Developer
JWT decoder
Decode a JSON Web Token’s header and payload and check its expiry.
Free to use · Runs in your browser · No signup
This tool works in your browser. Enable JavaScript to select files and create your download.
How to use JWT decoder
- Paste the JSON Web Token.
- Read the algorithm, issued and expiry times, and the decoded claims.
- Use the result for debugging only.
What you need
Nothing to upload. Type or paste directly into the tool; results update as you go.
Your result
The decoded header, payload, and expiry status.
Before you start
Decoding does not verify the signature, so never trust a token’s contents on that basis. The token stays in your browser; avoid pasting production secrets into any website you do not trust.
Questions about JWT decoder
How do I use JWT decoder?
Paste the JSON Web Token. Read the algorithm, issued and expiry times, and the decoded claims. Use the result for debugging only.
What does JWT decoder produce?
The decoded header, payload, and expiry status.
What should I check before using JWT decoder?
Decoding does not verify the signature, so never trust a token’s contents on that basis. The token stays in your browser; avoid pasting production secrets into any website you do not trust.
Is what I type sent anywhere?
No. The calculation runs in your browser, and the text or numbers you enter are not uploaded or stored.