@gitbook/adaptive

GitBook's adaptive content feature allows you to personalize your documentation based on visitor data. The @gitbook/adaptive SDK provides utilities to help facilitate passing data to GitBook for adapting your content.

This SDK includes both feature flag helpers for popular providers like LaunchDarkly and Reflag, as well as generic utilities for writing custom visitor data.

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Prerequisites

Make sure you have:

* A GitBook site with adaptive content enabled
* An active project on LaunchDarkly or Reflag
* A frontend project (React-based) where feature flags are available client-side

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Feature Flag Helpers

The SDK provides convenient helpers for popular feature flag providers to automatically sync flag values with GitBook's adaptive content system.

$3

#### 1. Install the GitBook + LaunchDarkly Integration

In GitBook, install the LaunchDarkly integration for your site.

#### 2. Add Your Access Credentials

In the GitBook integration settings, provide:

* Your project key
* A service access token from your LaunchDarkly account

#### 3. Install the GitBook Helper

``bash
npm install @gitbook/adaptive
`

#### 4. Configure the Client

`tsx
import { render } from 'react-dom';
import { withLaunchDarkly } from '@gitbook/adaptive';
import { asyncWithLDProvider, useLDClient } from 'launchdarkly-react-client-sdk';
import MyApplication from './MyApplication';

function PassFeatureFlagsToGitBookSite() {
const ldClient = useLDClient();

React.useEffect(() => {
if (!ldClient) return;
return withLaunchDarkly(ldClient);
}, [ldClient]);

return null;
}

(async () => {
const LDProvider = await asyncWithLDProvider({
clientSideID: 'client-side-id-123abc',
context: {
kind: 'user',
key: 'user-key-123abc',
name: 'Sandy Smith',
email: 'sandy@example.com',
},
options: {}
});

render(



,
document.getElementById('reactDiv')
);
})();
`

#### Visitor Schema Output

Once connected, feature flag values will be available in GitBook under:

`
unsigned.launchdarkly.flags
`

$3

#### 1. Install the GitBook + Reflag Integration

In GitBook, enable the Reflag integration for your site.

#### 2. Add Your Secret Key

In the GitBook integration settings, provide your Reflag secret key.

#### 3. Install the GitBook Helper

`bash
npm install @gitbook/adaptive
`

#### 4. Configure the Client

`tsx
import { withReflag } from '@gitbook/adaptive';
import { ReflagProvider, useClient } from '@reflag/react-sdk';
import MyApplication from './MyApplication';

function PassFeatureFlagsToGitBookSite() {
const client = useClient();

React.useEffect(() => {
if (!client) return;
return withReflag(client);
}, [client]);

return null;
}

export function Application() {
const currentUser = useLoggedInUser();
const appConfig = useAppConfig();

return (
publishableKey={appConfig.reflag.publishableKey}
user={{
id: currentUser.uid,
email: currentUser.email ?? undefined,
name: currentUser.displayName ?? '',
}}
company={{
id: currentUser.company.id,
}}
>



);
}
`

#### Visitor Schema Output

Once connected, feature flag values will be available in GitBook under:

`
unsigned.reflag.flags
`

---

Generic Utilities

If you don't use LaunchDarkly or Reflag, or need to pass custom data beyond feature flags, the SDK provides generic utilities for writing visitor data.

$3

The writeGitBookVisitorCookie function allows you to write custom visitor data that will be available in GitBook's adaptive content system.

`tsx
import { writeGitBookVisitorCookie } from '@gitbook/adaptive';

// Write custom visitor data
writeGitBookVisitorCookie('userPlan', 'premium');
writeGitBookVisitorCookie('userRole', 'admin');
writeGitBookVisitorCookie('preferences', {
theme: 'dark',
language: 'en'
});
`

The data will be available in GitBook under:

`
unsigned.{cookieName}
`

For example, the above code would create:
- unsigned.userPlan with value "premium"
- unsigned.userRole with value "admin"
- unsigned.preferences with value { theme: "dark", language: "en" }`

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Important Note

All visitor data is evaluated on the client side and stored in cookies. Do not pass sensitive or security-critical data through this method.