JWT Decoder
Decode JSON Web Tokens to inspect the header, payload and expiry. Tokens never leave your browser.
Loading tool…
Runs entirely in your browser — nothing is uploaded
How to use the JWT Decoder
- 1
Paste a token
The three parts are colour-coded.
- 2
Read header and payload
Pretty-printed JSON.
- 3
Check expiry
Times are converted to dates.
Debug authentication by reading what’s inside a JWT: algorithm, claims, issued-at and expiry times shown as readable dates. Pasting tokens into online tools is risky — here they stay on your device.
Read the full guide with screenshotsFrequently asked questions
Is the JWT Decoder free?
Yes — completely free with no daily limit and no account. ZapMorph’s viewers and developer tools are unmetered.
Is what I type sent anywhere?
No. Everything runs in your browser with JavaScript. Nothing you enter is sent to our servers, which makes it safe for API keys, tokens and private data.
Does it work on my phone?
Yes. It works in any modern browser on iPhone, Android, Windows, Mac and Linux, with nothing to install.
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