Base64 in TypeScript: btoa, Buffer, Type Safety
Encode and decode Base64 in TypeScript with full type safety. Covers browser btoa/atob, Node.js Buffer, and shared utility functions for both environments.
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Tags: encoding, typescript, base64
Base64 in TypeScript: Type-Safe Encoding with btoa and Buffer TypeScript doesn't add a Base64 API beyond what JavaScript provides — but it does let you enforce type safety around Base64 strings, which prevents a surprising number of bugs. This guide covers the browser and Node.js APIs, type utilities for Base64 strings, encoding binary data from typed arrays, and Deno compatibility. --- Browser vs. Node.js: what's available where | API | Browser | Node.js 18+ | Deno | |---|---|---|---| | / | Yes | Yes | Yes | | | No | Yes | Partial (polyfill) | | / | Yes | Yes | Yes | | (SubtleCrypto) | Yes | Yes | Yes | For code that must run in both environments, use / with for Unicode safety. For Node.js-only code, is more ergonomic. --- Browser: btoa and atob with proper Unicode handling only handles…
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