Querying from an Application
Once a subgraph is deployed to the Subgraph Studio or to The Graph Explorer, you will be given the endpoint for your GraphQL API that should look something like this:
Subgraph Studio (testing endpoint)
Queries (HTTP)https://api.studio.thegraph.com/query/<ID>/<SUBGRAPH_NAME>/<VERSION>
Graph Explorer
Queries (HTTP)https://gateway.thegraph.com/api/<API_KEY>/subgraphs/id/<SUBGRAPH_ID>
Using the GraphQL endpoint, you can use various GraphQL Client libraries to query the subgraph and populate your app with the data indexed by the subgraph.
Here are a couple of the more popular GraphQL clients in the ecosystem and how to use them:

Apollo client supports web projects, including frameworks like React and Vue, as well as mobile clients like iOS, Android, and React Native.
Let's look at how to fetch data from a subgraph with Apollo client in a web project.
First, install @apollo/client and graphql:
npm install @apollo/client graphql
Then you can query the API with the following code:
import { ApolloClient, InMemoryCache, gql } from '@apollo/client'
const APIURL = 'https://api.studio.thegraph.com/query//<SUBGRAPH_NAME>/'
const tokensQuery = ` query { tokens { id tokenID contentURI metadataURI } }`
const client = new ApolloClient({ uri: APIURL, cache: new InMemoryCache(),})
client .query({ query: gql(tokensQuery), }) .then((data) => console.log('Subgraph data: ', data)) .catch((err) => { console.log('Error fetching data: ', err) })
To use variables, you can pass in a variables argument to the query:
const tokensQuery = ` query($first: Int, $orderBy: BigInt, $orderDirection: String) { tokens( first: $first, orderBy: $orderBy, orderDirection: $orderDirection ) { id tokenID contentURI metadataURI } }`
client .query({ query: gql(tokensQuery), variables: { first: 10, orderBy: 'createdAtTimestamp', orderDirection: 'desc', }, }) .then((data) => console.log('Subgraph data: ', data)) .catch((err) => { console.log('Error fetching data: ', err) })

Another option is URQL, a somewhat lighter-weight GraphQL client library.
Let's look at how to fetch data from a subgraph with URQL in a web project.
First, install urql and graphql:
npm install urql graphql
Then you can query the API with the following code:
import { createClient } from 'urql'
const APIURL = 'https://api.thegraph.com/subgraphs/name/username/subgraphname'
const tokensQuery = ` query { tokens { id tokenID contentURI metadataURI } }`
const client = createClient({ url: APIURL,})
const data = await client.query(tokensQuery).toPromise()
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