To create a GraphQL Node.js and Firebase functions API with TypeScript and Yarn to post and get blog posts for users, follow these steps:
Install the necessary dependencies using Yarn. This includes the GraphQL and Firebase dependencies, as well as TypeScript and any other necessary libraries:
yarn add graphql apollo-server-express firebase-admin @types/graphql @types/firebase-admin
Create a new file called server.ts and import the necessary libraries:
import { ApolloServer } from 'apollo-server-express';
import { FirebaseAdmin, Firestore } from 'firebase-admin';
import { buildFederatedSchema } from '@apollo/federation';
Initialize the Firebase app and connect to the Firestore database:
const firebaseApp = FirebaseAdmin.initializeApp({
credential: FirebaseAdmin.credential.cert(serviceAccount),
databaseURL: "https://<DATABASE_NAME>.firebaseio.com"
});
const firestore = firebaseApp.firestore();
Define the GraphQL schema for the blog post type, including fields for the title, content, and author:
const typeDefs = gql`
type BlogPost {
id: ID!
title: String!
content: String!
author: String!
}
type Query {
blogPosts: [BlogPost]
}
type Mutation {
createBlogPost(title: String!, content: String!, author: String!): BlogPost
}
`;
Implement the resolvers for the GraphQL queries and mutations. These will be used to fetch and store data in the Firestore database:
const resolvers = {
Query: {
blogPosts: async () => {
const blogPostSnapshot = await firestore.collection('blog_posts').get();
return blogPostSnapshot.docs.map((doc) => doc.data());
}
},
Mutation: {
createBlogPost: async (parent, args) => {
const { title, content, author } = args;
const blogPost = {
title,
content,
author
};
const blogPostRef = await firestore.collection('blog_posts').add(blogPost);
return {
...blogPost,
id: blogPostRef.id
};
}
}
};
Create the Apollo server and pass in the schema and resolvers. Also, enable the GraphQL Playground for testing:
const server = new ApolloServer({
schema: buildFederatedSchema([{ typeDefs, resolvers }]),
playground: true
});
Create the Firebase function that will handle requests to the GraphQL API. This function will be triggered when a user makes a request to the API endpoint:
exports.graphql = functions.https.onRequest(server);
Test the API using the GraphQL Playground. You should be able to create and fetch blog posts using the provided queries and mutations.
With these steps, we have created a minimal GraphQL API with firebase functions and Nodejs. Next we will add more functionalities to the API
Watch out for the next Article in the series.
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