JWT Encoder
Encode JWT header and payload locally into a token-like string. Useful for testing format and structure.
JWT Encoder tool
Both header and payload must be valid JSON objects. This tool does not create a real cryptographic signature.
| Metric | Value |
|---|
Privacy: encoding runs locally in your browser. No header, payload, or token data is stored or transmitted.
The tool validates your header and payload as JSON objects, base64url-encodes them, and joins them with a placeholder signature part.
Examples
- Header example: {"alg":"HS256","typ":"JWT"}
- Payload example: {"sub":"123","iat":1710000000}
- Output is useful for format testing, not secure authentication
FAQ
- What does this JWT encoder do?
It base64url-encodes a JSON header and payload into a token-like JWT string for local testing.
- Does it sign the JWT securely?
No. This tool does not generate a real cryptographic signature. It is for local encoding and testing structure only.
- Can I customize the header and payload?
Yes. You can enter any valid JSON objects for both parts.
- Is my data stored?
No. Encoding runs locally in your browser and is not stored or transmitted.