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 # Subscriptions
+
+In addition to fetching data using queries and modifying data using mutations, the GraphQL spec supports a third operation type, called `subscription`.
+
+GraphQL subscriptions are a way to push data from the server to the clients that choose to listen to real time messages from the server. Subscriptions are similar to queries in that they specify a set of fields to be delivered to the client, but instead of immediately returning a single answer, a result is sent every time a particular event happens on the server.
+
+A common use case for subscriptions is notifying the client side about particular events, for example the creation of a new object, updated fields and so on.
+
+## Overview
+
+GraphQL subscriptions have to be defined in the schema, just like queries and mutations:
+
+```graphql
+type Subscription {
+  messageAdded (channelId: ID!): Message!
+}
+```
+
+On the client, subscription queries look just like any other kind of operation:
+
+```graphql
+subscription onMessageAdded ($channelId: ID!){
+  messageAdded(channelId: $channelId){
+    id
+    text
+  }
+}
+```
+
+The response sent to the client looks as follows:
+
+```json
+{
+  "data": {
+    "messageAdded": {
+      "id": "123",
+      "text": "Hello!"
+    }
+  }
+}
+```
+
+In the above example, the server is written to send a new result every time a message is added for a specific channel. Note that the code above only defines the GraphQL subscription in the schema. Read [setting up subscriptions on the client](#client-setup) and [setting up GraphQL subscriptions for the server](https://www.apollographql.com/docs/graphql-subscriptions) to learn how to add subscriptions to your app.
+
+### When to use subscriptions
+
+In most cases, intermittent polling or manual refetching are actually the best way to keep your client up to date. So when is a subscription the best option? Subscriptions are especially useful if:
+
+1. The initial state is large, but the incremental change sets are small. The starting state can be fetched with a query and subsequently updated through a subscription.
+2. You care about low-latency updates in the case of specific events, for example in the case of a chat application where users expect to receive new messages in a matter of seconds.
+
+A future version of Apollo or GraphQL might include support for live queries, which would be a low-latency way to replace polling, but at this point general live queries in GraphQL are not yet possible outside of some relatively experimental setups.
+
+## Client setup
+
+The most popular transport for GraphQL subscriptions today is [`subscriptions-transport-ws`](https://github.com/apollographql/subscriptions-transport-ws). This package is maintained by the Apollo community, but can be used with any client or server GraphQL implementation. In this article, we'll explain how to set it up on the client, but you'll also need a server implementation. You can [read about how to use subscriptions with a JavaScript server](https://www.apollographql.com/docs/graphql-subscriptions/setup), or enjoy subscriptions set up out of the box if you are using a GraphQL backend as a service like [Graphcool](https://www.graph.cool/docs/tutorials/worldchat-subscriptions-example-ui0eizishe/).
+
+Let's look at how to add support for this transport to Apollo Client.
+
+First, install the WebSocket Apollo Link (`apollo-link-ws`) from npm:
+
+```shell
+npm install --save apollo-link-ws subscriptions-transport-ws
+```
+
+Or:
+
+```shell
+yarn add apollo-link-ws subscriptions-transport-ws
+```
+
+Then, initialize a GraphQL subscriptions transport link:
+
+```js
+import { WebSocketLink } from 'apollo-link-ws'
+
+const wsLink = new WebSocketLink({
+  uri: `ws://localhost:5000/`,
+  options: {
+    reconnect: true,
+  },
+})
+```
+
+We need to either use the `WebSocketLink` or the `HttpLink` depending on the operation type:
+
+```js
+import { split } from 'apollo-link'
+import { HttpLink } from 'apollo-link-http'
+import { WebSocketLink } from 'apollo-link-ws'
+import { getMainDefinition } from 'apollo-utilities'
+
+// Create an http link:
+const httpLink = new HttpLink({
+  uri: 'http://localhost:3000/graphql',
+})
+
+// Create a WebSocket link:
+const wsLink = new WebSocketLink({
+  uri: `ws://localhost:5000/`,
+  options: {
+    reconnect: true,
+  },
+})
+
+// using the ability to split links, you can send data to each link
+// depending on what kind of operation is being sent
+const link = split(
+  // split based on operation type
+  ({ query }) => {
+    const definition = getMainDefinition(query)
+    return (
+      definition.kind === 'OperationDefinition' &&
+      definition.operation === 'subscription'
+    )
+  },
+  wsLink,
+  httpLink,
+)
+```
+
+Now, queries and mutations will go over HTTP as normal, but subscriptions will be done over the websocket transport.
+
+## useSubscription
+
+The easiest way to add live data to your UI is using the `useSubscription` composition function. This lets you continuously receive updates from your server to update a `Ref` or a reactive object, thus re-rendering your component. One thing to note, subscriptions are just listeners, they don't request any data when first connected : they only open up a connection to get new data.
+
+Start by importing `useSubscription` in your component:
+
+```vue{2}
+<script>
+import { useSubscription } from '@vue/apollo-composable'
+
+export default {
+  setup () {
+    // Data & Logic here...
+  },
+}
+</script>
+```
+
+We can then pass a GraphQL document as the first parameter and retrieve the `result` ref:
+
+```vue{6-13}
+<script>
+import { useSubscription } from '@vue/apollo-composable'
+
+export default {
+  setup () {
+    const { result } = useSubscription(gql`
+      subscription onMessageAdded {
+        messageAdded {
+          id
+          text
+        }
+      }
+    `)
+  },
+}
+</script>
+```
+
+We can then `watch` the result as new data is received:
+
+```vue{2,16-20}
+<script>
+import { watch } from '@vue/composition-api'
+import { useSubscription } from '@vue/apollo-composable'
+
+export default {
+  setup () {
+    const { result } = useSubscription(gql`
+      subscription onMessageAdded {
+        messageAdded {
+          id
+          text
+        }
+      }
+    `)
+
+    watch(result, data => {
+      console.log('New message received:', data.messageAdded)
+    }, {
+      lazy: true, // Don't immediately execute handler
+    })
+  },
+}
+</script>
+```
+
+For example, we could display the list of messages as we receive them:
+
+```vue{2,7,19,24-26,31-39}
+<script>
+import { watch, ref } from '@vue/composition-api'
+import { useSubscription } from '@vue/apollo-composable'
+
+export default {
+  setup () {
+    const messages = ref([])
+
+    const { result } = useSubscription(gql`
+      subscription onMessageAdded {
+        messageAdded {
+          id
+          text
+        }
+      }
+    `)
+
+    watch(result, data => {
+      messages.value.push(data.messageAdded)
+    }, {
+      lazy: true, // Don't immediately execute handler
+    })
+
+    return {
+      messages,
+    }
+  },
+}
+</script>
+
+<template>
+  <div>
+    <ul>
+      <li v-for="message of messages" :key="message.id">
+        {{ message.text }}
+      </li>
+    </ul>
+  </div>
+</template>
+```
+
+### Variables
+
+We can pass variables in the 2nd parameter. Just like `useQuery`, it can either be an object, a `Ref`, a reactive object or a function that will be made reactive.
+
+With a ref:
+
+```js
+const variables = ref({
+  channelId: 'abc',
+})
+
+const { result } = useSubscription(gql`
+  subscription onMessageAdded ($channelId: ID!) {
+    messageAdded (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`, variables)
+```
+
+With a reactive object:
+
+```js
+const variables = reactive({
+  channelId: 'abc',
+})
+
+const { result } = useSubscription(gql`
+  subscription onMessageAdded ($channelId: ID!) {
+    messageAdded (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`, variables)
+```
+
+With a function (which will automatically be made reactive):
+
+```js
+const channelId = ref('abc')
+
+const { result } = useSubscription(gql`
+  subscription onMessageAdded ($channelId: ID!) {
+    messageAdded (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`, () => ({
+  channelId: channelId.value,
+}))
+```
+
+### Options
+
+Similar to the variables, you can pass options to the third parameter of `useSubscription`:
+
+```js
+const { result } = useSubscription(gql`
+  subscription onMessageAdded ($channelId: ID!) {
+    messageAdded (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`, null, {
+  fetchPolicy: 'no-cache',
+})
+```
+
+It can also be a reactive object, or a function that will automatically be made reactive:
+
+```js
+const { result } = useSubscription(gql`
+  subscription onMessageAdded ($channelId: ID!) {
+    messageAdded (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`, null, () => ({
+  fetchPolicy: 'no-cache',
+}))
+```
+
+See the [API Reference](../api/use-subscription) for all the possible options.
+
+### Disable a subscription
+
+You can disable and re-enable a subscription with the `enabled` option:
+
+```js
+const enabled = ref(false)
+
+const { result } = useSubscription(gql`
+  ...
+`, null, () => ({
+  enabled: enabled.value,
+}))
+
+function enableSub () {
+  enabled.value = true
+}
+```
+
+### Subscription status
+
+You can retrieve the loading and error stats from `useSubscription`:
+
+```js
+const { loading, error } = useSubscription(...)
+```
+
+### Event hooks
+
+#### onResult
+
+This is called when a new result is received from the server:
+
+```js
+const { onResult } = useSubscription(...)
+
+onResult(result => {
+  console.log(result.data)
+})
+```
+
+#### onError
+
+This is triggered when an error occurs:
+
+```js
+import { logErrorMessages } from '@vue/apollo-util'
+
+const { onError } = useSubscription(...)
+
+onError(error => {
+  logErrorMessages(error)
+})
+```
+
+## subscribeToMore
+
+With GraphQL subscriptions your client will be alerted on push from the server and you should choose the pattern that fits your application the most:
+
+- Use it as a notification and run any logic you want when it fires, for example alerting the user or refetching data
+- Use the data sent along with the notification and merge it directly into the store (existing queries are automatically notified)
+
+With `subscribeToMore`, you can easily do the latter.
+
+`subscribeToMore` is a function available on every query created with `useQuery`. It works just like [`fetchMore`](./cache-interaction/#incremental-loading-fetchmore), except that the update function gets called every time the subscription returns, instead of only once.
+
+Let's take the query from our previous example component from the section on [mutations](./mutation) (modified a little bit to have a variable):
+
+```vue
+<script>
+const MESSAGES = gql`
+  query getMessages ($channelId: ID!) {
+    messages (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`
+
+export default {
+  props: ['channelId'],
+
+  setup (props) {
+    // Messages list
+    const { result } = useQuery(MESSAGES, () => ({
+      channelId: props.channelId
+    }))
+    const messages = useResult(result, [])
+
+    return {
+      messages,
+    }
+  },
+}
+</script>
+```
+
+Now let's add the subscription to this query.
+
+Retrieve the `subscribeToMore` function from `useQuery`:
+
+```vue{16,21}
+<script>
+const MESSAGES = gql`
+  query getMessages ($channelId: ID!) {
+    messages (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`
+
+export default {
+  props: ['channelId'],
+
+  setup (props) {
+    // Messages list
+    const { result, subscribeToMore } = useQuery(MESSAGES, () => ({
+      channelId: props.channelId
+    }))
+    const messages = useResult(result, [])
+
+    subscribeToMore()
+
+    return {
+      messages,
+    }
+  },
+}
+</script>
+```
+
+It expects either an object or a function that will automatically be reactive:
+
+```
+subscribeToMore({
+  // options...
+})
+```
+
+```
+subscribeToMore(() => ({
+  // options...
+}))
+```
+
+In the latter case, the subscription will automatically restart if the options change.
+
+You can now put a GraphQL document with the relevant subscription, with variables if necessary:
+
+```vue{21-33}
+<script>
+const MESSAGES = gql`
+  query getMessages ($channelId: ID!) {
+    messages (channelId: $channelId) {
+      id
+      text
+    }
+  }
+`
+
+export default {
+  props: ['channelId'],
+
+  setup (props) {
+    // Messages list
+    const { result, subscribeToMore } = useQuery(MESSAGES, () => ({
+      channelId: props.channelId
+    }))
+    const messages = useResult(result, [])
+
+    subscribeToMore(() => ({
+      document: gql`
+        subscription onMessageAdded ($channelId: ID!) {
+          messageAdded (channelId: $channelId) {
+            id
+            text
+          }
+        }
+      `,
+      variables: {
+        channelId: props.channelId,
+      },
+    }))
+
+    return {
+      messages,
+    }
+  },
+}
+</script>
+```
+
+Now that the subscription is added to the query, we need to tell Apollo Client how to update the query result with the `updateQuery` option:
+
+```js{13-16}
+subscribeToMore(() => ({
+  document: gql`
+    subscription onMessageAdded ($channelId: ID!) {
+      messageAdded (channelId: $channelId) {
+        id
+        text
+      }
+    }
+  `,
+  variables: {
+    channelId: props.channelId,
+  },
+  updateQuery: (previousResult, { subscriptionData }) => {
+    previousResult.messages.push(subscriptionData.messageAdded)
+    return previousResult
+  },
+}))
+```
+
+## Authentication over WebSocket
+
+In many cases it is necessary to authenticate clients before allowing them to receive subscription results. To do this, the `SubscriptionClient` constructor accepts a `connectionParams` field, which passes a custom object that the server can use to validate the connection before setting up any subscriptions.
+
+```js
+import { WebSocketLink } from 'apollo-link-ws';
+
+const wsLink = new WebSocketLink({
+  uri: `ws://localhost:5000/`,
+  options: {
+    reconnect: true,
+    connectionParams: {
+        authToken: user.authToken,
+    },
+});
+```
+
+::: tip
+You can use `connectionParams` for anything else you might need, not only authentication, and check its payload on the server side with [SubscriptionsServer](https://www.apollographql.com/docs/graphql-subscriptions/authentication).
+:::