JWT Decoder
Decode and inspect JSON Web Tokens instantly. View header, payload, and expiration status.
What is a JWT?
JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting claims between parties. A JWT consists of three Base64URL-encoded parts separated by dots: a header (algorithm and type), a payload (claims and data), and a signature for verification.
How to use this tool
Paste a JWT token into the input field and it will be instantly decoded. The header and payload sections are displayed as formatted JSON. The tool also checks the expiration claim to tell you if the token is still valid. Note: this tool decodes but does not verify signatures.
Common use cases
Debugging authentication issues in web applications, inspecting token claims and expiration during API development, verifying token structure before sending to backends, and understanding the data encoded in OAuth and OpenID Connect tokens.