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Check if a value is base64 encoded

Written byPhuoc Nguyen

Created

10 Apr, 2021

Last updated

13 Oct, 2021

Category

Validator

JavaScript version

isBase64.js

const isBase64 = (value) =>
    /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/.test(value);

TypeScript version

isBase64.ts

const isBase64 = (value: string): boolean =>
    /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/.test(value);

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Check if a value is base64 encoded

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