GraphQL API with Apollo Server, Express.js, and Database Integration

GraphQL is a powerful query language for APIs that allows clients to request exactly the data they need. When combined with Apollo Server, Express.js, and MongoDB, you can build a flexible, performant, and secure backend for modern applications. Integrating Role-Based Access Control (RBAC) and Authorization ensures fine-grained access control, while DataLoader helps avoid the N+1 query problem common in GraphQL.

This guide walks you through setting up a robust GraphQL API using:

• Apollo Server for building the GraphQL layer
• Express.js for middleware and server handling
• MongoDB for data persistence
• RBAC and Authorization for secure access control, together with GraphQL Shield
• DataLoader for batching and caching database queries efficiently