directly in the browser without any plugins. Different browsers have historically implemented parts of this standard in slightly different ways, which causes code that works in one browser to break in another. Adapter.js sits between your application code and the browser, quietly fixing those inconsistencies so you can write your WebRTC code once and have it work across browsers. The README notes that the bigger prefix differences that existed years ago are mostly resolved, but behavioral differences between browsers still remain, which is why the library continues to be maintained. The library also exposes a small browser detection utility that identifies which browser and version is running, which can be useful for handling any remaining browser-specific quirks in your own code. Installing it is straightforward: add it through npm or Bower, then import it at the top of your JavaScript file. No further configuration is needed beyond that import. Pre-built files are also available for direct download or linking if you prefer not to use a package manager. The library is a JavaScript shim, meaning it modifies browser APIs in place at runtime to bring them into alignment with the current specification. It is available on npm as the webrtc-adapter package and is widely used by developers building video and audio communication features into web applications.

Copy-paste prompts

Prompt 1
I'm building a peer-to-peer video chat app in the browser using WebRTC. Show me how to install and import adapter.js via npm, and explain what cross-browser problems it solves automatically.
Prompt 2
My WebRTC video call works in Chrome but breaks in Firefox. How does adapter.js fix these differences, and what behavioral quirks between browsers does it still handle today?
Prompt 3
Write a simple WebRTC video call example using adapter.js that works in all major browsers, including setting up peer connections, handling media streams, and managing browser compatibility.

Frequently asked questions

What is adapter?

A small JavaScript shim that fixes cross-browser differences in WebRTC so you can write video and audio call code once and have it work across Chrome, Firefox, Safari, and other browsers.

What language is adapter written in?

Mainly JavaScript. The stack also includes JavaScript, WebRTC, npm.

How hard is adapter to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is adapter for?

Mainly developer.

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