JWT Decoder
Decode and inspect JSON Web Tokens
How to use
1. Paste your input or choose a sample.
2. Adjust the options and run the tool.
3. Copy or share the output.
Use Cases
Debugging authentication issues by inspecting JWT claims and expiration times
Verifying that JWT tokens contain the expected user roles and permissions
Checking token expiration (exp) and issued-at (iat) times for session management
Inspecting the signing algorithm in the header to ensure security compliance
Extracting user information from tokens for logging or audit purposes
Comparing tokens from different environments to troubleshoot SSO issues
Common Mistakes
Assuming that decoding a JWT verifies its authenticity - decoding does NOT validate signatures
Storing sensitive data in JWT payloads - they are Base64 encoded, not encrypted
Not checking the 'exp' claim before using token data, leading to use of expired tokens
Ignoring the 'alg' header field - attackers may try 'none' algorithm attacks
Confusing JWT decoding with JWT verification - always verify signatures server-side
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