About this tool
Inspect the decodable header and payload portions of a JWT text sample locally. Review the claims as supplied data, keeping token decoding separate from cryptographic verification and the application’s authorisation rules.
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
मुख्य इनपुट और नियंत्रण हिंदी में देखने के लिए ऊपर “🇮🇳 हिंदी में देखें” चुनें। गणना और फ़ाइल प्रोसेसिंग इसी ब्राउज़र टैब में होती है; टूल आपके इनपुट हमारी होस्टिंग पर नहीं भेजता।
Features
- Work with Paste JWT Token (header.payload.signature).
- Review Algorithm (alg); Subject (sub); Issued At (iat) in the result breakdown.
Benefits
- Make encoded token claims readable for inspection.
- Check a token’s structure without sending it to a decoding service.
Who should use this tool?
- Developers debugging their own token sample.
- People learning JWT structure.
How to use
- Complete the labelled fields for your scenario, including Paste JWT Token (header.payload.signature). Use the units shown beside each field.
- Try the example labelled “Decode Sample HS256 JWT with iat & exp Claims” if you want to check the workflow first.
- Select Calculate / Run Tool and review Decoded JWT Payload Claims and Algorithm (alg); Subject (sub).
- Check the assumptions and limitations below. Adjust a value to compare scenarios, then copy or download the result you need.
Try these worked examples
| Scenario | Example inputs | Example result |
|---|---|---|
| Decode Sample HS256 JWT with iat & exp Claims | Paste JWT Token (header.payload.signature): eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEwMSIsIm5hbWUiOiJCaGFy… | { "sub": "user_101", "name": "Bharat Dev", "iat": 1793867400, "exp": 1825403400 } |
| Decode Admin Role JWT | Paste JWT Token (header.payload.signature): eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoic2VsbGVyX2FkbWluIiwic3RvcmUi… | { "role": "seller_admin", "store": "IN" } |
Reference and processing
IETF RFC 7519 JSON Web Token (JWT) · Listed applicability: 2025-2026
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
FAQs
Does decoding a JWT verify its signature or authorise access?
Decoding only exposes readable components. It does not establish a valid signature, trusted issuer, accepted audience or permission to access an application.
Which inputs do I need for JWT (JSON Web Token) Offline Header & Payload Inspector?
Use Paste JWT Token (header.payload.signature). The built-in examples show how those fields fit together.
What should I check before using this result?
Decodes Header and Payload locally without sending the token over the network. Does not verify private cryptographic signature keys. Check the assumptions and output against your intended task before relying on the result.
What happens to the information I enter?
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server. Tool favourites save only tool IDs in this browser. Sharing sends the tool link, not your working values or files.