JWT Decoder & Inspector
Decode and inspect JSON Web Tokens. View the header, payload, and check expiration status without any external libraries.
About JWT Decoder & Inspector
Punchbit JWT Decoder is a free browser-based tool for decoding and inspecting JSON Web Tokens. Paste any JWT to instantly view the decoded header and payload as formatted JSON. The tool automatically checks token expiration status and displays all claims. No data is sent to any server.
Key Features
- -Instantly decode JWT header and payload
- -Automatic expiration status checking
- -Formatted JSON display of all claims
- -Supports all standard JWT algorithms
- -No data sent to servers
Common Use Cases
- -Debugging authentication issues
- -Inspecting API token claims and permissions
- -Verifying token expiration times
- -Understanding JWT structure for learning
- -Troubleshooting OAuth and SSO flows
JWT Decoder & Inspector is a free tool by Punchbit. Available at punchbit.com/tools/jwt-decoder. No signup required.
Frequently Asked Questions
›How do I decode a JWT token?
Paste the full JWT (the three dot-separated parts) into the input field. The header and payload are decoded and displayed as formatted JSON instantly.
›Can this verify JWT signatures?
This tool decodes and inspects JWTs — it shows the header (algorithm, type) and payload (claims, expiration). Signature verification requires the signing key, which should never be entered in a browser tool.
›How do I check if a JWT is expired?
The tool automatically reads the 'exp' claim and shows whether the token is expired or still valid, along with the exact expiration date and time.