Test and validate JWT tokens - decode header, payload, and verify signatures in real time. The JSON Web Token Tester is one of 900+ free developer tools on Toolblip - all open to use without a signup.

Open the JSON Web Token Tester on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.

Yes. The JSON Web Token Tester is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.

Yes. The JSON Web Token Tester processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.

No. The JSON Web Token Tester runs entirely in your browser - no downloads, no accounts, no API keys. Paste your input, get the output, copy it back into your editor.

Once the page has loaded, the JSON Web Token Tester continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.