developer Tools
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) without validation.
Runs 100% in your browser — your data never leaves this device
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Buy me a coffeeWhat is JWT Decoder?
JSON Web Tokens (JWT) are a compact, URL-safe way to represent claims between parties. They consist of three parts: header, payload, and signature, separated by dots. This tool lets you decode and inspect any JWT to see its contents without needing the secret key.
How to Use JWT Decoder
1. Paste your JWT token into the input
2. The header and payload are automatically decoded
3. View the claims, expiration time, and other metadata
4. Check if the token is expired
Common Use Cases
- Debugging authentication issues
- Inspecting token claims
- Checking token expiration
- Understanding JWT structure
Frequently Asked Questions
Is this secure?
Yes, decoding happens entirely in your browser. JWTs are not encrypted - they are only signed. The payload is Base64 encoded and can be decoded by anyone.
Can this verify signatures?
No, this tool only decodes. Signature verification requires the secret key which should never be shared publicly.
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