JSON Formatting & JWT Decoding: A Developer's Essential Guide

JSON: The Universal Data Format

JSON (JavaScript Object Notation) is the lingua franca of APIs. Debugging malformed JSON — missing commas, unclosed brackets, encoding issues — is a daily developer task. A good formatter with syntax highlighting makes this painless.

JWT Token Decoding

JSON Web Tokens (JWTs) encode claims as base64-encoded JSON. Decoding them reveals the header (algorithm), payload (user data, permissions, expiration), and signature. Critical for debugging auth flows.

Common JWT Claims

• sub — Subject (user ID)
• exp — Expiration timestamp
• iat — Issued-at timestamp
• iss — Issuer
• aud — Audience

Debug Your Data

Use our JSON & JWT Debugger — paste JSON to format/validate, or a JWT to decode. Syntax highlighting, error messages, and beautiful output.