JWT Decoder (JSON Web Token, Free, Secure)
Decode and inspect JWT tokens without verification.
0 / 2,000 characters
Free tier: 2,000 characters.
Note: This tool only decodes JWTs. It does not verify signatures. Never paste sensitive tokens from production systems.
Why Use a JWT Decoder?
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. JWTs contain three Base64-encoded parts separated by dots: header.payload.signature. The header describes the algorithm, the payload contains claims (user ID, roles, expiration), and the signature verifies authenticity.
Common Use Cases
- API authentication: Inspect JWT tokens from Authorization: Bearer headers
- Debugging auth issues: Check token expiration, user IDs, or roles without backend access
- OAuth/OIDC: Decode ID tokens from Auth0, Okta, or Google OAuth
- Session storage: Read JWT claims stored in cookies or localStorage
- Access control: Verify which permissions/roles a JWT grants
Why This Tool?
- 100% client-side: Your tokens never touch our servers—everything runs in your browser
- Instant decoding: Base64-decode header and payload in milliseconds
- No verification: Read token contents without needing secret keys or signatures
- Free forever: Unlimited JWT decoding with no rate limits
Pro tip: After decoding, use our JSON Formatter to beautify the payload for easier reading. Never paste production tokens with real user data.