How to create React App including Web3 using create-react-app? I am getting Module not found Error. BREAKING CHANGE: webpack < 5 used

Question

I am new to Web3 and I am trying to create a react app integrated with web3. Below are the steps I followed in Ubuntu.

    create-react-app app_name
    cd app_name
    npm i --save web3
    npm start

and everything worked fine, I got the react app home page.

Now, as soon as I put the following line of code in the App.js the app breaks and I get the following long error. (See below, row 5)

import Web3 from "web3";

The error I get is as follows.

Compiled with problems:X

ERROR in ./node_modules/cipher-base/index.js 3:16-43

Module not found: Error: Can't resolve 'stream' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/cipher-base'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "stream": require.resolve("stream-browserify") }'
    - install 'stream-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "stream": false }


ERROR in ./node_modules/eth-lib/lib/bytes.js 9:193-227

Module not found: Error: Can't resolve 'crypto' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/eth-lib/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "crypto": require.resolve("crypto-browserify") }'
    - install 'crypto-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "crypto": false }


ERROR in ./node_modules/ethereumjs-util/dist.browser/account.js 71:31-48

Module not found: Error: Can't resolve 'assert' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/ethereumjs-util/dist.browser'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "assert": require.resolve("assert/") }'
    - install 'assert'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "assert": false }


ERROR in ./node_modules/ethereumjs-util/dist.browser/address.js 14:31-48

Module not found: Error: Can't resolve 'assert' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/ethereumjs-util/dist.browser'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "assert": require.resolve("assert/") }'
    - install 'assert'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "assert": false }


ERROR in ./node_modules/ethereumjs-util/dist.browser/object.js 46:31-48

Module not found: Error: Can't resolve 'assert' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/ethereumjs-util/dist.browser'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "assert": require.resolve("assert/") }'
    - install 'assert'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "assert": false }


ERROR in ./node_modules/web3-eth-accounts/lib/index.js 31:74-91

Module not found: Error: Can't resolve 'crypto' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/web3-eth-accounts/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "crypto": require.resolve("crypto-browserify") }'
    - install 'crypto-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "crypto": false }


ERROR in ./node_modules/web3-eth-accounts/node_modules/eth-lib/lib/bytes.js 7:193-227

Module not found: Error: Can't resolve 'crypto' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/web3-eth-accounts/node_modules/eth-lib/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "crypto": require.resolve("crypto-browserify") }'
    - install 'crypto-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "crypto": false }


ERROR in ./node_modules/web3-providers-http/lib/index.js 30:11-26

Module not found: Error: Can't resolve 'http' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/web3-providers-http/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "http": require.resolve("stream-http") }'
    - install 'stream-http'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "http": false }


ERROR in ./node_modules/web3-providers-http/lib/index.js 32:12-28

Module not found: Error: Can't resolve 'https' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/web3-providers-http/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "https": require.resolve("https-browserify") }'
    - install 'https-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "https": false }


ERROR in ./node_modules/web3-providers-ws/lib/helpers.js 11:12-26

Module not found: Error: Can't resolve 'url' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/web3-providers-ws/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "url": require.resolve("url/") }'
    - install 'url'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "url": false }


ERROR in ./node_modules/xhr2-cookies/dist/xml-http-request.js 37:11-26

Module not found: Error: Can't resolve 'http' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/xhr2-cookies/dist'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "http": require.resolve("stream-http") }'
    - install 'stream-http'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "http": false }


ERROR in ./node_modules/xhr2-cookies/dist/xml-http-request.js 39:12-28

Module not found: Error: Can't resolve 'https' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/xhr2-cookies/dist'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "https": require.resolve("https-browserify") }'
    - install 'https-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "https": false }


ERROR in ./node_modules/xhr2-cookies/dist/xml-http-request.js 41:9-22

Module not found: Error: Can't resolve 'os' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/xhr2-cookies/dist'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "os": require.resolve("os-browserify/browser") }'
    - install 'os-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "os": false }


ERROR in ./node_modules/xhr2-cookies/dist/xml-http-request.js 43:10-24

Module not found: Error: Can't resolve 'url' in '/home/gkv/Stuff/Tutorial/Projects/react/lottery-react-new/node_modules/xhr2-cookies/dist'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "url": require.resolve("url/") }'
    - install 'url'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "url": false }

I tried multiple stackoverflow post but none of them seems to have proper solution.

• Error Library web3 and Webpack in react and angular [closed]
• Module not found: Error: Can't resolve 'stream' in 'C:\dev\jszip-test\node_modules\jszip\lib'
• I am getting this error whilr importing Web3 from web3 in react js 17.0.1.how to fix this

If someone could help that would be great. I have been struggling with this for 5 days.

Answer 1

Run npm install @web3-react/core web3 @web3-react/injected-connector after running npm uninstall web3 and deleting package-lock.json and node_modules

You DO NOT need to downgrade react or install any polyfill plugins for this