★ Free Developer Tool
JWT Decoder
Decode a JSON Web Token to read its header, payload and expiry time.
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Runs entirely in your browser. Your files and text are never uploaded to our server.
About this toolJWT Decoder shows what is inside a JSON Web Token: the header, the claims, and when it was issued and expires.
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JWT Decoder shows what is inside a JSON Web Token: the header, the claims, and when it was issued and expires.
Step-by-step guide: JWT Decoder Guide: What Is a JSON Web Token and How to Decode It Safely
More about JWT DecoderHow to use, good to know & FAQ
How to use JWT Decoder
- Paste a JWT.
- Read the decoded header and payload, and the expiry status.
Good to know
- Decoding does not verify the signature. Never trust a token just because it decodes.
Frequently asked questions
Is it safe to paste a real token?
The token never leaves your browser here. Still, treat live tokens like passwords and avoid sharing them.
Does decoding verify the signature?
No. Decoding only reads the token; verification needs the secret or public key.
When to use JWT Decoder
- Inspect claims while debugging authentication
- Check when a token expires
- Verify which algorithm a token uses
- Learn how JWTs are structured
📘 Read the guide: JSON Formatting & Validation: A Beginner’s Guide With Examples