JWT Decoder
Decode and inspect JSON Web Token headers, payloads, and signatures.
What is the JWT Decoder Tool?
Our free online JWT Decoder lets you instantly inspect and decode JSON Web Tokens (JWT). It separates and decodes the token's header, payload claims, and signature, all client-side inside your browser.
How to Use JWT Decoder
- 1Paste your complete JWT token string into the input editor.
- 2The tool parses the token structure and displays decoded JSON configurations.
- 3Inspect the decoded header and payload claims sections instantly.
Common Use Cases
- •Verifying expiration times and issuer configurations in security tokens.
- •Inspecting session claims and roles assigned to users during development.
- •Debugging authentication issues by checking raw token structures.
🔒 Privacy & Processing Notice
This tool processes all data entirely in your browser using client-side JavaScript. Your input is never uploaded to any server, ensuring 100% privacy and confidentiality. No data is stored, logged, or transmitted.
Frequently Asked Questions
What does JWT stand for?
JWT stands for JSON Web Token, a standard format used to securely transmit information between parties as a JSON object.
Does a JWT decoder verify the token's signature?
This tool decodes and displays header and payload structures. Security signature verification requires matching cryptographic keys on the backend.
Is it safe to decode my JWT tokens here?
Yes, our decoder runs 100% locally in your browser. Your authentication tokens are never sent to external servers.
Is JWT Decoder free to use?
Yes, JWT Decoder is 100% free with no signup required.
Is my data safe?
All processing happens in your browser. Your data never leaves your device.
Does it work offline?
Once the page loads, JWT Decoder works entirely client-side.