What is the JWT Decoder?
Decode and inspect JWT header and payload. The JWT Decoder is a free online tool that works instantly in your browser — no installation, no signup and nothing to upload. It sits alongside other Developer tools on DevNibble such as UUID Generator, Regex Tester, Timestamp Converter.
How to use the JWT Decoder
- Paste the encoded input.
- The decoded output appears instantly.
- Copy the result.
Features
- Runs 100% in your browser — your data is never uploaded or stored.
- Free forever, with no account, no ads and no tracking.
- Copy or download your result in one click.
- Fast and responsive on desktop, tablet and mobile.
Frequently asked questions
Does this verify the JWT signature?
No. It only decodes and displays the header and payload; it does not verify signatures and never sends your token anywhere.
Is it safe to paste my token?
Yes — decoding runs entirely in your browser and the token never leaves your device.
What is a JWT?
A JSON Web Token is a compact, URL-safe token with a header, payload and signature, used for authentication.