JWT Decoder API

JWT Decoder decodes JWT tokens to reveal header and payload information, and on paid plans verifies the signature against a public key you supply. It handles JSON web token decode from any language over REST, so you can inspect claims and expiry without adding a JWT library.

The JWT Decoder API provides a simple, reliable way to integrate jwt decoder functionality into your applications. Built for developers who need production-ready jwt decoder capabilities without the complexity of building from scratch.

View API Details →

Available on:

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Quick Start

Using JavaScript

async function callJWTDecoderAPI() {
    try {
        const requestBody = {
    "token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6InNhbXBsZS1rZXktMSJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaXNzIjoiaHR0cHM6Ly9hdXRoLmV4YW1wbGUuY29tIiwiYXVkIjoiYXBpLmV4YW1wbGUuY29tIiwiaWF0IjoxNzY3MjI1NjAwLCJleHAiOjIwODI3NTg0MDB9.hP0O9ELZGk-KN3upyYqdOnPY2Ig7FAzfUY_xytzOCBIhn0_TWdzl2dbLPlj0rkCDsRIQX0I5t9Xv551VI1W9dmvRGtVztyeD3IKHnIn24baOUtjU7Eb6FHL_iWMu5PqMeQJPFytuYbYhzjjCNfFPgAciGgn1Celr8H7_q51x5naMb-nbTvBc5SIX9MBnegGzabExBYQ-OsdKOoYmK0uymNIgC3834jlPuhuJHkPsxX7ncKoSQ4wheiLaZDwFANlT1NrD2XgKyyh-LIIg9CRwqB_WDktZ_R6UusNkLRhKJ20ff29ttkyRhJZzEqRRK60xYn7iPyg4YQni1J_w-oAa_w",
    "publicKey": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9MiLgWPmLJoEIpAUHVvx\nGyo9vyW9/ryejQyuDZr1m5x0qj5y1otdjN3TwLH1PBQuinSDGiL7O56dfXwy/YIa\nKOhANcJWe78eSDs4oMh3wQnzRfseWZfFgbLHU/nWyXjPE5WRa9F+H5A96KvmatER\nG+kfWUINKR0RUTzox9xSy1KmiaQ5a2GoH3vINioVWBN1zX7Uq6mjCF5nYUMfWDyv\nuUofPWRU2saYdxD2TtVlIs8F62IQU0bnMifFXqmZ5CkmXwPAFJXAIi38Lh/vkOvw\n5B8oeiZd8ZEOLhSYlmhje1IGIwlB8B/ekKnZp4BdKsJYgGka7yn9NTuRsx8U7tfr\n7QIDAQAB\n-----END PUBLIC KEY-----"
};

        const response = await fetch('https://api.apiverve.com/v1/jwtdecoder', {
            method: 'POST',
            headers: {
                'x-api-key': 'YOUR_API_KEY_HERE',
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(requestBody)
        });

        const data = await response.json();
        console.log(data);
    } catch (error) {
        console.error('Error:', error);
    }
}

callJWTDecoderAPI();

Using cURL

curl -X POST "https://api.apiverve.com/v1/jwtdecoder" \
  -H "x-api-key: YOUR_API_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{
    "token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6InNhbXBsZS1rZXktMSJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaXNzIjoiaHR0cHM6Ly9hdXRoLmV4YW1wbGUuY29tIiwiYXVkIjoiYXBpLmV4YW1wbGUuY29tIiwiaWF0IjoxNzY3MjI1NjAwLCJleHAiOjIwODI3NTg0MDB9.hP0O9ELZGk-KN3upyYqdOnPY2Ig7FAzfUY_xytzOCBIhn0_TWdzl2dbLPlj0rkCDsRIQX0I5t9Xv551VI1W9dmvRGtVztyeD3IKHnIn24baOUtjU7Eb6FHL_iWMu5PqMeQJPFytuYbYhzjjCNfFPgAciGgn1Celr8H7_q51x5naMb-nbTvBc5SIX9MBnegGzabExBYQ-OsdKOoYmK0uymNIgC3834jlPuhuJHkPsxX7ncKoSQ4wheiLaZDwFANlT1NrD2XgKyyh-LIIg9CRwqB_WDktZ_R6UusNkLRhKJ20ff29ttkyRhJZzEqRRK60xYn7iPyg4YQni1J_w-oAa_w",
    "publicKey": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9MiLgWPmLJoEIpAUHVvx\nGyo9vyW9/ryejQyuDZr1m5x0qj5y1otdjN3TwLH1PBQuinSDGiL7O56dfXwy/YIa\nKOhANcJWe78eSDs4oMh3wQnzRfseWZfFgbLHU/nWyXjPE5WRa9F+H5A96KvmatER\nG+kfWUINKR0RUTzox9xSy1KmiaQ5a2GoH3vINioVWBN1zX7Uq6mjCF5nYUMfWDyv\nuUofPWRU2saYdxD2TtVlIs8F62IQU0bnMifFXqmZ5CkmXwPAFJXAIi38Lh/vkOvw\n5B8oeiZd8ZEOLhSYlmhje1IGIwlB8B/ekKnZp4BdKsJYgGka7yn9NTuRsx8U7tfr\n7QIDAQAB\n-----END PUBLIC KEY-----"
}'

Get your API key: https://apiverve.com

📁 For more examples, see the examples folder

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Installation

Choose your preferred programming language:

📦 NPM (JavaScript/Node.js)

npm install @apiverve/jwtdecoder

View NPM Package → | Package Code →

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🔷 NuGet (.NET/C#)

dotnet add package APIVerve.API.JWTDecoder

View NuGet Package → | Package Code →

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🐍 Python (PyPI)

pip install apiverve-jwtdecoder

View PyPI Package → | Package Code →

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💎 Ruby (RubyGems)

gem install apiverve_jwtdecoder

View RubyGems Package → | Package Code →

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🐘 PHP (Packagist)

composer require apiverve/jwtdecoder

View Packagist Package → | Package Code →

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🎯 Dart (pub.dev)

dart pub add apiverve_jwtdecoder

View pub.dev Package → | Package Code →

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🤖 Android (JitPack)

implementation 'com.github.apiverve:jwtdecoder-api:1.0.0'

Package Code →

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🐹 Go

go get github.com/apiverve/jwtdecoder-api/go

Package Code →

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Why Use This API?

Feature	Benefit
Multi-language SDKs	Native packages for JavaScript, Python, C#, Go, and Android
Simple Integration	Single API key authentication, consistent response format
Production Ready	99.9% uptime SLA, served from 24 global regions
Comprehensive Docs	Full examples, OpenAPI spec, and dedicated support

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Documentation

• 🏠 API Home: JWT Decoder API
• 📚 API Reference: docs.apiverve.com/ref/jwtdecoder
• 📖 OpenAPI Spec: openapi.yaml
• 💡 Examples: examples/

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What Can You Build?

The JWT Decoder API is commonly used for:

• Web Applications - Add jwt decoder features to your frontend or backend
• Mobile Apps - Native SDKs for Android development
• Automation - Integrate with n8n, Zapier, or custom workflows
• SaaS Products - Enhance your product with jwt decoder capabilities
• Data Pipelines - Process and analyze data at scale

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API Reference

Authentication

All requests require an API key in the header:

x-api-key: YOUR_API_KEY_HERE

Get your API key: https://apiverve.com

Response Format

Every APIVerve endpoint returns the same envelope — check status, then read data:

{
  "status": "ok",
  "error": null,
  "data": { ... }
}

Example Response

A real response from the JWT Decoder API:

{
  "status": "ok",
  "error": null,
  "data": {
    "header": {
      "alg": "RS256",
      "typ": "JWT",
      "kid": "sample-key-1"
    },
    "payload": {
      "sub": "1234567890",
      "name": "John Doe",
      "iss": "https://auth.example.com",
      "aud": "api.example.com",
      "iat": 1767225600,
      "exp": 2082758400
    },
    "signature": "hP0O9ELZGk-KN3upyYqdOnPY2Ig7FAzfUY_xytzOCBIhn0_TWdzl2dbLPlj0rkCDsRIQX0I5t9Xv551VI1W9dmvRGtVztyeD3IKHnIn24baOUtjU7Eb6FHL_iWMu5PqMeQJPFytuYbYhzjjCNfFPgAciGgn1Celr8H7_q51x5naMb-nbTvBc5SIX9MBnegGzabExBYQ-OsdKOoYmK0uymNIgC3834jlPuhuJHkPsxX7ncKoSQ4wheiLaZDwFANlT1NrD2XgKyyh-LIIg9CRwqB_WDktZ_R6UusNkLRhKJ20ff29ttkyRhJZzEqRRK60xYn7iPyg4YQni1J_w-oAa_w",
    "isExpired": false,
    "expiresAt": "2036-01-01T00:00:00.000Z",
    "issuedAt": "2026-01-01T00:00:00.000Z",
    "tokenAge": "309 days",
    "algorithm": "RS256",
    "expiresIn": 288757380,
    "notYetValid": false,
    "securityAnalysis": {
      "isUnsecured": false,
      "hasExpiration": true,
      "isLongLived": true,
      "issues": [
        "Token lifetime exceeds 24 hours"
      ]
    },
    "warning": "Signature verified with the supplied public key.",
    "signatureVerification": {
      "verified": true,
      "algorithm": "RS256",
      "keyType": "RSA",
      "reason": null,
      "claimsValid": true,
      "claimsReason": null
    }
  }
}

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Support & Community

• 🏠 API Home: JWT Decoder API
• 💬 Support: https://apiverve.com/contact
• 🐛 Issues: GitHub Issues
• 📖 Documentation: https://docs.apiverve.com
• 🌐 Website: https://apiverve.com

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Contributing

We welcome contributions! Please see CONTRIBUTING.md for guidelines.

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Security

For security concerns, please review our Security Policy.

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License

This project is licensed under the MIT License - see the LICENSE file for details.

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Acknowledgments

Built with ❤️ by APIVerve

Copyright © 2026 APIVerve. All rights reserved.