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Good day. I have app created via create-react-app and I am trying to create decoder for covid greenpass. I have an issue with base45 decoding. It causes error like this:

base45-js.js:60 Uncaught ReferenceError: Buffer is not defined
    at Object.decode (base45-js.js:60:1)
    at CovidPass (CovidPass.js:10:1)
    at renderWithHooks (react-dom.development.js:14985:1)
    at mountIndeterminateComponent (react-dom.development.js:17811:1)
    at beginWork (react-dom.development.js:19049:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:3945:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:3994:1)
    at invokeGuardedCallback (react-dom.development.js:4056:1)
    at beginWork$1 (react-dom.development.js:23964:1)
    at performUnitOfWork (react-dom.development.js:22776:1)

Here's code. Any ideas how to fix this?

import React from 'react';
import cbor from 'cbor-web';
import base45 from 'base45';
import pako from 'pako';   

const CovidPass = () => {
    const decodedBase45 = base45.decode('I2B-KEP2');
    console.log(decodedBase45);

    return (
        <p>{decodedBase45}</p>
    );
}

export default CovidPass;

Good day. I have app created via create-react-app and I am trying to create decoder for covid greenpass. I have an issue with base45 decoding. It causes error like this:

base45-js.js:60 Uncaught ReferenceError: Buffer is not defined
    at Object.decode (base45-js.js:60:1)
    at CovidPass (CovidPass.js:10:1)
    at renderWithHooks (react-dom.development.js:14985:1)
    at mountIndeterminateComponent (react-dom.development.js:17811:1)
    at beginWork (react-dom.development.js:19049:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:3945:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:3994:1)
    at invokeGuardedCallback (react-dom.development.js:4056:1)
    at beginWork$1 (react-dom.development.js:23964:1)
    at performUnitOfWork (react-dom.development.js:22776:1)

Here's code. Any ideas how to fix this?

import React from 'react';
import cbor from 'cbor-web';
import base45 from 'base45';
import pako from 'pako';   

const CovidPass = () => {
    const decodedBase45 = base45.decode('I2B-KEP2');
    console.log(decodedBase45);

    return (
        <p>{decodedBase45}</p>
    );
}

export default CovidPass;
  • javascript
  • reactjs
  • base45
Share Improve this question asked Jan 18, 2022 at 12:45 szemegszemeg 511 silver badge8 bronze badges
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2 Answers 2

Reset to default 4

This is from an old answer here:

Install the browser buffer package:

npm install --save buffer

Import it and use it directly, example:

import {Buffer} from 'buffer';
Buffer.from('anything','base64');

ref:
Uncaught ReferenceError: Buffer is not defined in React

I solved this by downgrading "react-scripts": "5.0.0" to "react-scripts": "4.0.3" in package.json, and running npm install. But I think there's much better solution.

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