Base64 in JavaScript: btoa, atob, and Buffer Explained
Encode and decode Base64 in JavaScript using btoa/atob in browsers and Buffer in Node.js. Covers Unicode gotchas and URL-safe Base64 patterns.
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Tags: encoding, javascript, base64
Base64 in JavaScript: btoa, atob, and Buffer Explained JavaScript has three different Base64 APIs depending on where your code runs: / in browsers, in Node.js, and -based approaches for handling Unicode correctly. This guide covers all three, explains why breaks on non-ASCII strings, and shows you the right pattern for each environment. Node.js: Buffer In Node.js, the idiomatic way to handle Base64 is with the class. creates a buffer from the string using the given encoding. converts the buffer to a string using the target encoding. Using in either position handles the conversion. Encoding binary files in Node.js Streaming Base64 encoding in Node.js For large files, use streams to avoid loading everything into memory: --- Base64URL (base64url encoding) Standard Base64 uses and , which are…
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