Replay Runtimes

Replay Node

Replay Node is our alpha NodeJS runtime that is able to record and deterministically replay scripts in the cloud.

Replay Node

Basics

When we started Replay, our goal was to make replayable runtimes a reality not just in the browser, but also in backends like NodeJS. Replay Node is currently in an alpha state and built on top of v16. With that said, folks use it today to debug programs as intense as the TypeScript compiler, so if you have a difficult NodeJS bug, feel free to give it a try.

1

Install Replay Node

Install the Replay Node package globally:

Terminal
npm i @replayio/node --global

Record your script

Use replay-node in the same way that you would use node to run your script:

Terminal
replay-node <script>

Upload your replay

Upload your recordings with the Replay CLI:

Terminal
replayio upload

View your replay

The CLI will upload your replays and provide you with a link to view them.

Terminal
The following recording(s) will be uploaded:

 8a5ab266…  test.js    Now  31.0ms  Recorded



Uploaded recordings

 ✔  8a5ab266…  test.js  Now  31.0ms  (uploaded)



View recording at:

https://app.replay.io/recording/8a5ab266-96ec-47d5-a56a-2b49fa2b999b

FAQ

How do I use Replay Node with TypeScript?

Replay Node supports an --exec flag that lets you execute Node scripts like ts-node.

Terminal
replay-node --exec ts-node <script>
Next
Replay CLI