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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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