JWT Decoder — Inspect Token Header & Payload
Paste a JWT to instantly decode the header and payload. Shows expiry status. Runs entirely in your browser — tokens never leave your device.
Decoded entirely in your browser. Tokens never leave your device.
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Read what’s inside a JWT
Paste a JSON Web Token to decode its header and payload instantly — see claims like sub, iat and exp in plain JSON. Great for debugging auth flows.
Decoding vs verifying
A JWT is base64url-encoded, not encrypted — anyone can read the payload. This tool decodes it; it does not verify the signature against your secret, which is what proves a token is authentic. Never trust a token’s contents without verifying the signature server-side.
Decoding happens in your browser, but avoid pasting live production tokens into any web tool.
How to use the JWT Decoder
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the JWT Decoder above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the JWT Decoder.
How do I decode a JWT?
Paste the token and it decodes the header and payload so you can read the claims.
Does it verify the signature?
It decodes and displays the contents but does not validate the signature against a secret — decoding is not the same as verifying.
Is my token sent to a server?
No — decoding happens in your browser, so the token stays private. Still, avoid pasting production secrets into any tool.
What’s inside a JWT?
Three base64url parts: the header (algorithm), the payload (claims like sub and exp), and the signature.
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