JWT Decoder
Decode JWT header and payload for claim inspection and debugging.
Quick Links
Quick Example
Input: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.signature
Output: Decoded header/payload JSON
Common mistakes
- Using decoded values as trusted data without verification.
- Reusing weak secrets or test keys in real environments.
- Skipping expiry, audience, issuer, or key trust checks.
String Ninja tools run in the browser for practical text, security, and data workflows. For critical production decisions, validate outcomes in controlled pipelines.