JWT Encoder/Decoder
Note: All processing is done entirely in your browser. Your data is never uploaded to any server, ensuring complete privacy and security.
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About JWT Encoder/Decoder
JWT (JSON Web Token) is a compact, URL-safe means of representing claims between two parties. Our JWT Encoder/Decoder tool helps you encode, decode, and validate JWTs, allowing you to inspect header and payload data, verify signatures, and generate new tokens. This tool is particularly useful for developers working with authentication systems, API security, or any application that uses JWTs for secure data transmission.
Frequently Asked Questions
How does the JWT Encoder/Decoder work?
Our tool allows you to both encode and decode JWTs. For encoding, you can input custom header and payload data, along with a secret key to generate a signed JWT. For decoding, simply paste a JWT and the tool will separate and display its header, payload, and verify its signature if a secret key is provided.
What JWT operations are supported?
The tool supports all standard JWT operations including: encoding new tokens with custom claims, decoding existing tokens to inspect their contents, verifying token signatures with secret keys, and validating token structure and claims. It supports both HS256 and RS256 signing algorithms.
Can I customize JWT claims and headers?
Yes, you can add any standard or custom claims to your JWT payload, including 'exp' (expiration time), 'iat' (issued at), 'sub' (subject), and others. You can also customize the header to specify different algorithms or token types. The tool validates the format of standard claims to ensure they're properly formatted.
Is my JWT data secure when using this tool?
Yes, all processing is done entirely in your browser. Your JWTs and secret keys are never uploaded to any server, ensuring complete privacy and security. We have no access to your sensitive data at any point during the encoding or decoding process.
Can I debug JWT-related issues?
Yes, the tool helps debug common JWT issues by validating token structure, checking signature validity, verifying claim formats, and highlighting any problems it finds. It also shows detailed error messages to help you identify and fix issues with malformed or expired tokens.