How to use: JWT Decoder
JWT Decoder is a free online Security Tools tool that inspect JWT header, payload and signature metadata instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
How to use
Using JWT Decoder takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Description
Inspect JWT header, payload and signature metadata.
Because everything is computed client-side, JWT Decoder is safe to use with sensitive data such as API keys, tokens or private logs.
Run
These ready-made examples show typical inputs and the exact output JWT Decoder produces for them.
Examples
Decoded without verification.
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.KMUFsIDTnFmyG3nMiGM6H9FNFUROf3wh7SmqJp-QV30
Use cases
Common situations where JWT Decoder helps:
- Inspect JWT header, payload and signature metadata.
- Because everything is computed client-side, JWT Decoder is safe to use with sensitive data such as API keys, tokens or private logs.
FAQ
What is JWT Decoder?
JWT Decoder inspect JWT header, payload and signature metadata. It runs entirely in your browser, so your data stays private.
Is JWT Decoder free to use?
Yes. JWT Decoder is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.