JWT Decoder Online
Paste a JWT token below to decode and inspect
About This Tool
JSON Web Tokens (JWT) are widely used for authentication and authorization in modern web applications. A JWT consists of three Base64-encoded parts — header, payload, and signature — separated by dots. Reading a JWT manually requires Base64 decoding each section, which is tedious and error-prone. Our free online JWT decoder instantly decodes any JWT token and displays the header, payload, and signature in readable JSON format. Inspect token claims, check expiry timestamps, verify the algorithm used, and review any custom claims — all without any server-side processing. Essential for debugging authentication issues, reviewing token contents during development, or auditing JWT claims in security reviews. Works entirely in your browser — your tokens never leave your device.
How to Use
- Paste your JWT token into the input area above
- The token is instantly decoded — no button needed
- Inspect the header, payload and claims in the output below