TypeScript - atob / btoa functions equivalents in Node.js

In this article, we would like to show you atob and btoa functions equivalents in TypeSrcipt in Node.js.

Note:

In the presented solution, we use the Buffer class, which is in a global scope in Node.js and does not need to be imported using the require() function.

The only thing you need to do is to install Node.js types for development using:

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npm i --save-dev @types/node

In web browser JavaScript btoa() function is used to convert binary to Base64-encoded ASCII string. btoa function name should be read as "binary to ASCII".

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const toBase64 = (text: string): string => {

  return Buffer.from(text, 'binary').toString('base64');

};

​

console.log(toBase64('This is text...')); // VGhpcyBpcyB0ZXh0Li4u

Output:

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VGhpcyBpcyB0ZXh0Li4u

In web browser JavaScript atob() function is used to convert Base64-encoded ASCII string to binary. atob function name should be read as "ASCII to binary".

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const toBinary = (base64: string): string => {

  return Buffer.from(base64, 'base64').toString('binary');

};

​

console.log(toBinary('VGhpcyBpcyB0ZXh0Li4u')); // This is text...

Output:

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This is text...