DevZeroEverything runs in your browser

JWT decode

Decode a JSON Web Token into header and payload; signature is verified offline when a secret is given.

Details and questions

Features

  • Reads header and payload without contacting a server
  • Expiry and issued-at shown as readable dates
  • Offline HS256 verification with your own secret

How to use

  1. Open the tool you need.
  2. Paste input on the left or into the input box.
  3. Read and copy the result; nothing is uploaded.

Questions

Is my data uploaded?

No. Every tool runs locally in your browser; pasted text stays on this device.

Is there a usage or length limit?

There is no account and no quota; the practical limit is the memory of this device.

What is DevZero?

DevZero is a set of local developer text tools — encoding, hashing, time, regex and more, usable offline.