A Chrome extension that helps debug React applications by memorizing the state of components with every render.
Reactime was nominated for the Productivity Booster award at React Open Source Awards 2020.
Reactime is an open source Chrome developer tool for time travel debugging and performance monitoring in React applications. Reactime enables developers to record snapshots of application state, jump between and inspect state snapshots, and monitor performance metrics such as component render time and render frequency.
- Record Snapshots of Application State
- Import and Export Snapshots of State
- Time-Travel Debugging
- Snapshot Series Comparison
- Component Tree Visualization
- React Router Compatibility
- Component Render Time & Frequency
- Support for Gatsby, Next.js and Remix
- TypeScript Support
- Tutorial Walkthrough
Reactime 21.0 includes several key improvements to improve performance and resolve existing bugs, as well as a revamped UI/UX. We have implemented a functional import/export feature that allows users to download and upload state snapshots. We have also resolved several persistent bugs, including one that would cause the tool to crash and the screen to blackout if left idle for a few minutes. As part of our effort to improve overall performance, we have made changes so Reactime loads and connects to the target app seamlessly upon launch, and sustains a stable connection while in use. Additionally we have updated the UI to be more modern and cohesive. Lastly, we have upgraded Reactime by removing deprecated code and packages, reducing compilation errors.
Why is Reactime telling me that no React application is found?
Reactime initially runs using the dev tools global hook from the Chrome API. It takes time for Chrome to load this. Try refreshing your application a couple times until you see Reactime running.
Why do I need to have React Dev Tools enabled?
Reactime works in tandem with the React Developer Tools to access a React application's Fiber tree; under the hood, Reactime traverses the Fiber tree through the React Developer Tool's global hook, pulling all relevant information needed to display to the developer
There is a black screen instead of the Reactime extension
Try refreshing the application you want to test and refresh the DevTools by clicking the right mouse button “Reload frame”.
I found a bug in Reactime
Reactime is an open source project, and we'd love to hear from you about improving the user experience. Please read the DEVELOPER README in GitHub and create a pull request (or issue) to propose and collaborate on changes to Reactime.