> ## Documentation Index
> Fetch the complete documentation index at: https://trigger-triggering-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Trigger hooks

> Triggering tasks from your frontend application.

We provide a set of hooks that can be used to trigger tasks from your frontend application.

## Demo

We've created a [Demo application](https://github.com/triggerdotdev/realtime-llm-battle) that demonstrates how to use our React hooks to trigger tasks in a Next.js application. The application uses the `@trigger.dev/react-hooks` package to trigger a task and subscribe to the run in real-time.

## Installation

Install the `@trigger.dev/react-hooks` package in your project:

<CodeGroup>
  ```bash npm theme={null}
  npm add @trigger.dev/react-hooks
  ```

  ```bash pnpm theme={null}
  pnpm add @trigger.dev/react-hooks
  ```

  ```bash yarn theme={null}
  yarn install @trigger.dev/react-hooks
  ```
</CodeGroup>

## Authentication

To authenticate a trigger hook, you must provide a special one-time use "trigger" token. These tokens are very similar to [Public Access Tokens](/frontend/overview#authentication), but they can only be used once to trigger a task. You can generate a trigger token using the `auth.createTriggerPublicToken` function in your backend code:

```ts theme={null}
import { auth } from "@trigger.dev/sdk/v3";
// Somewhere in your backend code
const triggerToken = await auth.createTriggerPublicToken("my-task");
```

These tokens also expire, with the default expiration time being 15 minutes. You can specify a custom expiration time by passing a `expirationTime` parameter:

```ts theme={null}
import { auth } from "@trigger.dev/sdk/v3";
// Somewhere in your backend code
const triggerToken = await auth.createTriggerPublicToken("my-task", {
  expirationTime: "24hr",
});
```

You can also pass multiple tasks to the `createTriggerPublicToken` function to create a token that can trigger multiple tasks:

```ts theme={null}
import { auth } from "@trigger.dev/sdk/v3";
// Somewhere in your backend code
const triggerToken = await auth.createTriggerPublicToken(["my-task-1", "my-task-2"]);
```

You can also pass the `multipleUse` parameter to create a token that can be used multiple times:

```ts theme={null}
import { auth } from "@trigger.dev/sdk/v3";

// Somewhere in your backend code
const triggerToken = await auth.createTriggerPublicToken("my-task", {
  multipleUse: true, // ❌ Use this with caution!
});
```

<Note>
  After generating the trigger token in your backend, you must pass it to your frontend application.
  We have a guide on how to do this in the [React hooks
  overview](/frontend/react-hooks/overview#passing-the-token-to-the-frontend).
</Note>

## Hooks

### useTaskTrigger

The `useTaskTrigger` hook allows you to trigger a task from your frontend application.

```tsx theme={null}
"use client"; // This is needed for Next.js App Router or other RSC frameworks

import { useTaskTrigger } from "@trigger.dev/react-hooks";
import type { myTask } from "@/trigger/myTask";
//     👆 This is the type of your task

export function MyComponent({ publicAccessToken }: { publicAccessToken: string }) {
  //                         pass the type of your task here 👇
  const { submit, handle, error, isLoading } = useTaskTrigger<typeof myTask>("my-task", {
    accessToken: publicAccessToken, // 👈 this is the "trigger" token
  });

  if (error) {
    return <div>Error: {error.message}</div>;
  }

  if (handle) {
    return <div>Run ID: {handle.id}</div>;
  }

  return (
    <button onClick={() => submit({ foo: "bar" })} disabled={isLoading}>
      {isLoading ? "Loading..." : "Trigger Task"}
    </button>
  );
}
```

`useTaskTrigger` returns an object with the following properties:

* `submit`: A function that triggers the task. It takes the payload of the task as an argument.
* `handle`: The run handle object. This object contains the ID of the run that was triggered, along with a Public Access Token that can be used to access the run.
* `isLoading`: A boolean that indicates whether the task is currently being triggered.
* `error`: An error object that contains any errors that occurred while triggering the task.

The `submit` function triggers the task with the specified payload. You can additionally pass an optional [options](/triggering#options) argument to the `submit` function:

```tsx theme={null}
submit({ foo: "bar" }, { tags: ["tag1", "tag2"] });
```

#### Using the handle object

You can use the `handle` object to initiate a subsequent [realtime hook](/frontend/react-hooks/realtime#userealtimerun) to subscribe to the run.

```tsx theme={null}
"use client"; // This is needed for Next.js App Router or other RSC frameworks

import { useTaskTrigger, useRealtimeRun } from "@trigger.dev/react-hooks";
import type { myTask } from "@/trigger/myTask";
//     👆 This is the type of your task

export function MyComponent({ publicAccessToken }: { publicAccessToken: string }) {
  //                         pass the type of your task here 👇
  const { submit, handle, error, isLoading } = useTaskTrigger<typeof myTask>("my-task", {
    accessToken: publicAccessToken, // 👈 this is the "trigger" token
  });

  //     use the handle object to preserve type-safety 👇
  const { run, error: realtimeError } = useRealtimeRun(handle, {
    accessToken: handle?.publicAccessToken,
    enabled: !!handle, // Only subscribe to the run if the handle is available
  });

  if (error) {
    return <div>Error: {error.message}</div>;
  }

  if (handle) {
    return <div>Run ID: {handle.id}</div>;
  }

  if (realtimeError) {
    return <div>Error: {realtimeError.message}</div>;
  }

  if (run) {
    return <div>Run ID: {run.id}</div>;
  }

  return (
    <button onClick={() => submit({ foo: "bar" })} disabled={isLoading}>
      {isLoading ? "Loading..." : "Trigger Task"}
    </button>
  );
}
```

We've also created some additional hooks that allow you to trigger tasks and subscribe to the run in one step:

### useRealtimeTaskTrigger

The `useRealtimeTaskTrigger` hook allows you to trigger a task from your frontend application and then subscribe to the run in using Realtime:

```tsx theme={null}
"use client"; // This is needed for Next.js App Router or other RSC frameworks

import { useRealtimeTaskTrigger } from "@trigger.dev/react-hooks";
import type { myTask } from "@/trigger/myTask";

export function MyComponent({ publicAccessToken }: { publicAccessToken: string }) {
  const { submit, run, error, isLoading } = useRealtimeTaskTrigger<typeof myTask>("my-task", {
    accessToken: publicAccessToken,
  });

  if (error) {
    return <div>Error: {error.message}</div>;
  }

  // This is the realtime run object, which will automatically update when the run changes
  if (run) {
    return <div>Run ID: {run.id}</div>;
  }

  return (
    <button onClick={() => submit({ foo: "bar" })} disabled={isLoading}>
      {isLoading ? "Loading..." : "Trigger Task"}
    </button>
  );
}
```

### useRealtimeTaskTriggerWithStreams

The `useRealtimeTaskTriggerWithStreams` hook allows you to trigger a task from your frontend application and then subscribe to the run in using Realtime, and also receive any streams that are emitted by the task.

```tsx theme={null}
"use client"; // This is needed for Next.js App Router or other RSC frameworks

import { useRealtimeTaskTriggerWithStreams } from "@trigger.dev/react-hooks";
import type { myTask } from "@/trigger/myTask";

type STREAMS = {
  openai: string; // this is the type of each "part" of the stream
};

export function MyComponent({ publicAccessToken }: { publicAccessToken: string }) {
  const { submit, run, streams, error, isLoading } = useRealtimeTaskTriggerWithStreams<
    typeof myTask,
    STREAMS
  >("my-task", {
    accessToken: publicAccessToken,
  });

  if (error) {
    return <div>Error: {error.message}</div>;
  }

  if (streams && run) {
    const text = streams.openai?.map((part) => part).join("");

    return (
      <div>
        <div>Run ID: {run.id}</div>
        <div>{text}</div>
      </div>
    );
  }

  return (
    <button onClick={() => submit({ foo: "bar" })} disabled={isLoading}>
      {isLoading ? "Loading..." : "Trigger Task"}
    </button>
  );
}
```