JWT Expiry Checker

What is JWT Expiry Checker?

JWT Expiry Checker is a free, browser-based tool that helps you get the job done quickly. Read iat, nbf, and exp claims and see time until expiry. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

Used by

• Backend developers
• Frontend developers
• DevOps engineers
• Students

Recommended workflow

1. 1

   Prepare the input

   Use this tool as the focused step in a larger browser-based workflow.

2. 2

   Run JWT Expiry Checker

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

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Frequently asked questions

How do I use JWT Expiry Checker?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Read iat, nbf, and exp claims and see time until expiry.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is JWT Expiry Checker free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.