JWT Token Decoder
The SolversPro JWT Token Decoder is a free browser-based developer utility that parses and inspects JSON Web Token (JWT) headers, claims, and signatures client-side with zero server uploads.
Encoded Token
Decoded Data
Header (Algorithm & Token Type)
Payload (Data)
Signature
Standard JWT Claims & Header Specifications (RFC 7519)
Registered JSON Web Token claim keys, header parameters, and standard data types.
| Claim / Header | JSON Key | Data Type | Specification Meaning |
|---|---|---|---|
| Algorithm | alg | String (e.g. HS256, RS256) | Cryptographic algorithm used to generate the signature in the header |
| Subject | sub | String | Unique principal identifier (user ID or client ID) |
| Issuer | iss | String / URI | Identity provider or authorization server that issued the token |
| Expiration Time | exp | NumericDate (Seconds) | Unix timestamp beyond which the token is invalid and expired |
| Issued At | iat | NumericDate (Seconds) | Unix timestamp when the token was originally signed |
| Audience | aud | String / String Array | Resource server or API intended to accept the token |
Frequently Asked Questions
Is decoding a JWT safe?
Yes, decoding a JWT only reads the Base64Url encoded public information. It does not modify or validate the token. Since our tool runs entirely in your browser, your token never leaves your device.
Can I edit the JWT payload?
Currently, this tool is meant for decoding and inspecting existing tokens. If you edit the payload, the original signature will become invalid.
Why do I see 'Invalid JWT format'?
A valid JWT must have exactly three parts separated by dots (header.payload.signature) and must be properly Base64Url encoded.
Share & Embed
Paste this snippet into your blog, school portal, or website to embed the live JWT Token Decoder:
<iframe src="https://solverspro.com/developer/jwt-decoder/?embed=1" width="100%" height="620" style="border:1px solid #27272a;border-radius:12px;background:#0a0a0f;" loading="lazy" title="JWT Token Decoder — SolversPro"></iframe> <p style="font-size:12px;margin-top:6px;font-family:sans-serif;">Powered by <a href="https://solverspro.com/developer/jwt-decoder/" target="_blank" rel="noopener">JWT Token Decoder — SolversPro</a></p>
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