Open source JavaScript library to record and replay the web

In plain words

rrweb is an open source JavaScript library that records and replays web interactions. Developers use it to capture user sessions and replay them for debugging, testing, or documentation purposes. The library works by recording DOM changes, user inputs, and network activity, then recreates those interactions in a browser. It's useful for identifying bugs, understanding user behavior, and creating reproducible test cases without manual recreation.

written from the facts on this page · September 2026

From the sources

rrweb adds session replay to your product. Add one snippet, and rrweb handles everything from recording sessions to replaying them in your product, under your brand. Add replay to the product you already run, or build an entire product on the open recorder. These are the use cases teams already ship on rrweb. Attach the session behind every error to the observability view you build. One timestamped stream of DOM, clicks, console, and network. Connect funnels, friction signals, and behavior trends to the sessions that explain them, inside analytics you own. Record what a browser agent actually saw. Replay a failed run as DOM-level evidence beside the model and tool trace. Ship a reporter…from rrweb.io

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  rrweb2018 · rrweb.com · ▲125

  Open source JS library to record and replay the web

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  rrweb 1.02021 · rrweb.com · ▲120

  The most popular open-source session replay library

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  Hi HN, I'm one of the founders of s2.dev. RePlaya (https://github.com/s2-streamstore/replaya) is a self-hosted browser session replay tool using rrweb (https://github.com/rrweb-io/rrweb). It occurred to me that a durable stream per session would be a much neater architectural foundation for much of what you'd want from such a tool. As a unique feature, it also made live tailing straightforward because the player can read from the same stream the recorder is appending to. The alternative architecture is likely an ingest firehose which is then indexed,…

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