jwt decoder

inspect tokens
🔐 no server uploads ⚡ instant decode 📋 claim validation
debug & inspect

See what's inside your tokens

Paste a JWT below. Everything happens locally — your tokens never leave this page.

JSON Web Token header.payload.signature
HEADER algorithm & type 
Waiting for token...
PAYLOAD claims & data 
Waiting for token...
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about JSON Web Tokens

JSON Web Tokens (JWT) consist of three parts: header, payload, and signature, each base64url-encoded and separated by dots. The header typically contains the algorithm (alg) and token type (typ). The payload contains claims — statements about an entity and additional data. The signature verifies the token hasn't been tampered with.

This tool decodes JWTs entirely in your browser. No data is sent to any server. Common claims like exp (expiration), iat (issued at), and sub (subject) are highlighted for quick inspection.