Key capabilities
- Header / Payload decode
- Expiry status
- Claim explanations
- Multi-algorithm verification
JWT Decoder
Split JWT Header, Payload, and Signature locally, explain common claims and expiry, and verify HMAC, RSA, and ECDSA signatures.
JWT Decoder
JWT decoding and signature checks run locally in your browser. Tokens and secrets are not uploaded.
JWT Token
Decoded
Not verifiedSupports local HMAC verification for HS256, HS384, and HS512
Algorithm
HS256
Type
JWT
Claims
8
Expiry
Expired
Security diagnostics
3
Algorithm can be verifiedPassed
The current algorithm HS256 can be verified locally in the browser.
Token expiredRisk
exp is earlier than the current time, so servers usually should reject it.
Signature not verifiedInfo
Decoded content is not automatically trusted. Enter a secret or public key to verify the signature.
Header
{
"alg": "HS256",
"typ": "JWT"
}Payload
{
"sub": "1234567890",
"name": "ToolRen User",
"iss": "https://tool.ren",
"aud": "toolren-workspace",
"scope": "tools:read tools:export",
"iat": 1783382400,
"nbf": 1783382400,
"exp": 1786060800
}Common claims
ExpiredIssuer
isshttps://tool.ren
Subject
sub1234567890
Audience
audtoolren-workspace
Scope
scopetools:read tools:export
Issued at
iatJul 7, 2026, 12:00:00 AM
Not before
nbfJul 7, 2026, 12:00:00 AM
Expires at
expAug 7, 2026, 12:00:00 AM
Raw segments
Header
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9Payload
eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IlRvb2xSZW4gVXNlciIsImlzcyI6Imh0dHBzOi8vdG9vbC5yZW4iLCJhdWQiOiJ0b29scmVuLXdvcmtzcGFjZSIsInNjb3BlIjoidG9vbHM6cmVhZCB0b29sczpleHBvcnQiLCJpYXQiOjE3ODMzODI0MDAsIm5iZiI6MTc4MzM4MjQwMCwiZXhwIjoxNzg2MDYwODAwfQSignature
h0lls_HtvHKOiwtMJ5Cwmi1AUc9mIFH8uLN9WJ763HQAbout JWT Decoder
Decode, inspect, and verify JSON Web Tokens. Split JWT Header, Payload, and Signature locally, explain common claims and expiry, and verify HMAC, RSA, and ECDSA signatures. The core workflow is designed to run in your current browser.
Useful for
- Debug API authentication failures
- Check sessions and expiry times
- Review test environment tokens
Frequently asked questions
Is JWT Decoder free to use online?
Yes. JWT Decoder opens in a modern browser and does not require desktop software installation.
What is JWT Decoder useful for?
Common use cases include Debug API authentication failures; Check sessions and expiry times.
Is my input or file uploaded?
The core processing workflow is designed to run locally in the browser. Key capabilities include Header / Payload decode, Expiry status, Claim explanations; account, comments, and anonymous analytics may still create normal site requests.
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