How to Check React App Version?

Check react app version; In this easy tutorial, i will show you simple ways to check the version of React App using using command line, package.json & app.js.

React. js is an open-source JavaScript library that is used for building user interfaces specifically for single-page applications. React allows developers to create large web applications that can change data, without reloading the page. The main purpose of React is to be fast, scalable, and simple.

How to Check React App Version

• 1 – To Check React Version using directly visiting the package.json
• 2 – To Check React Version by visiting the react.development.js
• 3 – To Check React Version using App.js
• 4 – To Check React Version using Command Line

1 – To Check React Version using directly visiting the package.json

The first method is very easy. For this, you just have to open the package.json file. And that you can see the version of your React app:

{
  ...
  ...
  ...
  "name": "react-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-scripts": "3.4.1"
  },
  ...
  ...
  ...
}

2 – To Check React Version by visiting the react.development.js

The second method is also similar to the first method is very easy. For this you just have to open react.development.js file. Which you will find inside node_modules/react/cjs/ directory. And you can check the version of your react app here:

/** @license React v16.13.1
 * react.development.js
 *
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

3 – To Check React Version using App.js

The third method is a little different. In this you have to open app.jsfile. Which you will find inside the Src directory. And then you have to add the following code to your app.js file:

import React from 'react'
function App() {
  return (
    <div className="App">
        Here is the Latest React version: <strong>{React.version}</strong>
    </div>
  );
}
export default App;

After this, you have to go to the terminal and execute the command given below. Which will start your React JS app:

npm start

4 – To Check React Version using Command Line

The fourth way is very simple. Only you have to go to terminal and visit your react app by using cd /path/your_react_name command.

And when you will be in your react app directory on the terminal. So you execute the command given below. With this you can check the version of your React app:

npm view react version

Now you will see the version of React app installed on your terminal.

What is react version lists?

Checkout the react all versions list:

Version	Release Date	Changes
0.3.0	29 May 2013	Initial Public Release
0.4.0	20 July 2013	Support for comment nodes <div>{/* */}</div>, Improved server-side rendering APIs, Removed React.autoBind, Support for the key prop, Improvements to forms, Fixed bugs.
0.5.0	20 October 2013	Improve Memory usage, Support for Selection and Composition events, Support for getInitialState and getDefaultProps in mixins, Added React.version and React.isValidClass, Improved compatibility for Windows.
0.8.0	20 December 2013	Added support for rows & cols, defer & async, loop for <audio> & <video>, autoCorrect attributes. Added onContextMenu events, Upgraded jstransform and esprima-fb tools, Upgraded browserify.
0.9.0	20 February 2014	Added support for crossOrigin, download and hrefLang, mediaGroup and muted, sandbox, seamless, and srcDoc, scope attributes, Added any, arrayOf, component, oneOfType, renderable, shape to React.PropTypes, Added support for onMouseOver and onMouseOut event, Added support for onLoad and onError on <img> elements.
0.10.0	21 March 2014	Added support for srcSet and textAnchor attributes, add update function for immutable data, Ensure all void elements don’t insert a closing tag.
0.11.0	17 July 2014	Improved SVG support, Normalized e.view event, Update $apply command, Added support for namespaces, Added new transformWithDetails API, includes pre-built packages under dist/, MyComponent() now returns a descriptor, not an instance.
0.12.0	21 November 2014	Added new features Spread operator ({…}) introduced to deprecate this.transferPropsTo, Added support for acceptCharset, classID, manifest HTML attributes, React.addons.batchedUpdates added to API, @jsx React.DOM no longer required, Fixed issues with CSS Transitions.
0.13.0	10 March 2015	Deprecated patterns that warned in 0.12 no longer work, ref resolution order has changed, Removed properties this._pendingState and this._rootNodeID, Support ES6 classes, Added API React.findDOMNode(component), Support for iterators and immutable-js sequences, Added new features React.addons.createFragment, deprecated React.addons.classSet.
0.14.1	29 October 2015	Added support for srcLang, default, kind attributes, and color attribute, Ensured legacy .props access on DOM nodes, Fixed scryRenderedDOMComponentsWithClass, Added react-dom.js.
15.0.0	7 April 2016	Initial render now uses document.createElement instead of generating HTML, No more extra <span>s, Improved SVG support, ReactPerf.getLastMeasurements() is opaque, New deprecations introduced with a warning, Fixed multiple small memory leaks, React DOM now supports the cite and profile HTML attributes and cssFloat, gridRow and gridColumn CSS properties.
15.1.0	20 May 2016	Fix a batching bug, Ensure use of the latest object-assign, Fix regression, Remove use of merge utility, Renamed some modules.
15.2.0	1 July 2016	Include component stack information, Stop validating props at mount time, Add React.PropTypes.symbol, Add onLoad handling to <link> and onError handling to <source> element, Add isRunning() API, Fix performance regression.
15.3.0	30 July 2016	Add React.PureComponent, Fix issue with nested server rendering, Add xmlns, xmlnsXlink to support SVG attributes and referrerPolicy to HTML attributes, updates React Perf Add-on, Fixed issue with ref.
15.3.1	19 August 2016	Improve performance of development builds, Cleanup internal hooks, Upgrade fbjs, Improve startup time of React, Fix memory leak in server rendering, fix React Test Renderer, Change trackedTouchCount invariant into a console.error.
15.4.0	16 November 2016	React package and browser build no longer includes React DOM, Improved development performance, Fixed occasional test failures, update batchedUpdates API, React Perf, and ReactTestRenderer.create().
15.4.1	23 November 2016	Restructure variable assignment, Fixed event handling, Fixed compatibility of browser build with AMD environments.
15.4.2	6 January 2017	Fixed build issues, Added missing package dependencies, Improved error messages.
15.5.0	7 April 2017	Added react-dom/test-utils, Removed peerDependencies, Fixed issue with Closure Compiler, Added a deprecation warning for React.createClass and React.PropTypes, Fixed Chrome bug.
15.5.4	11 April 2017	Fix compatibility with Enzyme by exposing batchedUpdates on shallow renderer, Update version of prop-types, Fix react-addons-create-fragment package to include loose-envify transform.
15.6.0	13 June 2017	Add support for CSS variables in style attribute and Grid style properties, Fix AMD support for addons depending on react, Remove unnecessary dependency, Add a deprecation warning for React.createClass and React.DOM factory helpers.
16.0.0	26 September 2017	Improved error handling with introduction of “error boundaries”, React DOM allows passing non-standard attributes, Minor changes to setState behavior, remove react-with-addons.js build, Add React.createClass as create-react-class, React.PropTypes as prop-types, React.DOM as react-dom-factories, changes to the behavior of scheduling and lifecycle methods.
16.1.0	9 November 2017	Discontinuing Bower Releases, Fix an accidental extra global variable in the UMD builds, Fix onMouseEnter and onMouseLeave firing, Fix <textarea> placeholder, Remove unused code, Add a missing package.json dependency, Add support for React DevTools.
16.3.0	29 March 2018	Add a new officially supported context API, Add new packagePrevent an infinite loop when attempting to render portals with SSR, Fix an issue with this.state, Fix an IE/Edge issue.
16.3.1	3 April 2018	Prefix private API, Fix performance regression and error handling bugs in development mode, Add peer dependency, Fix a false positive warning in IE11 when using Fragment.
16.3.2	16 April 2018	Fix an IE crash, Fix labels in User Timing measurements, Add a UMD build, Improve performance of unstable_observedBits API with nesting.
16.4.0	24 May 2018	Add support for Pointer Events specification, Add the ability to specify propTypes, Fix reading context, Fix the getDerivedStateFromProps() support, Fix a testInstance.parent crash, Add React.unstable_Profiler component for measuring performance, Change internal event names.
16.5.0	5 September 2018	Add support for React DevTools Profiler, Handle errors in more edge cases gracefully, Add react-dom/profiling, Add onAuxClick event for browsers, Add movementX and movementY fields to mouse events, Add tangentialPressure and twist fields to pointer event.
16.6.0	23 October 2018	Add support for contextType, Support priority levels, continuations, and wrapped callbacks, Improve the fallback mechanism, Fix gray overlay on iOS Safari, Add React.lazy() for code splitting components.
16.7.0	20 December 2018	Fix performance of React.lazy for lazily-loaded components, Clear fields on unmount to avoid memory leaks, Fix bug with SSR, Fix a performance regression.
16.8.0	6 February 2019	Add Hooks, Add ReactTestRenderer.act() and ReactTestUtils.act() for batching updates, Support synchronous thenables passed to React.lazy(), Improve useReducer Hook lazy initialization API.
16.8.6	27 March 2019	Fix an incorrect bailout in useReducer(), Fix iframe warnings in Safari DevTools, Warn if contextType is set to Context.Consumer instead of Context, Warn if contextType is set to invalid values.
16.9.0	9 August 2019	Add <React.Profiler> API for gathering performance measurements programmatically. Remove unstable_ConcurrentMode in favor of unstable_createRoot
16.10.0	27 September 2019	Fix edge case where a hook update wasn’t being memoized. Fix heuristic for determining when to hydrate, so we don’t incorrectly hydrate during an update. Clear additional fiber fields during unmount to save memory. Fix bug with required text fields in Firefox. Prefer Object.is instead of inline polyfill, when available. Fix bug when mixing Suspense and error handling.
16.10.1	28 September 2019	Fix regression in Next.js apps by allowing Suspense mismatch during hydration to silently proceed
16.10.2	3 October 2019	Fix regression in react-native-web by restoring order of arguments in event plugin extractors
16.11.0	22 October 2019	Fix mouseenter handlers from firing twice inside nested React containers. Remove unstable_createRoot and unstable_createSyncRoot experimental APIs. (These are available in the Experimental channel as createRoot and createSyncRoot.)
16.12.0	14 November 2019	React DOM – Fix passive effects (useEffect) not being fired in a multi-root app.React Is – Fix lazy and memo types considered elements instead of components
16.13.0	26 February 2020	Features added in React Concurrent mode.Fix regressions in React core library and React Dom.
16.13.1	19 March 2020	Fix bug in legacy mode Suspense.Revert warning for cross-component updates that happen inside class render lifecycles
16.14.0	14 October 2020	Add support for the new JSX transform.
17.0.0	20 October 2020	“No New Features” enables gradual React updates from older versions.Add new JSX Transform, Changes to Event Delegation
17.0.1	22 October 2020	React DOM – Fixes a crash in IE11

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