Header and payload
Both parts are decoded and shown as readable JSON.
🪪
JWT Decoder
Read the header and payload of a JSON Web Token and see when it expires.
🔒 Enterprise privacy — 100% client-side, no server uploads
What is JWT Decoder?
JWT Decoder is a free online tool that lets you read the header and payload of a JSON Web Token and see when it expires. Enter your text or numbers and see the result instantly. Everything you type stays in your browser.
Also searched as: decode JWT, JSON Web Token decoder, JWT parser, read JWT payload.
JWT Decoder at a glance
- Price
- Free, with no paid plans
- Account
- No signup or login needed
- Where it runs
- In your web browser
- Your data
- Nothing you type is sent to a server
- Works on
- Any modern browser, on desktop and mobile
- Category
- Developer & Everyday Calculators
When to use JWT Decoder
- →Read the claims inside a token while debugging
- →Check when a token expires
- →Inspect the header and payload of a JWT
How to use JWT Decoder
- 1
Open JWT Decoder and paste or type your text into the input box.
- 2
Your result updates instantly as you type — no button to click.
- 3
Adjust any mode or format options shown above the result, if the tool offers them.
- 4
Copy the output with one click, or leave it in place to keep editing.
Why use JWT Decoder
- ✓Runs entirely in your browser — your file is never uploaded to a server.
- ✓No account, signup, or email address required to use it.
- ✓Completely free, with no daily limit and no signup.
- ✓Updates the result instantly as you type, so you can see changes in real time.
JWT Decoder
Read what is inside a JWT
Paste a JSON Web Token and see its header, payload and expiry in plain, formatted text. Nothing leaves your browser.
Expiry check
If the token has an expiry time, you are told whether it has expired or is still valid.
Raw signature shown
The signature is displayed as it appears in the token, so you can see all three parts.
Decoded on your device
The token is decoded in your browser and is not sent to Toolkitties.
Instant
Results appear as you paste.
Free, no signup
No account and no limit.
Everything you need in JWT Decoder
- Decodes the header
- Decodes the payload
- Expired or not expired message
- Shows the raw signature
- Runs in your browser
- Works on phone and computer
- No account needed
- Free to use
Tips for better results
- 1
Decoding is not verifying
This tool reads a token. It does not prove that the signature is genuine, so never rely on it for security decisions.
- 2
Be careful with live tokens
Avoid pasting production tokens into any website you do not need to. Use test tokens where you can.
- 3
Convert the times
Fields such as exp and iat are Unix timestamps. Paste them into Timestamp Converter to read them as dates.
0files uploaded
0signups needed
0cost to use
Tutorials on JWT Decoder
Short, practical guides that go with this tool.
🔒 Your privacy with JWT Decoder
JWT Decoder runs as client-side JavaScript inside your own browser tab. Your file or text is read, processed, and turned into a result on your device — it is never sent to, stored on, or seen by Toolkitties' servers. Closing or refreshing the page clears everything.
Frequently asked questions
Does the JWT Decoder verify the signature?
No. It reads the header and payload and shows the expiry. It does not prove that a token is genuine.
Is it safe to paste a token here?
Decoding happens in your browser and the token is not sent to Toolkitties. Still, avoid pasting live production tokens anywhere you do not need to.
What are the three parts of a JWT?
A header, a payload with the claims, and a signature, separated by dots.
How does it tell me a token has expired?
It reads the expiry claim in the payload and compares it with the current time.
Why does it say my token is invalid?
The text may not have three parts separated by dots, or may contain extra spaces or missing characters.
Can I read exp and iat as dates?
Yes. Paste those numbers into the Timestamp Converter.
Is JWT Decoder free to use?
Yes. JWT Decoder is 100% free, with no signup, no daily limit and no paid plans.
Do I need to create an account to use JWT Decoder?
No signup or login is required. Open the page and start using JWT Decoder immediately.
Is it safe to use JWT Decoder with private or sensitive files?
Yes. JWT Decoder processes your file locally in your browser using client-side code. The file itself is never uploaded to Toolkitties' servers.
Does JWT Decoder store the text I enter?
No. Your text is processed in memory in your browser tab and is cleared as soon as you close or refresh the page.