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JWT Decoder – Decode JSON Web Tokens Instantly
View JWT header, payload, and signature securely and privately — all processing happens in your browser.
Paste a JWT token above to decode and inspect it
Quick Reference
Common JWT claims and their meanings.
Standard Claims
- iss: Issuer
- sub: Subject
- aud: Audience
- exp: Expiration Time
- iat: Issued At
- nbf: Not Before
Features
- Decode header & payload
- Expand/collapse sections
- Copy individual parts
- Auto-convert timestamps
- Detect expiration
Security Note
This tool decodes JWTs but does NOT validate signatures. All processing is local - tokens never leave your browser.
About JWT
What is JWT?
JSON Web Tokens are a compact, URL-safe way to represent claims between two parties. They consist of three parts: Header, Payload, and Signature.
Security Note
This tool only decodes JWT tokens. It does NOT validate signatures. All processing happens locally in your browser - your tokens never leave your device.
Common Claims
- iss: Issuer
- sub: Subject
- aud: Audience
- exp: Expiration Time
- iat: Issued At
- nbf: Not Before
Features
- Decode header, payload, and signature
- Expand/collapse sections
- Copy individual sections
- Auto-convert timestamps to readable dates
- Detect expired tokens