JWT Decoder Online
Decode JSON Web Tokens online for free. Paste a JWT to instantly view its header, payload and claims — including expiration status.
Your token is decoded directly in your browser and is never uploaded to our servers. This tool decodes a JWT — it does not verify the signature, since that requires the secret or private key.
What is a JWT Decoder?
A JSON Web Token (JWT) is a compact, three-part token made up of a Base64URL-encoded header, payload and signature, separated by dots. A JWT decoder reverses the encoding on the header and payload so you can read the algorithm, token type and claims — like the subject, issued-at time and expiration — without needing the secret key.
Use this free JWT token decoder to inspect claims while debugging authentication flows, check when a token was issued or will expire, or verify an API is sending the fields your application expects. It decodes the token; it does not and cannot verify the signature without the secret or private key used to sign it.
How to Decode a JWT Online
Paste your token
Paste the full JWT — header.payload.signature — into the field above.
Click Decode Token
Click Decode Token to split and decode all three parts.
Review header & payload
See the decoded header and payload as readable JSON, plus expiration status.
Check the signature
The raw signature is shown for reference — verifying it requires the secret or private key.
JWT Decoder Features
Encoded Token & Decoded Payload
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{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}Why Use This JWT Decoding Tool?
Debugging authentication issues usually means answering one question fast: what's actually inside this token? Manually Base64URL-decoding a JWT by hand is tedious and error-prone. This decoder does it instantly, formats the claims for readability, and flags whether the token has expired — all without sending your token anywhere.
Frequently Asked Questions
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