Learn how to use GraphiQL with Firebase Auth on Codementor

GraphiQL is a powerful tool that allows developers to interact with GraphQL APIs in a user-friendly way. It provides an interface where you can write queries, explore the schema, and test your API endpoints. In this article, we will learn how to use GraphiQL with Firebase Auth on Codementor.

Firebase Auth is a service provided by Google that allows developers to easily add authentication and user management to their applications. It provides various authentication methods like email/password, Google Sign-In, Facebook Login, and more. By integrating Firebase Auth with GraphiQL, you can test your GraphQL API endpoints with authenticated requests.

To get started, you will need to have a Firebase project set up and configured. If you haven’t done so already, head over to the Firebase console (https://console.firebase.google.com/) and create a new project. Once your project is set up, you will need to enable Firebase Auth and configure the authentication methods you want to use.

Next, you will need to install the necessary dependencies. GraphiQL is typically used as a web-based tool, so you will need a web server to host it. You can use any web server of your choice, but for simplicity, we will use Express.js in this example. Open your terminal and navigate to your project directory. Run the following command to install Express.js:

“`

npm install express

“`

Once Express.js is installed, create a new file called `server.js` in your project directory. Open the file and add the following code:

“`javascript

const express = require(‘express’);

const { graphqlHTTP } = require(‘express-graphql’);

const { buildSchema } = require(‘graphql’);

// Define your GraphQL schema here

const schema = buildSchema(`

type Query {

hello: String

}

`);

// Define your resolvers here

const root = {

hello: () => ‘Hello, world!’,

};

const app = express();

// Set up the GraphQL endpoint

app.use(

‘/graphql’,

graphqlHTTP({

schema: schema,

rootValue: root,

graphiql: true,

})

);

// Start the server

app.listen(3000, () => {

console.log(‘Server started on port 3000’);

});

“`

In this code, we define a simple GraphQL schema with a single query called `hello`. We also define a resolver function for the `hello` query that returns the string “Hello, world!”. The server is set up to listen on port 3000 and enable GraphiQL by setting the `graphiql` option to `true`.

Now, let’s integrate Firebase Auth with GraphiQL. First, install the necessary Firebase dependencies by running the following command:

“`

npm install firebase-admin

“`

Once Firebase Admin SDK is installed, open `server.js` again and add the following code at the top of the file:

“`javascript

const admin = require(‘firebase-admin’);

// Initialize Firebase Admin SDK

admin.initializeApp({

credential: admin.credential.applicationDefault(),

});

“`

This code initializes the Firebase Admin SDK using the default application credentials. This allows your server to authenticate requests using Firebase Auth.

Next, update the resolver function for the `hello` query to include authentication. Replace the existing `root` object with the following code:

“`javascript

const root = {

hello: (args, context) => {

// Check if user is authenticated

if (!context.user) {

throw new Error(‘Unauthorized’);

}

// Access the authenticated user’s ID

const userId = context.user.uid;

// Your logic here

return ‘Hello, world!’;

},

};

“`

In this code, we check if the `user` property exists in the `context` object. If it doesn’t, we throw an error indicating that the user is unauthorized. If the user is authenticated, we can access their unique ID using `context.user.uid`. You can use this ID to perform any necessary operations or validations.

Finally, start the server again by running the following command:

“`

node server.js

“`

You should see a message indicating that the server has started on port 3000. Open your web browser and navigate to `http://localhost:3000/graphql`. You should see the GraphiQL interface.

To test authenticated requests, you will need to obtain a Firebase ID token. You can do this by signing in with one of the authentication methods you configured in your Firebase project. Once you have an ID token, click on the “HTTP HEADERS” tab in GraphiQL and add the following header:

“`

{

“Authorization”: “Bearer “

}

“`

Replace “ with the actual ID token you obtained. Now, you can write queries and test your API endpoints with authenticated requests.

In this article, we learned how to use GraphiQL with Firebase Auth on Codementor

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