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JWT Token Decoder
Inspect JWT header and payload in readable JSON, plus claim timestamps for iat, exp, and nbf. Decoding happens only in your browser.
Header
{
"alg": "HS256",
"typ": "JWT"
}Payload
{
"sub": "1234567890",
"name": "Daliy Tools",
"iat": 1751333000,
"exp": 1909094400
}Token Details
Signature length: 9 chars
IAT: 7/1/2025, 1:23:20 AM (2025-07-01T01:23:20.000Z)
EXP: 7/1/2030, 12:00:00 AM (2030-07-01T00:00:00.000Z)
How to Inspect a JWT Token
01
Paste the Token
Enter a JSON Web Token into the decoder field.
02
Inspect Header and Payload
Review the decoded algorithm, claims, timestamps, and other fields.
03
Check the Context
Use the claims to understand the token, but verify it with the issuing service.
Local JWT Segment Decoding
A JWT contains Base64URL-encoded header and payload segments. The decoder parses those segments into readable JSON without needing the signing secret.
Decoding does not validate a signature. Tokens stay in the browser and are not sent to a server.
Frequently Asked Questions
Does decoding a JWT verify it?
No. Decoding only reads the token contents. Signature verification must happen with the issuer's trusted key and rules.
Can I decode an expired token?
Yes. The tool can display its expiration claim, but an expired token should not be treated as valid.
Should I paste production tokens here?
Use care with sensitive credentials. Although processing is local, avoid exposing active tokens unnecessarily.
What parts of a JWT are shown?
The decoder displays the header, payload claims, and readable timestamp values when present.
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