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JWT Decoder

Inspect JSON Web Tokens by decoding the header and payload. Useful for debugging auth flows - decoding only, no signature verification.

Features

  • Decode header and payload
  • Show signature segment
  • Pretty-printed JSON
  • Local-only processing

How to use JWT Decoder

  • 1
    Paste a JWT into the input.
  • 2
    Inspect the decoded header and payload.
  • 3
    Copy either JSON block as needed.

Examples

Payload claim

Input
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..
Output
{
 "sub": "1234567890",
 "name": "Ada Lovelace"
}

About JWT Decoder

Parse Base64URL JWT segments into readable JSON so you can inspect claims while debugging. Signatures are not verified - this is for inspection, not auth.

Frequently asked questions

No. It only decodes. Never trust a token as authentic from decoding alone.

No. Decoding runs in your browser.

You will see an error describing what failed to parse.

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