JWT Parser
Parse and inspect JSON Web Tokens (JWT), view Header, Payload, and Signature.
Security Warning
JWTs contain sensitive info. Do not paste real tokens in insecure environments. This tool runs entirely client-side.
JWT Input
Enter JWT token to parse
JWT Structure
Header
• alg: Signing Algorithm
• typ: Token Type
• kid: Key ID
• Other custom fields
Payload
• iss: Issuer
• sub: Subject
• aud: Audience
• exp: Expiration Time
• iat: Issued At
• nbf: Not Before
• Custom Claims
Signature
• Verifies integrity
• Prevents tampering
• Signed with key
• Base64URL encoded
JWT Format
Header.Payload.Signature Example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9. eyJzdWIiOiIxMjM0NTY3ODkwIn0. 4Adcj3UFYzP5sZK9Sqa3PLjkDyJMj0R6KY8d7YQkV9
• Header & Payload are Base64URL encoded
• Three parts separated by dots (.)
• Signature may be empty (unsecured JWT)