JWT Decoder & Inspector
Decode JSON Web Tokens to view the header, payload, and signature. Debug authentication issues instantly.
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Debug JWT Tokens Instantly
JSON Web Tokens (JWTs) are the standard for authentication in modern web applications. When debugging auth issues, you need to quickly inspect the token's contents to understand what's happening.
Our JWT decoder parses any JWT and shows you the header, payload, and signature in a readable format. No server-side processing means your tokens stay private.
JWT Inspection Features
Everything for JWT debugging
Header Decoding
View the algorithm (alg) and token type (typ) from the JWT header.
Payload Inspection
See all claims including iss, sub, exp, iat, and custom claims in formatted JSON.
Expiration Check
Instantly see if the token is expired and when it was issued.
Signature Display
View the signature portion (note: verification requires the secret key).
How to Decode JWT
Paste and inspect
Paste Token
Paste your JWT token in the input field.
View Parts
See the decoded header and payload instantly.
Inspect Claims
Review all claims and check expiration status.