JWT डीकोडर

JWT टोकन को डीकोड और मान्य करें

JWT Decoder & Verifier

Decode and Analyze JSON Web Tokens

Paste any JWT token to instantly view its header, payload, and signature. Automatically check expiration, verify standard claims, and understand token structure. Perfect for debugging API authentication issues.

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TL;DR

Paste JWT token, click decode, view header/payload/signature, check expiration, copy results.

JWT Token Input

How to use the JWT Decoder:

  • Paste your JWT token in the input field above
  • Click 'Decode JWT' to view the header, payload, and signature
  • Check token expiration and standard claims automatically
  • Use the signature verification section to validate token authenticity
  • Copy individual sections using the copy buttons

Key Features

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Instant Decoding

Decode JWT tokens in milliseconds with automatic Bearer prefix removal. See header, payload, and signature immediately formatted as readable JSON.

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Automatic Expiration Check

Instantly see if your token is expired or valid. The tool automatically extracts the exp claim and compares it with current time, displaying clear status indicators.

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Standard Claims Display

View important JWT claims at a glance: algorithm (alg), issuer (iss), audience (aud), and expiration time. Perfect for quick token validation during API debugging.

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Client-Side Processing

All decoding happens in your browser. No server uploads, no data storage, complete privacy. Your sensitive tokens never leave your device.

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Signature Verification Demo

Understand JWT verification flow with our demonstration feature. Enter HMAC secret or RSA/ECDSA public key to simulate signature validation (server-side implementation recommended for production).

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One-Click Copy

Copy header, payload, or signature with a single click. Perfect for pasting into documentation, logs, or other debugging tools.

How to Use

Decode JWT tokens in three simple steps

1

Paste JWT Token

Paste your JWT token into the input field. If your token includes a 'Bearer ' prefix, the tool will automatically remove it. In 'jwt decoder online' scenarios, you can copy the token directly from API responses or browser developer tools, and the tool will handle format issues automatically. The input field supports multi-line text for handling long tokens.

2

Decode and View Results

Click the 'Decode JWT' button, and the tool will immediately parse the three parts of the token: Header, Payload, and Signature. The Header displays the signature algorithm (like HS256, RS256), and the Payload contains user claims and metadata. Similar to the 'jwt token decoder' experience, you'll see beautifully formatted JSON for easy reading. The tool also automatically checks if the token is expired, displaying the expiration time and status (Valid/Expired).

3

Copy or Verify Signature

You can use the 'Copy' button to copy the Header, Payload, or Signature to your clipboard for use in documentation or other tools. If you need to verify the signature, expand the 'Signature Verification' module, enter the key (HMAC algorithms use Secret Key, RSA/ECDSA algorithms use Public Key), and click 'Verify Signature'. Note: This is a demonstration feature; production environments should perform signature verification on the server-side to ensure security. This is especially useful for 'jwt verifier online' scenarios, helping you understand the verification process.

Real-World Use Cases

See how JWT Decoder solves common development and security challenges

API Authentication Debugging

A frontend developer encountered a 401 Unauthorized error when integrating a third-party API. Using the 'jwt decoder online' tool, they pasted the token from the request and discovered it had expired (the exp time was earlier than the current time). The Header showed the algorithm as HS256, and the Payload contained an expired timestamp. By viewing the decoded content, the developer quickly identified the issue: the token refresh logic had failed. Benefits included reducing debugging time by 70% and quickly restoring API functionality.

Key Benefits

  • ✓Reduced debugging time by 70%
  • ✓Quickly identified token refresh failures
  • ✓Restored API functionality within minutes

Security Audit and Permission Verification

During a security team audit, engineers needed to verify that JWT tokens generated by the application contained the correct permission claims. Using the tool to decode multiple tokens, they checked the 'role', 'permissions', and 'aud' fields in the Payload. Similar to 'jwt token decoder' audit scenarios, the tool helped quickly compare claims across different users, discovering that some tokens were missing necessary 'aud' claims, presenting a security risk. Benefits included improving audit efficiency by 50% and identifying and fixing 3 security vulnerabilities.

Key Benefits

  • ✓Improved security audit efficiency by 50%
  • ✓Identified 3 critical security vulnerabilities
  • ✓Validated permission claims across user roles

Third-Party Service Integration Testing

A QA engineer testing login functionality integrated with Auth0 needed to verify the structure of returned JWT tokens. Using the 'jwt verifier online' feature, they pasted the token and decoded it, viewing the algorithm in the Header (RS256) and the 'iss' (Auth0 domain) and 'sub' (user ID) in the Payload. They expanded the signature verification module, entered the Auth0 public key, and verified the signature validity (demo mode). Benefits included quickly understanding token structure, validating integration correctness, and reducing integration testing time by 40%.

Key Benefits

  • ✓Reduced integration testing time by 40%
  • ✓Validated Auth0 token structure correctly
  • ✓Understood OAuth flow implementation details

Frequently Asked Questions