npm install -g @angular\/cli\n<\/code><\/pre>\nTo set up the GraphQL server, we will use Apollo Server. Apollo Server is an open-source GraphQL server that works with any GraphQL schema. You can install it by running the following command:<\/p>\n
npm install apollo-server graphql\n<\/code><\/pre>\nSetting up the GraphQL Server<\/h2>\n
Before we start working with Angular, let’s set up our GraphQL server using Apollo Server. Create a new folder for your project and navigate to it in your terminal. Then, run the following command to initialize a new Node.js project:<\/p>\n
npm init -y\n<\/code><\/pre>\nNext, create a file named server.js<\/code> and open it in your favorite code editor. In this file, we will set up our GraphQL server using Apollo Server.<\/p>\nFirst, import the necessary modules:<\/p>\n
const { ApolloServer, gql } = require('apollo-server');\n<\/code><\/pre>\nNext, define your GraphQL schema. This schema describes the available queries and types in your API. In this example, we will create a simple schema with a greeting<\/code> query that returns a string:<\/p>\nconst typeDefs = gql`\n type Query {\n greeting: String\n }\n`;\n<\/code><\/pre>\nThen, define the resolver functions for your schema. These functions define how to fetch the data for each query. In this case, we will return a static string for the greeting<\/code> query:<\/p>\nconst resolvers = {\n Query: {\n greeting: () => 'Hello, world!',\n },\n};\n<\/code><\/pre>\nNow, create an instance of ApolloServer<\/code> and pass in your schema and resolvers:<\/p>\nconst server = new ApolloServer({ typeDefs, resolvers });\n<\/code><\/pre>\nFinally, start the server by calling the listen<\/code> method:<\/p>\nserver.listen().then(({ url }) => {\n console.log(`Server running at ${url}`);\n});\n<\/code><\/pre>\nYour server.js<\/code> file should now look like this:<\/p>\nconst { ApolloServer, gql } = require('apollo-server');\n\nconst typeDefs = gql`\n type Query {\n greeting: String\n }\n`;\n\nconst resolvers = {\n Query: {\n greeting: () => 'Hello, world!',\n },\n};\n\nconst server = new ApolloServer({ typeDefs, resolvers });\n\nserver.listen().then(({ url }) => {\n console.log(`Server running at ${url}`);\n});\n<\/code><\/pre>\nSave the file and run the following command in your terminal to start the GraphQL server:<\/p>\n
node server\n<\/code><\/pre>\nYou should see a message indicating that the server is running at a specific URL (e.g., `http:\/\/localhost:4000`). Keep this URL handy as we will need it later.<\/p>\n
Creating an Angular Project<\/h2>\n
Now that our GraphQL server is up and running, let’s create a new Angular project to consume the API.<\/p>\n
Open a new terminal window, navigate to the desired directory, and run the following command to generate a new Angular project:<\/p>\n
ng new angular-graphql-demo\n<\/code><\/pre>\nFollow the prompts to customize your project, and then navigate to the project directory:<\/p>\n
cd angular-graphql-demo\n<\/code><\/pre>\nInstalling Required Dependencies<\/h2>\n
Next, we need to install some dependencies to work with GraphQL in Angular. First, install the Apollo Angular package, which provides integration for Apollo Client with Angular:<\/p>\n
npm install @apollo\/client graphql\n<\/code><\/pre>\nThis package includes both the Apollo Client library and the GraphQL query language package.<\/p>\n
Configuring Apollo Client<\/h2>\n
To use Apollo Client in our Angular project, we need to configure it with the URL of our GraphQL server.<\/p>\n
Open src\/app\/app.module.ts<\/code> in your code editor, and import the required modules:<\/p>\nimport { ApolloClient, InMemoryCache, HttpLink } from '@apollo\/client';\nimport { ApolloModule } from 'apollo-angular';\nimport { NgModule } from '@angular\/core';\nimport { BrowserModule } from '@angular\/platform-browser';\nimport { AppComponent } from '.\/app.component';\n<\/code><\/pre>\nThen, create an Apollo Client instance with the URL of your GraphQL server:<\/p>\n
const uri = 'http:\/\/localhost:4000'; \/\/ Replace this with your server URL\n\n@NgModule({\n declarations: [AppComponent],\n imports: [\n BrowserModule,\n ApolloModule,\n ],\n providers: [],\n bootstrap: [AppComponent],\n})\nexport class AppModule {\n constructor(apollo: ApolloClient<unknown>) {\n apollo\n .create({\n link: new HttpLink({ uri }),\n cache: new InMemoryCache(),\n });\n }\n}\n<\/code><\/pre>\nNext, remove the default AppComponent from the app.component.ts<\/code> file and replace it with a new component for our GraphQL demo.<\/p>\nBuilding the GraphQL Component<\/h2>\n
Create a new file named graphql.component.ts<\/code> in the src\/app<\/code> directory, and add the following code to define your component:<\/p>\nimport { Component, OnInit } from '@angular\/core';\n\n@Component({\n selector: 'app-graphql',\n template: `\n <div>\n <h2>Greeting<\/h2>\n {{ greeting }}\n <\/div>\n `,\n})\nexport class GraphqlComponent implements OnInit {\n greeting: string;\n\n constructor() {}\n\n ngOnInit() {}\n}\n<\/code><\/pre>\nThis component simply displays the result of the greeting<\/code> query we defined earlier.<\/p>\nGenerating GraphQL Code<\/h2>\n
To consume the GraphQL server, we need to generate TypeScript types for our queries and mutations.<\/p>\n
Open your terminal, navigate to the Angular project root directory, and run the following command:<\/p>\n
ng generate apollo:components\n<\/code><\/pre>\nThis command generates a graphql.ts<\/code> file in the src\/app<\/code> directory.<\/p>\nWriting GraphQL Queries<\/h2>\n
Open the graphql.ts<\/code> file in your code editor and modify it as follows:<\/p>\nimport { gql } from 'apollo-angular';\n\nexport const GREETING_QUERY = gql`\n query GetGreeting {\n greeting\n }\n`;\n<\/code><\/pre>\nHere, we define our GraphQL query using the gql<\/code> template tag provided by the apollo-angular<\/code> package. The GetGreeting<\/code> query requests the greeting<\/code> field from the server.<\/p>\nConsuming the GraphQL API<\/h2>\n
Open src\/app\/graphql.component.ts<\/code> in your code editor and update the code as follows:<\/p>\nimport { Component, OnInit } from '@angular\/core';\nimport { Apollo } from 'apollo-angular';\nimport { GREETING_QUERY } from '.\/graphql';\n\n@Component({\n selector: 'app-graphql',\n template: `\n <div>\n <h2>Greeting<\/h2>\n {{ greeting }}\n <\/div>\n `,\n})\nexport class GraphqlComponent implements OnInit {\n greeting: string;\n\n constructor(private apollo: Apollo) {}\n\n ngOnInit() {\n this.apollo\n .watchQuery<any>({\n query: GREETING_QUERY,\n })\n .valueChanges.subscribe(({ data }) => {\n this.greeting = data.greeting;\n });\n }\n}\n<\/code><\/pre>\nIn this code, we import the Apollo<\/code> service from apollo-angular<\/code> and the GREETING_QUERY<\/code> we defined earlier. In the ngOnInit<\/code> method, we use the watchQuery<\/code> method to execute the GREETING_QUERY<\/code> and subscribe to the result. When the query completes, we update the greeting<\/code> property with the returned value.<\/p>\nUpdating the App Component<\/h2>\n
Open src\/app\/app.component.ts<\/code> in your code editor and update the code as follows:<\/p>\nimport { Component } from '@angular\/core';\n\n@Component({\n selector: 'app-root',\n template: `\n <app-graphql><\/app-graphql>\n `,\n})\nexport class AppComponent {}\n<\/code><\/pre>\nWe simply remove the default content and add our app-graphql<\/code> component.<\/p>\nUpdating the App Module<\/h2>\n
Open src\/app\/app.module.ts<\/code> in your code editor and update the imports as follows:<\/p>\nimport { HttpClientModule } from '@angular\/common\/http';\n<\/code><\/pre>\nThen, add the HttpClientModule<\/code> to the imports<\/code> array:<\/p>\nimports: [\n BrowserModule,\n ApolloModule,\n HttpClientModule,\n],\n<\/code><\/pre>\nThis module enables the Apollo<\/code> service to make HTTP requests.<\/p>\nRunning the Application<\/h2>\n
Now that we have configured everything, let’s start the Angular development server and see the results.<\/p>\n
In your terminal, navigate to the project directory and run the following command to start the Angular development server:<\/p>\n
ng serve\n<\/code><\/pre>\nOpen your browser and navigate to `http:\/\/localhost:4200`. You should see the greeting message from the server rendered in the browser.<\/p>\n
Congratulations! You have successfully built an Angular application that consumes a GraphQL API.<\/p>\n
Conclusion<\/h2>\n
In this tutorial, we learned how to use GraphQL with Angular. We created a GraphQL server using Apollo Server, configured an Angular application to consume the server, generated TypeScript types for our queries, and consumed the GraphQL API using Apollo Client. By combining Angular and GraphQL, you can build efficient and flexible APIs that meet the specific data needs of your clients.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this tutorial, we will learn how to use GraphQL with Angular. Angular is a popular framework for building web applications, and GraphQL is a query language and runtime for APIs. By combining these technologies, we can create efficient and flexible APIs that allow clients to request exactly the data Continue Reading<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[1812,1809,1810,1808,1811,1807],"yoast_head":"\nHow to Use GraphQL with Angular - Pantherax Blogs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/localhost:10003\/how-to-use-graphql-with-angular\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use GraphQL with Angular\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, we will learn how to use GraphQL with Angular. 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