Serverless Computing and GraphQL: Modern App Development

In this article, I walk you through, creating a serverless GraphQL API using TypeScript, AWS Lambda, and Apollo Server.

Serverless computing:

It is a cloud-computing execution model where cloud providers automatically manage the infrastructure for running applications. In this model, developers write code, and the cloud provider takes care of running, scaling, and maintaining the servers, meaning developers don't need to worry about server management, infrastructure provisioning, or scaling. The term "serverless" doesn't mean that there are no servers involved, but rather that the server management tasks are abstracted away from developers. AWS Lambda is a serverless compute service provided by Amazon Web Services (AWS) that allows you to run code without provisioning or managing servers

GraphQL:

It is a query language for APIs and a runtime for executing those queries. It allows clients to request exactly the data they need, making it more efficient compared to REST, which may over-fetch or under-fetch data. With GraphQL, clients specify the shape and structure of the response, retrieving multiple resources in a single request. This flexibility improves performance and reduces network overhead. GraphQL is strongly typed, with a schema defining available types and operations. It’s widely used in modern applications to optimize communication between the frontend and backend, enabling more responsive and efficient data management.

Apollo Server:

It is a popular, open-source GraphQL server that helps developers create a GraphQL API with ease. It simplifies the process of building a robust and scalable GraphQL API by handling schema definition, query execution, and response formatting. Apollo Server supports features like data fetching, caching, and authentication, making it highly adaptable for modern applications. It works seamlessly with various data sources, including REST APIs, databases, and microservices. With built-in tools for performance monitoring and error handling, Apollo Server is commonly used to streamline backend development, providing efficient and flexible communication between clients and servers in GraphQL environments.

Why TypeScript?

It is a superset of JavaScript that adds static typing to the language. It helps catch errors during development, improves code readability, and enhances refactoring. By providing type safety and tooling support, TypeScript enables more maintainable and scalable applications, making it ideal for large projects or teams.

Why I find Serverless and GraphQL to Work So Well Together (or: A Love Story in Code)

• Optimized Resource Usage: GraphQL's precise data fetching aligns perfectly with serverless' pay-per-use model, ensuring efficient resource utilization.

• Simplified Backend: Serverless functions can handle GraphQL resolvers efficiently, streamlining the backend architecture.

• Improved Performance: GraphQL's ability to reduce data overhead translates to faster applications, especially when combined with serverless architecture.

• Scalability: Both technologies excel at handling varying loads, making the combination highly scalable.

• Cost-Effective: The pay-as-you-go model of serverless computing, coupled with GraphQL's efficient data transfer, can lead to significant cost savings.

Below are the step by step guide to deploy a service with graphQL in AWS lambda.

1.Initialize a new TypeScript project and install dependencies

``
mkdir serverless-graphql-api

cd serverless-graphql-api

npm init -y

npm install typescript @types/node --save-dev

npx tsc --init

npm install apollo-server-lambda graphql @types/aws-lambda

npm install --save-dev serverless-offline
``

2.Define the GraphQL Schema with the necessary elements.

``
import { gql } from 'apollo-server-lambda';

export const typeDefs = gql`
type Query {
auto: String
}

type Mutation {
sayAuto(name: String!): String
}
;
`

3.Implementing Resolvers

export const resolvers = {
  Query: {
    auto: () => 'Hello from serverless GraphQL!',
  },
  Mutation: {
    sayAuto: (_: any, { name }: { name: string }) => `Hello, ${name}!`,
  },
};

4.Creating the Lambda Handler

import { ApolloServer } from 'apollo-server-lambda';
import { typeDefs } from './schema';
import { resolvers } from './resolvers';

const server = new ApolloServer({
typeDefs,
resolvers,
});
export const graphqlHandler = server.createHandler();

You can write the code directly to lambda in AWS(Quick hello world) and use proper deploy options like CDK or terraform. As both serverless computing and GraphQL continue to evolve, we can expect even more powerful tools and practices to emerge.

By embracing serverless GraphQL, developers can create APIs that scale effortlessly and deliver precisely what clients need. It's like having a crystal ball that always knows exactly what data to fetch and scale.