Error Handling in Shopify GraphQL API

1. Introduction
   • Importance of robust error handling in API integration
   • Overview of error handling in GraphQL
2. Understanding GraphQL Errors
   • Types of errors in GraphQL (syntax, validation, execution)
   • How Shopify GraphQL API communicates errors
3. Setting Up Your Node.js Environment
   • Installing Node.js and Shopify’s GraphQL API library
   • Configuring your Shopify API credentials
4. Basic Error Handling Techniques
   • Detecting and logging errors
   • Node.js code example: Basic error detection and response
5. Handling Specific Shopify GraphQL Errors
   • Common Shopify GraphQL errors and their meanings
   • Strategies for handling specific errors (like rate limit errors, data validation errors)
6. Advanced Error Handling Patterns
   • Using error handling libraries (like Apollo Client)
   • Implementing error boundaries in your application logic
7. Designing Error Responses for Frontend Applications
   • Structuring error messages for user interfaces
   • Node.js code example: Sending user-friendly error responses
8. Automating Error Monitoring and Reporting
   • Tools and services for error tracking (e.g., Sentry, New Relic)
   • Setting up automated error reporting in Node.js
9. Best Practices for Error Handling
   • Error handling best practices in GraphQL
   • Preventing errors before they occur (input validation, query optimization)
10. Testing Error Handling
    • Writing tests to ensure your error handling works as expected
    • Node.js code example: Testing error handling with Jest
11. Real-World Scenarios and Case Studies
    • Examples of effective error handling in commercial applications
    • Learning from past errors: case studies
12. Conclusion
    • Recap of the importance of effective error handling
    • Encouragement to continuously improve error handling practices

const { Shopify } = require('@shopify/shopify-api');

const shop = 'your-shop-name.myshopify.com';
const accessToken = 'your-access-token';

const client = new Shopify.Clients.Graphql(shop, accessToken);

async function fetchProduct(productId) {
  const query = `
  {
    product(id: "gid://shopify/Product/${productId}") {
      id
      title
    }
  }`;

  try {
    const response = await client.query({ data: query });
    console.log('Product Details:', response);
  } catch (error) {
    console.error('GraphQL Error:', error);
    if (error.response && error.response.errors) {
      error.response.errors.forEach(err => {
        console.log(`Error Message: ${err.message}`);
        // Handle specific error types here
      });
    }
  }
}

fetchProduct('123456789');