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JWT Decoder
Decode JSON Web Tokens instantly.
JWT Decoder
Decode JSON Web Tokens instantly (Header & Payload).
What is JWT Decoder?
JWT (JSON Web Token) Decoder splits a JWT token into a readable Header and Payload.
How Does It Work?
The tool splits the JWT using the period delimiter, decodes the URL-safe Base64 payload, then parses the resulting JSON.
Common Use Cases
- Authentication debugging - View the contents of an OAuth2 access token.
- API troubleshooting - Inspect the claims inside a JWT payload.
- Learning JWT structure - Understand the JWT standard using example tokens.
- Token expiration check - View the exp claim to see the expiration time.
- Integration testing - Verify the payload returned by an identity provider.
Frequently Asked Questions
Q: Is it safe to decode a JWT?
A: Yes, decoding a JWT does not require a secret key. Only signature verification requires a key.
Q: Why can't my payload be read?
A: Make sure the format is header.payload.signature (3 parts). JWT uses URL-safe Base64 encoding.
Q: Does it verify the signature?
A: No. The tool only decodes the header and payload.