JWT Decoder

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. A JWT consists of three Base64URL-encoded parts separated by dots: the Header (algorithm and token type), the Payload (claims and data), and the Signature (for verification). This tool decodes the Header and Payload for inspection without verifying the signature — useful for debugging and understanding token contents.

• Inspect the contents of JWT access tokens to debug authentication issues in your application
• Verify token claims such as expiration time (exp), issued-at (iat), and subject (sub)
• Examine token metadata like the signing algorithm (HS256, RS256) declared in the JWT header

1. 1Paste your JWT token into the input field — the tool auto-decodes it on the fly
2. 2Review the color-coded Header and Payload sections to inspect the decoded JSON data
3. 3Copy individual values as needed — all decoding happens locally in your browser