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. Reactime supports React apps (now including React Router apps) using stateful components and Hooks, with beta support for Recoil and Context API and frameworks like Gatsby and Next.js. Reactime 15.0 adds a new visualization, allowing users to zone in on individual components of a specific snapshot. Additionally, a number of bug fixes have been implemented. Currently, Reactime supports React apps (now including React Router apps) using stateful components and Hooks, with beta support for Recoil and Context API and frameworks like Gatsby and Next.js. Previously, Reactime 14.0 added the exciting features below: React Router Compatibility Reactime is now compatible with React Router applications! Prior to Reactime 14.0, recording state snapshots as the user navigated across various routes was possible, but time travel debugging was only possible for the current route (i.e. jumping back to a prior state at a different route was not possible). In order to streamline debugging of applications with multiple routes, Reactime 14.0 added functionality that allows the user to time-travel back to different routes, including live updating in the browser to reflect the state of their application at that previously visited route. Classifying State Snapshots by Route The list of state snapshots in the Reactime dashboard is now classified by route to give the developer visual cues of the snapshot-route relationship and make time travel debugging of various routes easier. Filtering Performance Metrics by Route The Reactime dashboard includes a stacked bar graph showing render times for each component, with a separate bar stack for each snapshot. With Reactime 14.0, this composite bar graph can now be filtered by route to allow the developer to review detailed performance data by route. Features: - Component Tree Visualization - Record Snapshots of Application State - Time-Travel Debugging - Snapshot Series Comparison - Component Render Time & Frequency - Support for Gatsby & Next.js - Beta Support for TypeScript - Tutorial Walkthrough Troubleshooting: 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. 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 really appreciate your help with improving user experience. Please create a pull request (or issue) to propose and collaborate on changes to a repository. Further Reading: https://medium.com/better-programming/time-traveling-state-with-reactime-6-0-53fdc3ae2a20 https://medium.com/@aquinojardim/react-fiber-reactime-4-0-f200f02e7fa8 https://medium.com/@yujinkay/meet-reactime-a-time-traveling-state-debugger-for-react-24f0fce96802 https://itnext.io/deep-in-the-weeds-with-reactime-concurrent-react-fiberroot-and-browser-history-caching-7ce9d7300abb https://rxlina.medium.com/time-traveling-through-react-state-with-reactime-9-0-371dbdc99319 https://medium.com/@liuedar/what-time-is-it-reactime-fd7267b9eb89 https://medium.com/@christinaor/uncovering-reactime-understanding-react-fiber-redux-compatibility-and-zoning-in-on-components-59f0758e0fa3
- (2022-06-21) Carlos Koulatsis: Useful tool but on the latest update it shows a random number on the browser tabs which is very annoying.
- (2022-04-13) Kris Sorensen: Amazing new split feature!
- (2020-12-09) Ronald Paek: Awesome tool
- (2020-12-08) Dylan Hensel: Great extension for React devs. Highly recommend!
- (2020-12-08) Anthony Magallanes: Such a useful extension!! A must download!
- (2020-12-08) Janis Hernandez Aguilar: Awesome tool
- (2020-10-30) Jiří Špác: it started spamming console logs. Maintainers should definitely add eslint rule for no console logs in the codebase
- (2020-10-22) Taven Shumaker: I've started turning to Reactime over the react dev tools extension for time travel debugging. It works well with my react apps and makes debugging complex issues easier. I would reccomend.
- (2020-10-21) Chandni -: Great Chrome Extension!
- (2020-10-21) Brian Hayashi: This is a great tool, really helps with debugging and the visuals are great!
- (2020-09-17) Jinseon Shin: Super useful tool for React developers. Easy to implement and great visualizer!
- (2020-09-13) Alex Jo: Awesome dev tool, very useful for debugging!
- (2020-09-13) Peter Matthews: Heard about this via the Medium article. Great tool, thanks for sharing
- (2020-09-04) alexander landeros: Very useful tool for React!
- (2020-09-04) Alexander Kim: So useful. Such a great tool.
- (2020-09-04) Joal Kim: What a great dev tool! The best part is definitely the data flow visualization. Really cool, and so fast. I'd recommend.
- (2020-09-04) Connor Rose Delisle: Really helpful, and great coverage for Recoil too!
- (2020-09-03) Michelle Holland: Super useful tool, especially the Recoil data flow visualization. So awesome! Definitely recommend to any React developer.
- (2020-09-03) Justin Choo: Awesome dev tool. Really helped me alot debugging my app!!
- (2020-09-03) Spenser Schwartz: This is a great dev tool! For anyone who uses React, you'll do yourself a favor by checking out this extension.
- (2019-11-22) Krisztian Feher: Unfortunately with our large application using antd, redux, class components and a mixture or hooks the extension does absolutely nothing.
- (2019-08-15) Sophie Nye: What a great idea! Super helpful!
- (2019-08-15) Mooyeong Lee: Great developer tool! I loved how easy it was to implement on my existing codebase
- (2019-08-15) Ryan Dang: Nice devtool for any React developer to manage and view state.
- (2019-08-14) Sungtae Kim: wow this is awesome!! as someone new to react, this is a great debugging tool!
- (2022-05-27, v:11.0.0) Павел Рыжов: After starting extension I see black window
Hello, my problem is after starting extension I see black window or the message about react app is not found, but my app on React and is started in dev mode. What can be a reason? Your extension is really remarkable and I would like to use it!) Please, help me with the problem!)
- (2021-03-10, v:8.0.0) Marcos Cunha Lima: Just after installing it and running a react app, it crashes
Hi After installing it, is shows (in the console): React instrumentation encountered an error: TypeError: Cannot read property 'object' of null and after that: backend.bundle.js:1 Uncaught TypeError: Cannot read property 'object' of null I am using the latest version of React and using serviceWorker.