1. Paste a JWT Token: Copy your JWT and paste it into the “Paste JWT Token Here” field.

2. (Optional) Add a Secret Key: If you want to verify the signature, enter the corresponding secret (HS256 only).

3. Decode & Verify: Click the “Decode & Verify JWT” button to instantly decode and validate the token.

4. Review Header & Payload: View the decoded JSON with color-coded syntax for easy reading.

5. Understand Claims: Scroll down to the explanation table for human-readable definitions of each claim (e.g., exp, iat, sub).

6. Generate a Sample Token: Use the “Generate Sample JWT” button to quickly test the decoder with a pre-filled token.

7. Reset If Needed: Use the “Reset” button to clear all fields and results.

8. Copy the Output: Click “Copy Decoded Info” to grab the decoded content for your documentation or debugging.