# QR Code Generator API: Complete Developer Documentation Guide Source: https://qrmommy.com/blog/qr-code-api-guide Developer Guide # QR Code Generator API: Complete Developer Documentation Guide Comprehensive guide to QR code generator APIs. Learn about endpoints, authentication, code examples, rate limits, and best practices for integrating QR code generation into your applications. QR Mommy Team November 20, 2025 20 min read QR code APIs enable developers to programmatically generate, customize, and track QR codes at scale. Whether you're building an e-commerce platform, event management system, or marketing automation tool, understanding QR code APIs is essential. This comprehensive guide covers everything you need to integrate QR code generation into your applications. ## Table of Contents ## 1. What is a QR Code API? A QR code API (Application Programming Interface) is a set of protocols and tools that allows developers to create, customize, and manage QR codes programmatically. Instead of manually generating QR codes through a web interface, APIs enable automated, scalable QR code creation directly from your application code. ### Core API Functions - Generate static QR codes - Create dynamic (trackable) QR codes - Customize colors, logos, and styles - Retrieve scan analytics - Update QR code destinations - Bulk generate multiple codes ### Response Formats - PNG image (base64 or URL) - SVG vector format - PDF document - EPS for print - JSON metadata ## 2. API Use Cases QR code APIs power a wide range of applications across industries: ### E-commerce Platforms Generate QR codes for product pages, order tracking, warranty registration, and mobile payments. Automatically create codes when new products are added to inventory. ### Event Management Issue unique QR code tickets for attendees, track check-ins in real-time, and enable contactless badge scanning. Integrate with registration systems for automated ticket generation. ### Marketing Automation Create personalized QR codes for direct mail campaigns, track engagement by campaign/segment, and generate unique codes for A/B testing different landing pages. ### Inventory and Asset Management Generate QR codes for asset tagging, track equipment locations and maintenance history, and automate label printing when new items are added. ### Document Management Embed QR codes in invoices, contracts, and reports linking to digital copies. Enable document verification and access to supplementary materials. ## 3. Authentication Methods QR code APIs use various authentication methods to secure access: ### API Key Authentication The most common method. Include your API key in request headers or query parameters. // Header authentication curl -X POST https://api.example.com/qr \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" // Query parameter GET /qr?api_key=YOUR_API_KEY&data=https://example.com ### OAuth 2.0 Used by enterprise APIs for delegated authorization and token refresh. // Get access token POST /oauth/token { "grant_type": "client_credentials", "client_id": "your_client_id", "client_secret": "your_client_secret" } // Use token in requests Authorization: Bearer {access_token} ### Basic Authentication Simple username/password encoding. Less common for modern APIs. Authorization: Basic base64(username:password) Security Best Practices - - Never expose API keys in client-side code - - Use environment variables for key storage - - Rotate keys periodically - - Use separate keys for development and production - - Monitor for unauthorized usage ## 4. Common API Endpoints Most QR code APIs follow RESTful conventions with these standard endpoints: MethodEndpointDescriptionPOST/qr-codesCreate a new QR codeGET/qr-codesList all QR codesGET/qr-codes/{id}Get specific QR code detailsPUT/qr-codes/{id}Update QR code (dynamic only)DELETE/qr-codes/{id}Delete a QR codeGET/qr-codes/{id}/analyticsGet scan analyticsGET/qr-codes/{id}/downloadDownload QR code imagePOST/qr-codes/bulkCreate multiple QR codes ## 5. Request Parameters Common parameters when creating QR codes via API: ### Required Parameters ParameterTypeDescriptiondatastringThe content to encode (URL, text, etc.)typestringQR code type (url, vcard, wifi, email, sms) ### Customization Parameters ParameterTypeDescriptionsizeintegerImage size in pixels (e.g., 300)colorstringForeground color (hex: #000000)backgroundColorstringBackground color (hex: #FFFFFF)logostringLogo URL or base64 imageerrorCorrectionstringL, M, Q, or HformatstringOutput format (png, svg, pdf)marginintegerQuiet zone size in modules ### Dynamic QR Code Parameters ParameterTypeDescriptionnamestringInternal name for organizationfolderIdstringFolder/project ID for organizationtagsarrayTags for filtering and searchexpiresAtdatetimeExpiration date for time-limited codes ## 6. Code Examples Here are practical code examples for common QR code API operations: ### JavaScript (Node.js) - Create QR Code const axios = require('axios'); async function createQRCode(data, options = {}) { try { const response = await axios.post( 'https://api.qrmommy.com/v1/qr-codes', { data: data, type: 'url', size: options.size || 300, color: options.color || '#000000', backgroundColor: options.backgroundColor || '#FFFFFF', errorCorrection: options.errorCorrection || 'M', format: options.format || 'png' }, { headers: { 'Authorization': `Bearer ${process.env.QR_API_KEY}`, 'Content-Type': 'application/json' } } ); return response.data; } catch (error) { console.error('Error creating QR code:', error.response?.data); throw error; } } // Usage const qrCode = await createQRCode('https://mywebsite.com', { size: 400, color: '#1a73e8' }); console.log('QR Code URL:', qrCode.imageUrl); ### Python - Create Dynamic QR Code with Logo import requests import os def create_qr_with_logo(url, logo_url, name): api_key = os.environ.get('QR_API_KEY') payload = { 'data': url, 'type': 'url', 'name': name, 'size': 500, 'color': '#2563eb', 'backgroundColor': '#ffffff', 'logo': logo_url, 'errorCorrection': 'H', # High for logo support 'format': 'png' } headers = { 'Authorization': f'Bearer {api_key}', 'Content-Type': 'application/json' } response = requests.post( 'https://api.qrmommy.com/v1/qr-codes', json=payload, headers=headers ) if response.status_code == 201: return response.json() else: raise Exception(f'API Error: {response.text}') # Usage qr = create_qr_with_logo( url='https://mystore.com/product/123', logo_url='https://mystore.com/logo.png', name='Product 123 QR' ) print(f"QR Code ID: {qr['id']}") print(f"Download URL: {qr['imageUrl']}") ### PHP - Bulk QR Code Generation $item['url'], 'name' => $item['name'], 'type' => 'url', 'size' => 300, 'tags' => $item['tags'] ?? [] ]; }, $items); $ch = curl_init('https://api.qrmommy.com/v1/qr-codes/bulk'); curl_setopt_array($ch, [ CURLOPT_RETURNTRANSFER => true, CURLOPT_POST => true, CURLOPT_POSTFIELDS => json_encode(['qrCodes' => $qrCodes]), CURLOPT_HTTPHEADER => [ 'Authorization: Bearer ' . $apiKey, 'Content-Type: application/json' ] ]); $response = curl_exec($ch); $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE); curl_close($ch); if ($httpCode === 201) { return json_decode($response, true); } throw new Exception('Bulk creation failed: ' . $response); } // Usage $items = [ ['url' => 'https://store.com/product/1', 'name' => 'Product 1', 'tags' => ['electronics']], ['url' => 'https://store.com/product/2', 'name' => 'Product 2', 'tags' => ['electronics']], ['url' => 'https://store.com/product/3', 'name' => 'Product 3', 'tags' => ['clothing']] ]; $result = bulkCreateQRCodes($items); echo "Created " . count($result['qrCodes']) . " QR codes\n"; ### cURL - Get Analytics # Get scan analytics for a specific QR code curl -X GET "https://api.qrmommy.com/v1/qr-codes/qr_abc123/analytics" \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "startDate": "2025-01-01", "endDate": "2025-01-31", "groupBy": "day" }' # Response example: { "totalScans": 1523, "uniqueScans": 892, "scansByDate": [ {"date": "2025-01-01", "scans": 45}, {"date": "2025-01-02", "scans": 62} ], "scansByLocation": [ {"country": "US", "city": "New York", "scans": 234}, {"country": "US", "city": "Los Angeles", "scans": 189} ], "scansByDevice": [ {"os": "iOS", "scans": 823}, {"os": "Android", "scans": 700} ] } ## 7. Rate Limits and Quotas API providers implement rate limits to ensure fair usage and system stability: PlanRequests/MinuteQR Codes/MonthBulk LimitFree10505 per requestBasic6050025 per requestProfessional3005,000100 per requestEnterprise1,000+Unlimited500 per request ### Handling Rate Limits APIs return rate limit information in response headers: X-RateLimit-Limit: 60 X-RateLimit-Remaining: 45 X-RateLimit-Reset: 1640995200 Implement exponential backoff when hitting limits. Check remaining quota before bulk operations. ## 8. Error Handling APIs return standard HTTP status codes with detailed error messages: StatusMeaningCommon Causes400Bad RequestInvalid parameters, malformed JSON401UnauthorizedInvalid or missing API key403ForbiddenInsufficient permissions, plan limits404Not FoundQR code ID doesn't exist429Too Many RequestsRate limit exceeded500Server ErrorInternal API error ### Error Response Format { "error": { "code": "INVALID_PARAMETER", "message": "The 'color' parameter must be a valid hex color", "field": "color", "documentation": "https://docs.qrmommy.com/errors/INVALID_PARAMETER" } } ## 9. Webhooks and Callbacks Webhooks notify your application of events in real-time without polling: ### Common Webhook Events - qr.scanned - QR code was scanned - qr.created - New QR code created - qr.updated - QR code destination changed - qr.deleted - QR code was deleted - limit.approaching - Near usage limit ### Webhook Payload Example { "event": "qr.scanned", "timestamp": "2025-01-15T10:30:00Z", "data": { "qrCodeId": "qr_abc123", "scanId": "scan_xyz789", "location": { "country": "US", "city": "New York", "latitude": 40.7128, "longitude": -74.0060 }, "device": { "os": "iOS", "version": "17.2", "browser": "Safari" } }, "signature": "sha256=abc123..." } ## 10. Best Practices Follow these practices for reliable and efficient API integration: ### Security - - Store API keys in environment variables - - Use HTTPS for all requests - - Validate webhook signatures - - Implement key rotation - - Log access for auditing ### Performance - - Use bulk endpoints for multiple codes - - Cache responses where appropriate - - Implement retry logic with backoff - - Monitor rate limit headers - - Use webhooks instead of polling ### Reliability - - Handle all error codes gracefully - - Implement circuit breakers - - Set appropriate timeouts - - Log errors for debugging - - Test in staging before production ### Maintainability - - Use SDK/client libraries when available - - Abstract API calls into services - - Document integration points - - Version your integration code - - Monitor for API deprecations ## 11. Choosing a QR Code API Provider Consider these factors when selecting a QR code API: ### Features Checklist Dynamic QR code support Custom branding/logos Multiple QR code types Bulk generation Detailed analytics Webhook support Multiple export formats SDKs for your language ### Technical Considerations - Uptime SLA: Look for 99.9%+ availability guarantees - Latency: Sub-200ms response times for generation - Documentation: Comprehensive, with examples in multiple languages - Support: Response time guarantees, priority support for higher tiers - Compliance: GDPR, SOC 2, or industry-specific requirements ### Why Choose QR Mommy API QR Mommy offers a developer-friendly API with comprehensive features, competitive pricing, and excellent documentation. Create dynamic QR codes with full customization, track scans in real-time, and scale from prototype to production. Get API Access ## 12. Frequently Asked Questions Is there a free QR code API? Yes, most QR code APIs offer free tiers with limited features or monthly quotas. Free tiers are great for testing and small projects. For production use, paid plans provide higher limits, better support, and additional features. How do I test the API without writing code? Use tools like Postman or curl to make test requests. Most API providers also offer interactive documentation where you can test endpoints directly in the browser. Can I generate QR codes without an internet connection? Static QR codes can be generated offline using libraries like qrcode.js (JavaScript) or qrcode (Python). However, dynamic QR codes with tracking require an API for the redirect service. What's the best format for QR code images? Use SVG or PDF for print (vector formats scale without quality loss). Use PNG for digital display. Avoid JPEG as compression can affect scannability. How do I track which marketing channel drove scans? Create separate dynamic QR codes for each channel (print ad, billboard, product packaging) and use unique names or tags. Your analytics dashboard will show scans per code. Can I white-label the QR codes? Many enterprise API plans offer white-labeling where the short URL domain and branding can be customized. This removes any reference to the QR code provider. ## Ready to Integrate QR Codes into Your Application? Get started with QR Mommy's developer-friendly API. Comprehensive documentation, SDKs, and support to help you build. Get API KeyView Documentation ### Ready to Create Your Own QR Codes? Start generating professional QR codes with advanced analytics and customization. No credit card required. Get Started Free →Learn More Found this article helpful? Share it with your network!