JWT Decoder
Decode and inspect JSON Web Tokens
How to Use JWT Decoder
- Paste your JSON Web Token into the input.
- Header, payload and signature are separated and decoded.
- Review the claims, including issued-at and expiry timestamps translated to readable dates.
About JWT Decoder
What this page solves
Decodes JSON Web Tokens locally so production access tokens never leave your device — unlike most online JWT debuggers that quietly upload your token.
JWT Decoder is a free developer utility that lets you decode and inspect json web tokens directly in your browser. It is designed for everyday engineering tasks: debugging API responses, sanitizing payloads, validating data structures, generating test inputs, or transforming code between formats. Because every operation runs client-side in JavaScript, none of your code, tokens, or proprietary data is ever transmitted to a server — making JWT Decoder safe for production credentials, internal schemas, and confidential snippets. It is part of our Developer Tools collection, which covers formatters, converters, validators, and generators for the languages and protocols you actually use. If you also need a complementary utility, try our JSON Formatter. JWT Decoder is free, requires no signup, and works the same on macOS, Windows, Linux, and ChromeOS — perfect for quick fixes between IDE sessions or for sharing a reproducible workflow with teammates.
Common Use Cases
- Debug an expired or invalid access token from your auth provider
- Inspect the claims inside a JWT during local development
- Verify a JWT signature against a shared secret in your browser
- Check token expiry when a user reports login issues
- Pretty-print the decoded payload with [LINK:JSON Formatter|/tool/json-formatter]
Related tools in Developer Tools
- JSON FormatterFormat, beautify and validate JSON data
- JSON ViewerBrowse JSON as a collapsible tree with syntax colors
- JSON ParserParse JSON and inspect keys, arrays, depth and node count
- JSON Pretty PrintPretty print JSON with 2 or 4 space indent
See all Developer Tools.
Frequently asked questions
Is it safe to paste a real token here?
Here, yes — decoding runs entirely in your browser and the token is never sent anywhere. Be careful with online JWT decoders generally, though: many transmit to a server, and a token pasted into one should be treated as compromised and rotated.
Does this verify the signature?
No. Verification requires the secret or public key that signed the token, which you should not paste into any web tool. This decodes and displays the contents so you can inspect claims. Verification belongs in your application code.
Why can anyone read my token contents?
A standard JWT is signed, not encrypted. The signature proves the token has not been altered; it does nothing to hide the payload, which is plain base64. Never put anything confidential in JWT claims — assume the holder reads all of it.
What do the timestamp claims mean?
They are Unix timestamps in seconds. `exp` is when the token stops being valid, `iat` when it was issued, and `nbf` the earliest it may be used. All three are shown here as readable dates.
My token shows as expired but still works. Why?
Expiry is enforced by the receiving application, not the token. Some servers allow clock-skew tolerance, and some fail to check `exp` at all — which is a security bug worth reporting if it is your own system.
How to use JWT Decoder?
1) Open the tool. 2) Enter or upload your input. 3) Get your result instantly. Everything happens locally — nothing is uploaded.
When should I use JWT Decoder?
Use it when debugging an authentication issue, inspecting a token expiry, or verifying a JWT payload during development.
Is JWT Decoder safe?
Yes. JWT Decoder runs 100% in your browser. Inputs are never uploaded, stored, or logged — safe for confidential content.
Will quality be affected by JWT Decoder?
JWT Decoder performs lossless operations — your content is not re-encoded or downgraded.
What formats does JWT Decoder support?
JWT Decoder supports JSON, YAML, XML, CSV, TOML and other developer-friendly text formats
Is JWT Decoder free?
Yes — JWT Decoder is completely free, with no registration, no watermarks, and no usage limits.
Is JWT Decoder safe for sensitive data like API keys or tokens?
Yes. All processing in JWT Decoder happens locally in your browser. No request is sent to any server, so credentials and proprietary code remain on your device.
Does JWT Decoder work offline?
After the page loads, JWT Decoder runs entirely in JavaScript and does not need a network connection for its core operations.
Can I integrate JWT Decoder into a CI pipeline?
JWT Decoder is a browser-based utility. For automation, use the equivalent open-source library — but for one-off debugging it remains the fastest option.