Applying GraphQL to Backend with Node.js and PostgreSQL

What is GraphQL?

GraphQL is a query language for APIs and a runtime for executing those queries by using a type system you define for your data. It provides a more flexible and efficient alternative to REST APIs by enabling clients to request only the data they need, making it ideal for modern applications.

Key Features of GraphQL:

1. Single Endpoint: Instead of multiple endpoints, GraphQL uses a single endpoint to handle all queries and mutations.

2. Client-Defined Queries: Clients can specify exactly what data they need, reducing over-fetching or under-fetching.

3. Strongly Typed Schema: GraphQL APIs are defined by a schema that describes the types of data and relationships between them.

4. Real-Time Data: Supports subscriptions for real-time updates.

Here’s how to build a GraphQL API with Node.js and PostgreSQL:

1. Set Up Your Project:

• Initialize a Node.js project:

mkdir graphql-node-postgres
cd graphql-node-postgres
npm init -y

• Install dependencies:

npm install express graphql express-graphql pg prisma dotenv

2. Configure PostgreSQL

• Create a PostgreSQL database.
• Define your tables. Example SQL for a users…