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
- Ability to Reconnect
- Web Performance Metrics
- Tutorial Walkthrough
Reactime 22.0 heralds significant enhancements, addressing core performance issues and fortifying the overall application's stability and reliability. In our pursuit of consistent evolution, we've updated outdated packages and transitioned state management to Redux Toolkit. This strategic shift not only modernizes our tech stack but also ensures our application is positioned for easier maintenance and scalability in the future. Complementing these upgrades, this release also mends various bugs. The debut of features like the reconnection button, a status icon, and the integration of key web metrics – Cumulative Layout Shift (CLS) and Interaction To Next Paint (INP) – amplifies its functionality and offers users a more refined experience.
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.
By default this only our app only injects content scripts into localhost.
If you would like it to run on more websites please go to https://github.com/open-source-labs/reactime. Fork and clone the repository and change
"matches": ["http://localhost/*"] to "matches": ["<all_urls>"] in the manifest.json src\extension\build\manifest.json