CSR Parser API

CSR Parser extracts and analyzes information from Certificate Signing Requests (CSRs), providing detailed subject information, public key details, and fingerprints.

The CSR Parser API provides a simple, reliable way to integrate csr parser functionality into your applications. Built for developers who need production-ready csr parser capabilities without the complexity of building from scratch.

View API Details →

Available on:

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Quick Start

Using JavaScript

async function callCSRParserAPI() {
    try {
        const requestBody = {
    "csr": "-----BEGIN CERTIFICATE REQUEST-----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\nqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqK\n-----END CERTIFICATE REQUEST-----"
};

        const response = await fetch('https://api.apiverve.com/v1/csrparser', {
            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);
    }
}

callCSRParserAPI();

Using cURL

curl -X POST "https://api.apiverve.com/v1/csrparser" \
  -H "x-api-key: YOUR_API_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{
    "csr": "-----BEGIN CERTIFICATE REQUEST-----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\nqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqK\n-----END CERTIFICATE REQUEST-----"
}'

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/csrparser

View NPM Package → | Package Code →

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🔷 NuGet (.NET/C#)

dotnet add package APIVerve.API.CSRParser

View NuGet Package → | Package Code →

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🐍 Python (PyPI)

pip install apiverve-csrparser

View PyPI Package → | Package Code →

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💎 Ruby (RubyGems)

gem install apiverve_csrparser

View RubyGems Package → | Package Code →

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🐘 PHP (Packagist)

composer require apiverve/csrparser

View Packagist Package → | Package Code →

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🎯 Dart (pub.dev)

dart pub add apiverve_csrparser

View pub.dev Package → | Package Code →

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🤖 Android (JitPack)

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

Package Code →

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🐹 Go

go get github.com/apiverve/csrparser-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: CSR Parser API
• 📚 API Reference: docs.apiverve.com/ref/csrparser
• 📖 OpenAPI Spec: openapi.yaml
• 💡 Examples: examples/

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What Can You Build?

The CSR Parser API is commonly used for:

• Web Applications - Add csr parser 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 csr parser 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 CSR Parser API:

{
  "status": "ok",
  "error": null,
  "data": {
    "version": "v1",
    "subject": {
      "common_name": "example.com",
      "organization": "Example Company Inc",
      "organizational_unit": "IT Department",
      "locality": "San Francisco",
      "state": "California",
      "country": "US",
      "email": "admin@example.com"
    },
    "public_key": {
      "algorithm": "RSA",
      "size_bits": 2048,
      "exponent": 65537
    },
    "signature_algorithm": "SHA256withRSA",
    "extensions": [],
    "fingerprints": {
      "sha1": "82:D3:E3:9A:FB:85:22:65:16:84:43:2F:BB:05:35:2A:95:37:BF:58",
      "sha256": "D8:73:E8:A3:DE:22:57:D6:AD:A0:AD:AB:53:75:FB:09:07:79:4D:21:CF:F1:0A:C0:55:EF:4B:67:A0:20:FE:9D",
      "md5": "4A:AC:A6:9D:40:6C:2F:34:51:D3:A7:7E:06:23:66:0A"
    },
    "pem": "-----BEGIN CERTIFICATE REQUEST-----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\nqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqKqK\n-----END CERTIFICATE REQUEST-----",
    "size_bytes": 705,
    "format": "PEM",
    "is_valid": true,
    "security_assessment": {
      "is_weak_key": false,
      "is_deprecated_signature": false,
      "key_strength": "acceptable"
    }
  }
}

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Support & Community

• 🏠 API Home: CSR Parser 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.