🔐 JWT Decoder Online
The JWT Decoder Tool helps you decode and analyze any JSON Web Token by extracting its header and payload in human-readable format. Instantly view token claims, expiration time, user data, and metadata without exposing your information to a server. You can also verify the token's signature using a secret key to check its authenticity. This secure JWT decoding tool is perfect for debugging, validating, and understanding JWT-based authentication flows.
Why Use Our JWT Decoder?
- 🔍 Instantly decode JWTs in your browser.
- 🧩 Verify signatures with HS256, HS384, HS512.
- 🛡️ 100% client-side, no data is uploaded.
- 💡 Perfect for debugging, testing, and learning JWT structure.
How JWT Decoding Works
A JWT consists of header, payload, and signature. The decoder parses the Base64 URL encoded segments and optionally verifies the signature with your secret key.
This process is fully client-side, fast, and secure — ideal for developers and API testing.
JWT Decoder Use Cases
- 🔹 Debug API authentication tokens
- 🔹 Inspect SSO or OAuth tokens
- 🔹 Learn JWT structure for educational purposes
- 🔹 Verify integrity of client-server communications
Frequently Asked Questions
Related Tools
Explore other free online tools from DevToolsKit.dev to improve your workflow, secure your accounts, and manage code efficiently.
Decode long or encoded links back to readable text. Perfect for debugging, analyzing URLs, or extracting query parameters effortlessly.
Decode Base64 encoded text or files back to their original format. 100% free, browser-based Base64 decoder—safe, secure, and easy to use.
Decode JWT tokens instantly in your browser. Inspect header, payload, and signature. Verify using HS256, HS384, or HS512 algorithms.