JWT Expiration & Payload Inspector
Inspect JSON Web Token (JWT) expiration Unix timestamps and calculate hours until token expiry.
- 100% free
- Private in browser
- No signup
- No watermarks
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About JWT Expiration & Payload Inspector
Inspect JSON Web Token (JWT) expiration Unix timestamps and calculate hours until token expiry. Enter JWT "iat" and JWT "exp" and the tool works out Total Token Lifespan, Total Token Lifespan and Valid Token Window straight away. Everything runs in your browser, so your data never leaves your device.
How to use JWT Expiration & Payload Inspector
- Enter JWT "iat" and JWT "exp".
- Change any value to see the result update instantly.
- Read Total Token Lifespan, Total Token Lifespan and Valid Token Window in the results panel — copy or download what you need.
Key features
- Shows Total Token Lifespan (Hours)
- Shows Total Token Lifespan (Minutes)
- Shows Valid Token Window (1=Yes, 0=Zero Duration)
- 2 adjustable inputs, results update as you type
- No signup, no limits
Frequently asked questions
- Is this calculation free and private?
- Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
- What does the JWT Expiration & Payload Inspector give me?
- It works out Total Token Lifespan, Total Token Lifespan and Valid Token Window, updating live as you change the inputs.
- What do I need to enter?
- Just JWT "iat" and JWT "exp". Every field has a sensible default you can start from.
- Is my data uploaded anywhere?
- No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
- Does it work on a phone?
- Yes. The layout adapts to small screens and needs no app or signup.
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