JWTG Calculator
The JWTG Calculator allows developers to generate, verify, and decode JSON Web Tokens quickly and securely for authentication systems.

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About This Tool
The JWTG Calculator is a comprehensive online tool designed for developers, cybersecurity experts, and tech teams. It simplifies the process of creating, verifying, and decoding JSON Web Tokens (JWTs), essential for secure authentication and data exchange in web applications. Users can input custom headers, claims, and secrets to generate signed tokens using various algorithms like HS256 and RS256.
The verification feature enables quick validation of existing tokens, ensuring their integrity and authenticity. The decoding function provides easy access to token payloads and headers, helping users inspect claims and troubleshoot authentication issues. With an intuitive interface and robust features, the JWTG Calculator enhances security workflows and reduces development time.
Ideal for developers working with OAuth, API security, or implementing custom authentication schemes, this tool is essential for testing JWT implementations and preventing security lapses. It combines user-friendly JSON editors, secret management, and flexible algorithm options to meet diverse security needs.
How to Use
1. Choose your mode: Generate, Verify, or Decode.
2. To generate: Enter header parameters and claims as JSON, input your secret or private key, select algorithm, then click 'Generate'.
3. To verify: Paste the JWT and your secret key, then click 'Verify' to check its validity.
4. To decode: Paste the JWT, then click 'Decode' to view header and payload details.
5. Use the copy buttons to save your tokens or results for later use.
6. Reset inputs to start fresh or switch modes as needed.

FAQs/Additional Resources
Find Quick Answers
What is a JSON Web Token (JWT)?
Can I generate tokens with custom claims?
Is this tool suitable for testing production tokens?
Which algorithms does this tool support?
Does the tool provide private key generation?
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