JWT Token Inspector & Decoder
Inspect JSON Web Token headers, payloads, and expiration timestamps directly in your browser. 100% private client-side decoding.
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "Alex Morgan",
"role": "admin",
"email": "[email protected]",
"iat": 1516239022,
"exp": 1916239022
}Client-Side Security Notice: 2ClickKit inspects JWT headers and claims 100% in your browser. Because verification requires exposing your private/secret key to the client, secret key verification is intentionally omitted to keep your application credentials secure.
How to Use JWT Token Decoder
-
Paste your JWT token
Paste any JSON Web Token (header.payload.signature) directly into the top input area.
-
Inspect Header and Payload claims
Review decoded JSON objects for algorithm details, issuer, subject, scopes, and custom user claims.
-
Check expiration status
Instantly view whether the token is currently active or expired, with exact timestamps and relative countdowns.
Decoded JWT Claims Example
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.signature{
"sub": "1234567890",
"name": "John Doe",
"admin": true,
"iat": 1516239022
}Header and payload are formatted as clear, syntax-highlighted JSON.
Technical Specifications
- Supported Inputs: JWT (JSON Web Tokens), Base64URL encoded strings
- Input Limit: Unlimited client-side computation
- Processing Engine: 100% In-Browser (Client-side UTF-8 Base64URL Decoder)
- Content Uploads: None (Your files and text are processed locally on your device with zero uploads)
Privacy & Security Guarantee
Your security tokens are processed entirely in your web browser's memory using native client-side web technologies. Unlike traditional cloud tools, your content is never uploaded to remote servers, stored on external disks, or analyzed by third parties.
2ClickKit In-Browser vs Traditional Cloud Tools
| Feature | 2ClickKit (In-Browser) | Traditional Cloud Services |
|---|---|---|
| Data Privacy | Files never leave your local device | Uploaded to remote servers and third-party clouds |
| Processing Speed | Instant local execution (0ms upload time) | Constrained by internet upload & server processing queues |
| Account & Costs | 100% Free with zero registration or paywalls | Tiered subscriptions, limits, or forced sign-ups |
Best Practices & Tips
- Use the "Copy Payload" button to quickly copy the decoded JSON claims object for debugging API requests.
- If you need to encode or decode URLs and query parameters, check out our URL Encoder/Decoder tool.
Frequently Asked Questions
How is the JWT decoded?
A JSON Web Token consists of 3 Base64URL-encoded parts separated by periods. The tool decodes the first two parts (Header and Payload) in your browser using standard JavaScript Base64URL decoding.
Is my secret key or private JWT sent to any server?
No! 100% of decoding happens locally in your browser. Zero bytes are uploaded or saved, making it completely safe for debugging authorization tokens.
Does this tool verify token signatures?
Signature verification requires providing your application secret or private RSA key. To protect your private keys from being exposed on the web, verification is intentionally omitted.
What timestamps does the inspector understand?
Standard JWT timestamp claims like exp (expiration time), iat (issued at), and nbf (not before) are automatically converted into human-readable local and UTC times.