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Hooks

Apollo Client react hooks API reference


Installation

Apollo Client >= 3 includes React hooks functionality out of the box. You don't need to install any additional packages.

The ApolloProvider component

The ApolloProvider component leverages React's Context API to make a configured Apollo Client instance available throughout a React component tree. This component can be imported directly from the @apollo/client package.

import { ApolloProvider } from '@apollo/client';

Props

OptionTypeDescription
clientApolloClient<TCache>An ApolloClient instance.

Example

const client = new ApolloClient({
  cache: new InMemoryCache(),
  uri: "http://localhost:4000/graphql"
});

ReactDOM.render(
  <ApolloProvider client={client}>    <MyRootComponent />  </ApolloProvider>,  document.getElementById('root'),
);

The ApolloConsumer component

One way to access the configured Apollo Client instance directly is to create an ApolloConsumer component and provide a render prop function as its child. The render prop function will be called with your ApolloClient instance as its only argument. You can think of the ApolloConsumer component as similar to the Consumer component from the React Context API.

Example

import React from 'react';
import { ApolloConsumer } from '@apollo/client';

const WithApolloClient = () => (
  <ApolloConsumer>
    {client => 'We have access to the client!' /* do stuff here */}
  </ApolloConsumer>
);

useQuery

Example

import { gql, useQuery } from '@apollo/client';

const GET_GREETING = gql`
  query GetGreeting($language: String!) {
    greeting(language: $language) {
      message
    }
  }
`;

function Hello() {
  const { loading, error, data } = useQuery(GET_GREETING, {
    variables: { language: 'english' },
  });
  if (loading) return <p>Loading ...</p>;
  return <h1>Hello {data.greeting.message}!</h1>;
}

Refer to the Queries section for a more in-depth overview of useQuery.

Function Signature

function useQuery<TData = any, TVariables = OperationVariables>(
  query: DocumentNode,
  options?: QueryHookOptions<TData, TVariables>,
): QueryResult<TData, TVariables> {}

Params

query

ParamTypeDescription
queryDocumentNodeA GraphQL query document parsed into an AST by gql.

options

Name /
Type
Description

Operation options

query

DocumentNode

A GraphQL query string parsed into an AST with the gql template literal.

Optional for the useQuery hook, because the query can be provided as the first parameter to the hook. Required for the Query component.

variables

{ [key: string]: any }

An object containing all of the GraphQL variables your query requires to execute.

Each key in the object corresponds to a variable name, and that key's value corresponds to the variable value.

errorPolicy

ErrorPolicy

Specifies how the query handles a response that returns both GraphQL errors and partial results.

For details, see GraphQL error policies.

The default value is none, meaning that the query result includes error details but not partial results.

onCompleted

(data: TData | {}) => void

A callback function that's called when your query successfully completes with zero errors (or if errorPolicy is ignore and partial data is returned).

This function is passed the query's result data.

onError

(error: ApolloError) => void

A callback function that's called when the query encounters one or more errors (unless errorPolicy is ignore).

This function is passed an ApolloError object that contains either a networkError object or a graphQLErrors array, depending on the error(s) that occurred.

skip

boolean

If true, the query is not executed. Not available with useLazyQuery.

This property is part of Apollo Client's React integration, and it is not available in the core ApolloClient API.

The default value is false.

displayName

string

The name of your component to be displayed in the React Developer Tools.

The default value is Query.

Networking options

pollInterval

number

Specifies the interval (in milliseconds) at which the query polls for updated results.

The default value is 0 (no polling).

notifyOnNetworkStatusChange

boolean

If true, the in-progress query's associated component re-renders whenever the network status changes or a network error occurs.

The default value is false.

context

Record<string, any>

If you're using Apollo Link, this object is the initial value of the context object that's passed along your link chain.

ssr

boolean

Pass false to skip executing the query during server-side rendering.

client

ApolloClient

The instance of ApolloClient to use to execute the query.

By default, the instance that's passed down via context is used, but you can provide a different instance here.

Caching options

fetchPolicy

FetchPolicy

Specifies how the query interacts with the Apollo Client cache during execution (for example, whether it checks the cache for results before sending a request to the server).

For details, see Setting a fetch policy.

The default value is cache-first.

nextFetchPolicy

FetchPolicy

Specifies the fetchPolicy to use for all executions of this query after this execution.

For example, you can use this to switch back to a cache-first fetch policy after using cache-and-network or network-only for a single execution.

returnPartialData

boolean

If true, the query can return partial results from the cache if the cache doesn't contain results for all queried fields.

The default value is false.

Deprecated options

partialRefetch

boolean

Deprecated. If true, causes a query refetch if the query result is detected as partial. Setting this option is unnecessary in Apollo Client 3, thanks to a more consistent application of fetch policies. It might be removed in a future release.

The default value is false.

Result

PropertyTypeDescription
dataTDataAn object containing the result of your GraphQL query. Defaults to undefined.
previousDataTDataAn object containing the previous result of your GraphQL query (the last result before a new data value was set). Defaults to undefined.
loadingbooleanA boolean that indicates whether the request is in flight
errorApolloErrorA runtime error with graphQLErrors and networkError properties
variables{ [key: string]: any }An object containing the variables the query was called with
networkStatusNetworkStatusA number from 1-8 (1 = loading, 2 = setVariables, 3 = fetchMore, 4 = refetch, 6 = poll, 7 = ready, 8 = error) corresponding to the detailed state of your network request. Includes information about refetching and polling status. Used in conjunction with the notifyOnNetworkStatusChange prop.
refetch(variables?: Partial<TVariables>) => Promise<ApolloQueryResult>A function that allows you to refetch the query and optionally pass in new variables
fetchMore({ query?: DocumentNode, variables?: TVariables, updateQuery: Function}) => Promise<ApolloQueryResult>A function that enables pagination for your query
startPolling(interval: number) => voidThis function sets up an interval in ms and fetches the query each time the specified interval passes.
stopPolling() => voidThis function stops the query from polling.
subscribeToMore(options: { document: DocumentNode, variables?: TVariables, updateQuery?: Function, onError?: Function}) => () => voidA function that sets up a subscription. subscribeToMore returns a function that you can use to unsubscribe.
updateQuery(previousResult: TData, options: { variables: TVariables }) => TDataA function that allows you to update the query's result in the cache outside the context of a fetch, mutation, or subscription
clientApolloClientYour ApolloClient instance. Useful for manually firing queries or writing data to the cache.
calledbooleanA boolean indicating if the query function has been called, used by useLazyQuery (not set for useQuery / Query).

useLazyQuery

Example

import { gql, useLazyQuery } from "@apollo/client";

const GET_GREETING = gql`
  query GetGreeting($language: String!) {
    greeting(language: $language) {
      message
    }
  }
`;

function Hello() {
  const [loadGreeting, { called, loading, data }] = useLazyQuery(
    GET_GREETING,
    { variables: { language: "english" } }
  );
  if (called && loading) return <p>Loading ...</p>
  if (!called) {
    return <button onClick={() => loadGreeting()}>Load greeting</button>
  }
  return <h1>Hello {data.greeting.message}!</h1>;
}

Refer to the Queries section for a more in-depth overview of useLazyQuery.

Function Signature

function useLazyQuery<TData = any, TVariables = OperationVariables>(
  query: DocumentNode,
  options?: LazyQueryHookOptions<TData, TVariables>,
): [
  (options?: QueryLazyOptions<TVariables>) => void,
  QueryResult<TData, TVariables>
] {}

Params

query

ParamTypeDescription
queryDocumentNodeA GraphQL query document parsed into an AST by gql.

options

Name /
Type
Description

Operation options

query

DocumentNode

A GraphQL query string parsed into an AST with the gql template literal.

Optional for the useQuery hook, because the query can be provided as the first parameter to the hook. Required for the Query component.

variables

{ [key: string]: any }

An object containing all of the GraphQL variables your query requires to execute.

Each key in the object corresponds to a variable name, and that key's value corresponds to the variable value.

errorPolicy

ErrorPolicy

Specifies how the query handles a response that returns both GraphQL errors and partial results.

For details, see GraphQL error policies.

The default value is none, meaning that the query result includes error details but not partial results.

onCompleted

(data: TData | {}) => void

A callback function that's called when your query successfully completes with zero errors (or if errorPolicy is ignore and partial data is returned).

This function is passed the query's result data.

onError

(error: ApolloError) => void

A callback function that's called when the query encounters one or more errors (unless errorPolicy is ignore).

This function is passed an ApolloError object that contains either a networkError object or a graphQLErrors array, depending on the error(s) that occurred.

skip

boolean

If true, the query is not executed. Not available with useLazyQuery.

This property is part of Apollo Client's React integration, and it is not available in the core ApolloClient API.

The default value is false.

displayName

string

The name of your component to be displayed in the React Developer Tools.

The default value is Query.

Networking options

pollInterval

number

Specifies the interval (in milliseconds) at which the query polls for updated results.

The default value is 0 (no polling).

notifyOnNetworkStatusChange

boolean

If true, the in-progress query's associated component re-renders whenever the network status changes or a network error occurs.

The default value is false.

context

Record<string, any>

If you're using Apollo Link, this object is the initial value of the context object that's passed along your link chain.

ssr

boolean

Pass false to skip executing the query during server-side rendering.

client

ApolloClient

The instance of ApolloClient to use to execute the query.

By default, the instance that's passed down via context is used, but you can provide a different instance here.

Caching options

fetchPolicy

FetchPolicy

Specifies how the query interacts with the Apollo Client cache during execution (for example, whether it checks the cache for results before sending a request to the server).

For details, see Setting a fetch policy.

The default value is cache-first.

nextFetchPolicy

FetchPolicy

Specifies the fetchPolicy to use for all executions of this query after this execution.

For example, you can use this to switch back to a cache-first fetch policy after using cache-and-network or network-only for a single execution.

returnPartialData

boolean

If true, the query can return partial results from the cache if the cache doesn't contain results for all queried fields.

The default value is false.

Deprecated options

partialRefetch

boolean

Deprecated. If true, causes a query refetch if the query result is detected as partial. Setting this option is unnecessary in Apollo Client 3, thanks to a more consistent application of fetch policies. It might be removed in a future release.

The default value is false.

Result

Execute function

ParamTypeDescription
Execute function(options?: QueryLazyOptions<TVariables>) => voidFunction that can be triggered to execute the suspended query. After being called, useLazyQuery behaves just like useQuery.

Result object

PropertyTypeDescription
dataTDataAn object containing the result of your GraphQL query. Defaults to undefined.
previousDataTDataAn object containing the previous result of your GraphQL query (the last result before a new data value was set). Defaults to undefined.
loadingbooleanA boolean that indicates whether the request is in flight
errorApolloErrorA runtime error with graphQLErrors and networkError properties
variables{ [key: string]: any }An object containing the variables the query was called with
networkStatusNetworkStatusA number from 1-8 (1 = loading, 2 = setVariables, 3 = fetchMore, 4 = refetch, 6 = poll, 7 = ready, 8 = error) corresponding to the detailed state of your network request. Includes information about refetching and polling status. Used in conjunction with the notifyOnNetworkStatusChange prop.
refetch(variables?: Partial<TVariables>) => Promise<ApolloQueryResult>A function that allows you to refetch the query and optionally pass in new variables
fetchMore({ query?: DocumentNode, variables?: TVariables, updateQuery: Function}) => Promise<ApolloQueryResult>A function that enables pagination for your query
startPolling(interval: number) => voidThis function sets up an interval in ms and fetches the query each time the specified interval passes.
stopPolling() => voidThis function stops the query from polling.
subscribeToMore(options: { document: DocumentNode, variables?: TVariables, updateQuery?: Function, onError?: Function}) => () => voidA function that sets up a subscription. subscribeToMore returns a function that you can use to unsubscribe.
updateQuery(previousResult: TData, options: { variables: TVariables }) => TDataA function that allows you to update the query's result in the cache outside the context of a fetch, mutation, or subscription
clientApolloClientYour ApolloClient instance. Useful for manually firing queries or writing data to the cache.
calledbooleanA boolean indicating if the query function has been called, used by useLazyQuery (not set for useQuery / Query).

useMutation

Example

import { gql, useMutation } from '@apollo/client';

const ADD_TODO = gql`
  mutation AddTodo($type: String!) {
    addTodo(type: $type) {
      id
      type
    }
  }
`;

function AddTodo() {
  let input;
  const [addTodo, { data }] = useMutation(ADD_TODO);

  return (
    <div>
      <form
        onSubmit={e => {
          e.preventDefault();
          addTodo({ variables: { type: input.value } });
          input.value = '';
        }}
      >
        <input
          ref={node => {
            input = node;
          }}
        />
        <button type="submit">Add Todo</button>
      </form>
    </div>
  );
}

Refer to the Mutations section for a more in-depth overview of useMutation.

Function Signature

function useMutation<TData = any, TVariables = OperationVariables>(
  mutation: DocumentNode,
  options?: MutationHookOptions<TData, TVariables>,
): MutationTuple<TData, TVariables> {}

Params

mutation

ParamTypeDescription
mutationDocumentNodeA GraphQL mutation document parsed into an AST by gql.

options

OptionTypeDescription
mutationDocumentNodeA GraphQL mutation document parsed into an AST by graphql-tag. Optional for the useMutation Hook since the mutation can be passed in as the first parameter to the Hook. Required for the Mutation component.
variables{ [key: string]: any }An object containing all of the variables your mutation needs to execute
update(cache: DataProxy, mutationResult: FetchResult)A function used to update the cache after a mutation occurs
ignoreResultsbooleanIf true, the returned data property will not update with the mutation result.
optimisticResponseObjectProvide a mutation response before the result comes back from the server
refetchQueriesArray<string|{ query: DocumentNode, variables?: TVariables}> | ((mutationResult: FetchResult) => Array<string|{ query: DocumentNode, variables?: TVariables}>)An array or function that allows you to specify which queries you want to refetch after a mutation has occurred. Array values can either be queries (with optional variables) or just the string names of queries to be refeteched.
awaitRefetchQueriesbooleanQueries refetched as part of refetchQueries are handled asynchronously, and are not waited on before the mutation is completed (resolved). Setting this to true will make sure refetched queries are completed before the mutation is considered done. false by default.
onCompleted(data: TData) => voidA callback executed once your mutation successfully completes
onError(error: ApolloError) => voidA callback executed in the event of an error.
contextRecord<string, any>Shared context between your component and your network interface (Apollo Link). Useful for setting headers from props or sending information to the request function of Apollo Boost.
clientApolloClientAn ApolloClient instance. By default useMutation / Mutation uses the client passed down via context, but a different client can be passed in.

Result

Mutate function:

PropertyTypeDescription
mutate(options?: MutationOptions) => Promise<FetchResult>A function to trigger a mutation from your UI. You can optionally pass variables, optimisticResponse, refetchQueries, and update in as options, which will override options/props passed to useMutation / Mutation. The function returns a promise that fulfills with your mutation result.

Mutation result:

PropertyTypeDescription
dataTDataThe data returned from your mutation. It can be undefined if ignoreResults is true.
loadingbooleanA boolean indicating whether your mutation is in flight
errorApolloErrorAny errors returned from the mutation
calledbooleanA boolean indicating if the mutate function has been called
clientApolloClientYour ApolloClient instance. Useful for invoking cache methods outside the context of the update function, such as client.writeData and client.readQuery.

useSubscription

Example

const COMMENTS_SUBSCRIPTION = gql`
  subscription OnCommentAdded($repoFullName: String!) {
    commentAdded(repoFullName: $repoFullName) {
      id
      content
    }
  }
`;

function DontReadTheComments({ repoFullName }) {
  const {
    data: { commentAdded },
    loading,
  } = useSubscription(COMMENTS_SUBSCRIPTION, { variables: { repoFullName } });
  return <h4>New comment: {!loading && commentAdded.content}</h4>;
}

Refer to the Subscriptions section for a more in-depth overview of useSubscription.

Function Signature

function useSubscription<TData = any, TVariables = OperationVariables>(
  subscription: DocumentNode,
  options?: SubscriptionHookOptions<TData, TVariables>,
): {
  variables: TVariables;
  loading: boolean;
  data?: TData;
  error?: ApolloError;
} {}

Params

subscription

ParamTypeDescription
subscriptionDocumentNodeA GraphQL subscription document parsed into an AST by gql.

options

OptionTypeDescription
subscriptionDocumentNodeA GraphQL subscription document parsed into an AST by graphql-tag. Optional for the useSubscription Hook since the subscription can be passed in as the first parameter to the Hook. Required for the Subscription component.
variables{ [key: string]: any }An object containing all of the variables your subscription needs to execute
shouldResubscribebooleanDetermines if your subscription should be unsubscribed and subscribed again
skipbooleanIf skip is true, the subscription will be skipped entirely
onSubscriptionData(options: OnSubscriptionDataOptions<TData>) => anyAllows the registration of a callback function, that will be triggered each time the useSubscription Hook / Subscription component receives data. The callback options object param consists of the current Apollo Client instance in client, and the received subscription data in subscriptionData.
fetchPolicyFetchPolicyHow you want your component to interact with the Apollo cache. Defaults to "cache-first".
clientApolloClientAn ApolloClient instance. By default useSubscription / Subscription uses the client passed down via context, but a different client can be passed in.

Result

PropertyTypeDescription
dataTDataAn object containing the result of your GraphQL subscription. Defaults to an empty object.
loadingbooleanA boolean that indicates whether any initial data has been returned
errorApolloErrorA runtime error with graphQLErrors and networkError properties

useApolloClient

Example

import { useApolloClient } from '@apollo/client';

function SomeComponent() {
  const client = useApolloClient();
  // `client` is now set to the `ApolloClient` instance being used by the
  // application (that was configured using something like `ApolloProvider`)
}

Function Signature

function useApolloClient(): ApolloClient<object> {}

Result

ParamTypeDescription
Apollo Client instanceApolloClient<object>The ApolloClient instance being used by the application.
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