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# Courier JS

`@trycourier/courier-js` is the API client for Courier's browser SDKs. It provides programmatic access to inbox messages, user preferences, brands, and list subscriptions for web browser-based applications.

> **Looking for UI components?** Check out [Courier React](https://github.com/trycourier/courier-web/tree/main/%40trycourier/courier-react) for React components, or [Courier UI Inbox](https://github.com/trycourier/courier-web/tree/main/%40trycourier/courier-ui-inbox) and [Courier UI Toast](https://github.com/trycourier/courier-web/tree/main/%40trycourier/courier-ui-toast) for framework-agnostic Web Components.

## Installation

```bash
npm install @trycourier/courier-js
```

## Quick Start

```ts
import { CourierClient } from "@trycourier/courier-js";

const courierClient = new CourierClient({
  userId: "my-user-id",
  jwt: "eyJ.mock.jwt",
});

// Fetch inbox messages
const inboxMessages = await courierClient.inbox.getMessages();

// Mark a message as read
const { messageId } = inboxMessages.data.messages.nodes[0];
await courierClient.inbox.read({ messageId });
```

## EU Endpoints

Use the built-in preset helper when your app should talk to Courier's EU endpoints:

```ts
import { CourierClient, getCourierApiUrlsForRegion } from "@trycourier/courier-js";

const courierClient = new CourierClient({
  userId: "my-user-id",
  jwt: "eyJ.mock.jwt",
  apiUrls: getCourierApiUrlsForRegion("eu"),
});
```

### `CourierClient` Options

| Option   | Type    | Required | Description |
|----------|---------|----------|-------------|
| userId   | string  | Yes      | The user ID to authenticate and fetch messages for. |
| jwt      | string  | Yes      | The JWT access token minted for the user. |
| tenantId | string  | No       | Scope messages to a specific tenant. |
| showLogs | boolean | No       | Enable debugging console logs. Defaults to `true` in development. |

## Authentication

The SDK requires a JWT (JSON Web Token) for authentication. **Always generate JWTs on your backend server, never in client-side code.**

1. Your client calls your backend to request a token.
2. Your backend calls the [Courier Issue Token endpoint](https://www.courier.com/docs/api-reference/authentication/create-a-jwt) using your API key.
3. Your backend returns the JWT to your client and passes it to the SDK.

```bash
curl --request POST \
     --url https://api.courier.com/auth/issue-token \
     --header 'Authorization: Bearer $YOUR_API_KEY' \
     --header 'Content-Type: application/json' \
     --data '{
       "scope": "user_id:$YOUR_USER_ID inbox:read:messages inbox:write:events read:preferences write:preferences read:brands",
       "expires_in": "1 day"
     }'
```

## API Overview

**Inbox** — read and manage inbox messages:

```ts
await courierClient.inbox.getMessages();
await courierClient.inbox.getArchivedMessages();
await courierClient.inbox.read({ messageId });
await courierClient.inbox.unread({ messageId });
await courierClient.inbox.archive({ messageId });
await courierClient.inbox.readAll();
```

**Preferences** — read and update user notification preferences:

```ts
await courierClient.preferences.getUserPreferences();
await courierClient.preferences.putUserPreferenceTopic({
  topicId: "HVS...",
  status: "OPTED_IN",
  hasCustomRouting: true,
  customRouting: ["inbox", "push"],
});
```

**Brands** — read custom brand settings:

```ts
await courierClient.brands.getBrand({ brandId: "YF1..." });
```

**Lists** — subscribe and unsubscribe users:

```ts
await courierClient.lists.putSubscription({ listId: "your_list_id" });
await courierClient.lists.deleteSubscription({ listId: "your_list_id" });
```

## Documentation

Full documentation: **[courier.com/docs/sdk-libraries/courier-js-web](https://www.courier.com/docs/sdk-libraries/courier-js-web/)**
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## Share feedback with Courier

Have an idea or feedback about our SDKs? Let us know!

Open an issue: [Courier Web Issues](https://github.com/trycourier/courier-web/issues)