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README.md

React Firebase Hooks - Cloud Firestore

React Firebase Hooks provides convenience listeners for Collections and Documents stored with Cloud Firestore. The hooks wrap around the firestore.onSnapshot(...) method.

In addition to returning the snapshot value, the hooks provide an error and loading property to give a complete lifecycle for loading and listening to Cloud Firestore.

There are 2 variants of each hook:

  • useX which subscribes to the underlying Collection or Document and listens for changes
  • useXOnce which reads the current value of the Collection or Document

All hooks can be imported from react-firebase-hooks/firestore, e.g.

import { useCollection } from 'react-firebase-hooks/firestore';

List of Cloud Firestore hooks:

Additional functionality:

useCollection

const [snapshot, loading, error] = useCollection(query, options);

Retrieve and monitor a collection value in Cloud Firestore.

Returns a firestore.QuerySnapshot (if a query is specified), a boolean to indicate if the data is still being loaded and any firestore.FirestoreError returned by Firebase when trying to load the data.

The useCollection hook takes the following parameters:

  • query: (optional) firestore.Query for the data you would like to load
  • options: (optional) Object with the following parameters:
    • snapshotListenOptions: (optional) firestore.SnapshotListenOptions to customise how the query is loaded

Returns:

  • snapshot: a firestore.QuerySnapshot, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error

Full example

import { getFirestore, collection } from 'firebase/firestore';
import { useCollection } from 'react-firebase-hooks/firestore';

const FirestoreCollection = () => {
  const [value, loading, error] = useCollection(
    collection(getFirestore(firebaseApp), 'hooks'),
    {
      snapshotListenOptions: { includeMetadataChanges: true },
    }
  );
  return (
    <div>
      <p>
        {error && <strong>Error: {JSON.stringify(error)}</strong>}
        {loading && <span>Collection: Loading...</span>}
        {value && (
          <span>
            Collection:{' '}
            {value.docs.map((doc) => (
              <React.Fragment key={doc.id}>
                {JSON.stringify(doc.data())},{' '}
              </React.Fragment>
            ))}
          </span>
        )}
      </p>
    </div>
  );
};

useCollectionOnce

const [snapshot, loading, error] = useCollectionOnce(query, options);

Retrieve the current value of the firestore.Query.

The useCollectionOnce hook takes the following parameters:

  • query: (optional) firestore.Query for the data you would like to load
  • options: (optional) Object with the following parameters:
    • getOptions: (optional) Object to customise how the collection is loaded
      • source: (optional): 'default' | 'server' | 'cache' Describes whether we should get from server or cache.

Returns:

  • snapshot: a firestore.QuerySnapshot, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error
  • reload(): a function that can be called to trigger a reload of the data

useCollectionData

const [values, loading, error, snapshot] =
  useCollectionData < T > (query, options);

As useCollection, but this hook extracts a typed list of the firestore.QuerySnapshot.docs values, rather than the firestore.QuerySnapshot itself.

The useCollectionData hook takes the following parameters:

  • query: (optional) firestore.Query for the data you would like to load
  • options: (optional) Object with the following parameters:
    • initialValue: (optional) the initial value returned by the hook, until data from the firestore query has loaded
    • snapshotListenOptions: (optional) firestore.SnapshotListenOptions to customise how the collection is loaded
    • snapshotOptions: (optional) firestore.SnapshotOptions to customise how data is retrieved from snapshots

Returns:

  • values: an array of T, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error
  • snapshot: a firestore.QuerySnapshot, or undefined if no query is supplied. This allows access to the underlying snapshot if needed for any reason, e.g. to view the snapshot metadata

See Transforming data for how to transform data as it leaves Firestore and access the underlying id and ref fields of the snapshot.

useCollectionDataOnce

const [values, loading, error, snapshot] =
  useCollectionDataOnce < T > (query, options);

As useCollectionData, but this hook will only read the current value of the firestore.Query.

The useCollectionDataOnce hook takes the following parameters:

  • query: (optional) firestore.Query for the data you would like to load
  • options: (optional) Object with the following parameters:
    • getOptions: (optional) Object to customise how the collection is loaded
      • source: (optional): 'default' | 'server' | 'cache' Describes whether we should get from server or cache.
    • initialValue: (optional) the initial value returned by the hook, until data from the firestore query has loaded
    • snapshotOptions: (optional) firestore.SnapshotOptions to customise how data is retrieved from snapshots

Returns:

  • values: an array of T, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error
  • snapshot: a firestore.QuerySnapshot, or undefined if no query is supplied. This allows access to the underlying snapshot if needed for any reason, e.g. to view the snapshot metadata
  • reload(): a function that can be called to trigger a reload of the data

See Transforming data for how to transform data as it leaves Firestore and access the underlying id and ref fields of the snapshot.

useDocument

const [snapshot, loading, error] = useDocument(reference, options);

Retrieve and monitor a document value in Cloud Firestore.

The useDocument hook takes the following parameters:

  • reference: (optional) firestore.DocumentReference for the data you would like to load
  • options: (optional) Object with the following parameters:
    • snapshotListenOptions: (optional) firestore.SnapshotListenOptions to customise how the query is loaded

Returns:

  • snapshot: a firestore.DocumentSnapshot, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error

Full example

import { getFirestore, doc } from 'firebase/firestore';
import { useDocument } from 'react-firebase-hooks/firestore';

const FirestoreDocument = () => {
  const [value, loading, error] = useDocument(
    doc(getFirestore(firebaseApp), 'hooks', 'nBShXiRGFAhuiPfBaGpt'),
    {
      snapshotListenOptions: { includeMetadataChanges: true },
    }
  );
  return (
    <div>
      <p>
        {error && <strong>Error: {JSON.stringify(error)}</strong>}
        {loading && <span>Document: Loading...</span>}
        {value && <span>Document: {JSON.stringify(value.data())}</span>}
      </p>
    </div>
  );
};

useDocumentOnce

const [snapshot, loading, error, reload] = useDocumentOnce(reference, options);

Retrieve the current value of the firestore.DocumentReference.

The useDocumentOnce hook takes the following parameters:

  • reference: (optional) firestore.DocumentReference for the data you would like to load
  • options: (optional) Object with the following parameters:
    • getOptions: (optional) Object to customise how the collection is loaded
      • source: (optional): 'default' | 'server' | 'cache' Describes whether we should get from server or cache.

Returns:

  • snapshot: a firestore.DocumentSnapshot, or undefined if no reference is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error
  • reload(): a function that can be called to trigger a reload of the data

useDocumentData

const [value, loading, error, snapshot] =
  useDocumentData < T > (reference, options);

As useDocument, but this hook extracts the typed contents of firestore.DocumentSnapshot.data(), rather than the firestore.DocumentSnapshot itself.

The useDocumentData hook takes the following parameters:

  • reference: (optional) firestore.DocumentReference for the data you would like to load
  • options: (optional) Object with the following parameters:
    • initialValue: (optional) the initial value returned by the hook, until data from the firestore query has loaded
    • snapshotListenOptions: (optional) firestore.SnapshotListenOptions to customise how the collection is loaded
    • snapshotOptions: (optional) firestore.SnapshotOptions to customise how data is retrieved from snapshots

Returns:

  • value: T, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error
  • snapshot: a firestore.DocumentSnapshot, or undefined if no query is supplied. This allows access to the underlying snapshot if needed for any reason, e.g. to view the snapshot metadata

See Transforming data for how to transform data as it leaves Firestore and access the underlying id and ref fields of the snapshot.

useDocumentDataOnce

const [value, loading, error, snapshot, reload] =
  useDocumentDataOnce < T > (reference, options);

As useDocument, but this hook will only read the current value of the firestore.DocumentReference.

The useDocumentDataOnce hook takes the following parameters:

  • reference: (optional) firestore.DocumentReference for the data you would like to load
  • options: (optional) Object with the following parameters:
    • getOptions: (optional) Object to customise how the collection is loaded
      • source: (optional): 'default' | 'server' | 'cache' Describes whether we should get from server or cache
    • initialValue: (optional) the initial value returned by the hook, until data from the firestore query has loaded
    • snapshotOptions: (optional) firestore.SnapshotOptions to customise how data is retrieved from snapshots

Returns:

  • value: T, or undefined if no query is supplied
  • loading: a boolean to indicate if the data is still being loaded
  • error: Any firestore.FirestoreError returned by Firebase when trying to load the data, or undefined if there is no error
  • snapshot: a firestore.DocumentSnapshot, or undefined if no query is supplied. This allows access to the underlying snapshot if needed for any reason, e.g. to view the snapshot metadata
  • reload(): a function that can be called to trigger a reload of the data

See Transforming data for how to transform data as it leaves Firestore and access the underlying id and ref fields of the snapshot.

Transforming data

Firestore allows a restricted number of data types in its store, which may not be flexible enough for your application. As of Firebase 9, there is a built in FirestoreDataConverter which allows you to transform data as it leaves the Firestore database, as well as access the id and ref fields of the underlying snapshot. This is described here: https://firebase.google.com/docs/reference/js/firestore_.firestoredataconverter

NOTE: This replaces the transform, idField and refField options that were available in react-firebase-hooks v4 and earlier.

Example

type Post = {
  author: string,
  id: string,
  ref: DocumentReference<DocumentData>,
  title: string,
};

const postConverter: FirestoreDataConverter<Post> = {
  toFirestore(post: WithFieldValue<Post>): DocumentData {
    return { author: post.author, title: post.title };
  },
  fromFirestore(
    snapshot: QueryDocumentSnapshot,
    options: SnapshotOptions
  ): Post {
    const data = snapshot.data(options);
    return {
      author: data.author,
      id: snapshot.id,
      ref: snapshot.ref,
      title: data.title,
    };
  },
};

const ref = collection(firestore, 'posts').withConverter(postConverter);
const [data, loading, error] = useCollectionData(ref);