To use multiple fields in Firestore, you first need to create a Firestore database and a collection. Then you can create documents within that collection and add multiple fields to each document.

Here's an example of how to add multiple fields to a Firestore document using the Firebase Admin SDK for Node.js:

const serviceAccount = require('./path/to/serviceAccountKey.json');

  credential: admin.credential.cert(serviceAccount)

const docRef = db.collection('users').doc('user1');

  console.log('Document successfully written!');

  console.error('Error writing document: ', error);

In this example, we're creating a document in the "users" collection with the ID "user1". We're also adding three fields to the document: "name", "age", and "email". The set() method is used to add the data to the document.

You can repeat this process to create multiple documents with multiple fields in your Firestore database. You can also query the database to retrieve documents that match specific criteria based on their fields.

Firestore also provides various data types for fields, such as strings, numbers, arrays, and maps. You can use these data types to store and retrieve complex data structures within your Firestore documents.

Add an array field to a Firestore document using the Firebase Web SDK:

Here's an example of how to add an array field to a Firestore document using the Firebase Web SDK:

  interests: ['hiking', 'reading', 'traveling']

In this example, we've added an "interests" field to the Firestore document, which is an array of strings. You can also use arrays to store other data types, such as numbers or objects.

To retrieve documents that match specific criteria based on their fields, you can use Firestore queries. Here's an example of how to query for all documents in the "users" collection that have an "age" field greater than or equal to 25:

const query = db.collection('users').where('age', '>=', 25);

    console.log(doc.id, ' => ', doc.data());

  console.error('Error getting documents: ', error);

In this example, we've used the where() method to create a query that filters documents based on their "age" field. The get() method is then used to retrieve the documents that match the query. You can also order the results or limit the number of documents returned by the query.

Using multiple fields in the Firestore, let's discuss how to do it.

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