---
title: RudderStack
description: Load the RudderStack JavaScript SDK after measurement consent with
  the c15t rudderstack helper, or map c15t categories to destination consent
  IDs, and check each mode.
icon: rudderstack
group: integrations
lastModified: "2026-10-10T16:01:45+01:00"
---
## Configure RudderStack

Copy the source write key and the HTTPS data plane URL from your RudderStack
source. Keep control-plane credentials out of the browser.

|Package manager|Command|
|:--|:--|
|npm|`npm install @c15t/integrations@alpha`|
|pnpm|`pnpm add @c15t/integrations@alpha`|
|yarn|`yarn add @c15t/integrations@alpha`|
|bun|`bun add @c15t/integrations@alpha`|

```ts title="src/consent-scripts.ts"
import { rudderstack } from '@c15t/integrations/rudderstack';

export const scripts = [
	rudderstack({
		writeKey: 'YOUR_SOURCE_WRITE_KEY',
		dataPlaneUrl: 'https://your-data-plane.example.com',
	}),
];
```

## Register the scripts

Complete your [framework quickstart](/docs/frameworks) first. Keep its Inth
endpoint, policy, styles and consent UI. Remove the vendor's original script,
SDK initializer or tag-manager entry, so the vendor loads only through c15t.

The vendor pages put the helper in `src/consent-scripts.ts`. If your framework
quickstart already has a `scripts` array, such as the one in `c15t.config.ts`
in the Next.js guide, add the helper to that array instead of creating a
second file.
The `scripts` export is a configuration, not an initializer. Add it to the c15t provider you already have, at the registration
point for your framework below. These are edits to that provider, not a second
provider.

**Next.js**

Add the configuration to `scripts` in `c15t.config.ts`, next to
`next.config.ts`:

```ts title="c15t.config.ts"
import { defineConsentConfig } from 'c15t/next';
import { scripts } from './src/consent-scripts';

export default defineConsentConfig({ scripts });
```

Keep the rest of your config, such as `mode` and `routePrefix`, in the
same call. `ConsentRoot` reads the config in the browser, so the layout
keeps passing only `state`. App Router, Pages Router and static export all
read the same file. See
[Next.js scripts and embeds](/docs/frameworks/next/scripts).

**TanStack Start**

Import the configuration into your root route and pass it to the existing
`ConsentRoot` as a top-level prop. Keep the loader from the
[TanStack Start quickstart](/docs/frameworks/tanstack-start/quickstart):

```tsx title="src/routes/__root.tsx"
import { scripts } from '../consent-scripts';

<ConsentRoot state={consent} scripts={scripts}>
```

Import vendor helpers in the root route module, not in a server function.
A server function's return value must be serializable, and script
configurations carry callbacks. See
[TanStack Start scripts](/docs/frameworks/tanstack-start/scripts).

**React**

Add the configuration to the existing `ConsentProvider` options, next to
`mode`:

```tsx title="src/consent.tsx"
import { scripts } from './consent-scripts';

<ConsentProvider options={{ mode, scripts }}>
```

`mode` is the `manifest()` value from the
[React quickstart](/docs/frameworks/react/quickstart). Keep the banner,
dialog and preferences link inside the provider. See
[React scripts and embeds](/docs/frameworks/react/scripts).

**Nuxt**

Register the scripts under the `c15t` key in `app/app.config.ts`. Adjust the
relative import to where you created `consent-scripts.ts`:

```ts title="app/app.config.ts"
import { scripts } from '../src/consent-scripts';

export default defineAppConfig({
  c15t: { scripts },
});
```

The Nuxt module merges this over its options in `nuxt.config.ts` and starts
one script loader in the browser after hydration, once it has applied the
visitor's stored choice and privacy signals. Keep `scripts` out of
`nuxt.config.ts`, which reaches the browser as JSON and drops the vendor
callbacks. Write the vendor IDs into `consent-scripts.ts`. See
[Nuxt scripts and embeds](/docs/frameworks/nuxt/scripts).

**Vue**

Pass the scripts to the existing `c15tVue` plugin call in `src/main.ts`:

```ts title="src/main.ts"
import { c15tVue, manifest } from 'c15t/vue/vue-plugin';
import { scripts } from './consent-scripts';

app.use(c15tVue, {
  mode: manifest(),
  scripts,
});
```

Keep your existing `mode` and other options. The plugin starts one
script loader when the app mounts, after it has applied the visitor's stored
choice. Do not also call `createScriptLoader` from a component. See
[Vue scripts and embeds](/docs/frameworks/vue/scripts).

**Astro**

Add the scripts to the client entrypoint from the
[Astro quickstart](/docs/frameworks/astro/quickstart), `src/c15t.client.ts`,
which the integration finds on its own. Keep `astro.config.mjs` as it is.
If the module already exports scripts, combine the two arrays.

```ts title="src/c15t.client.ts"
import type { C15tClientOptionsExtension } from 'c15t/astro';
import { scripts } from './consent-scripts';

export default { scripts } satisfies C15tClientOptionsExtension;
```

Vendor helpers contain callbacks, and the integration options in
`astro.config.mjs` are serialized into the page, so do not put helpers in
the integration's `scripts` option. The integration passes the client
entrypoint to the one runtime every page shares, including across
`ClientRouter` navigation.

**Svelte**

Import the scripts in the component that owns your existing provider and
pass them as a top-level prop:

```svelte title="src/App.svelte"
<script lang="ts">
  import { ConsentProvider, manifest } from '@c15t/svelte';
  import { scripts } from './consent-scripts';
</script>

<ConsentProvider mode={manifest()} {scripts}>
  <!-- Keep your application, consent UI and preferences link here. -->
</ConsentProvider>
```

Retain the styles and consent UI from the [Svelte quickstart](/docs/frameworks/svelte/quickstart).
The provider owns the loader and disposes it on unmount.

**SvelteKit**

Add the scripts to the existing `ConsentRoot` in the root layout. Keep the
handle and the layout load from the [SvelteKit quickstart](/docs/frameworks/sveltekit/quickstart).

```svelte title="src/routes/+layout.svelte"
<script lang="ts">
  import { ConsentRoot } from '@c15t/svelte';
  import { scripts } from '../consent-scripts';

  let { children, data } = $props();
</script>

<ConsentRoot state={data.consent} {scripts}>
  {@render children()}
  <!-- Keep your consent UI and preferences link here. -->
</ConsentRoot>
```

Import vendor helpers in the layout component, not in `+layout.server.ts`:
a server load cannot send functions to the browser. Prerendered, static and
SPA-mode pages use the same `scripts` prop. If you pass an externally owned
`runtime` to the provider, register scripts when creating that runtime instead.

**HTML**

The helpers in `@c15t/integrations` are ES modules that need a bundler. On a
page that loads the c15t script tag, paste the vendor's own snippet instead
and keep it inert until its category is allowed:

```html
<script type="text/plain" data-c15t-category="measurement">
  // The vendor's snippet, unchanged
</script>
```

Use the category this guide names for the vendor. c15t runs the snippet
once that category is allowed, and reloads the page when the visitor
withdraws it. Helper options on this page, such as `loadMode`, do not apply
to a pasted snippet. See [HTML scripts](/docs/frameworks/html/scripts).

**JavaScript**

Pass the scripts to `init()` from `@c15t/browser`, next to your mode:

```ts
import { init, manifest } from '@c15t/browser';
import { scripts } from './consent-scripts';

const consent = init({
  mode: manifest(),
  scripts,
});
```

Keep the mode from your quickstart. With
`createConsentRuntime` from `c15t/runtime`, pass `scripts` to it instead.
A kernel you create yourself needs a loader from
`c15t/modules/script-loader`. Attach one loader per kernel. See
[JavaScript scripts](/docs/frameworks/javascript/scripts).

## Options

|Option|Default|Behavior|
|--|--|--|
|`writeKey`|Required|Source write key. Surrounding whitespace is trimmed. An empty value logs an error and the script does not load.|
|`dataPlaneUrl`|Required|Data plane URL. A missing, invalid or non-HTTPS URL logs an error and the script does not load.|
|`consentManagement`|None|`{ mapping }` from c15t categories to RudderStack consent IDs. Switches to destination consent mode.|
|`loadOptions`|`{}`|Third argument to `rudderanalytics.load()`. Use JSON-serializable values only.|
|`trackPageView`|`true`|Queues `rudderanalytics.page()` before the loader.|
|`scriptUrl`|`https://cdn.rudderlabs.com/v3/modern/rsa.min.js`|Loader URL override. A non-HTTPS URL throws; a blank value uses the default.|

## Loading and revocation

`rudderstack` uses the `measurement` category. `consentManagement` picks the
mode:

|Mode|Loads|On consent change|On revocation|
|--|--|--|--|
|Default|After measurement is allowed, with `load` and `page` queued|Nothing|Removes the script element and calls no RudderStack API|
|`consentManagement`|On every page, in RudderStack's pre-consent state|Calls `rudderanalytics.consent()` with the mapped IDs|Keeps the SDK and calls `consent()` with the revoked IDs denied|

## Map destination consent

`consentManagement` loads the RudderStack SDK before the visitor chooses. Use
it only when every destination in your workspace carries a consent ID from the
mapping; c15t cannot check destination settings from the browser. Add the
mapping to the helper call:

```ts
rudderstack({
	writeKey: 'YOUR_SOURCE_WRITE_KEY',
	dataPlaneUrl: 'https://your-data-plane.example.com',
	consentManagement: {
		mapping: {
			measurement: ['YOUR_ANALYTICS_CONSENT_ID'],
			marketing: ['YOUR_ADVERTISING_CONSENT_ID'],
		},
	},
});
```

The helper sets `preConsent.enabled`, buffered event delivery and
`consentManagement.provider: 'custom'` in the load options. Storage defaults to
`{ strategy: 'none' }`; a `preConsent.storage` value in `loadOptions` replaces
it. Before `load`, the helper queues a `consent()` call. IDs of allowed
categories go to `allowedConsentIds` and IDs of denied categories go to
`deniedConsentIds`. A visitor who turns off the `rudderstack` vendor gets every
mapped ID denied. An empty mapping, or a category with no non-blank IDs, throws.

## Verify RudderStack

In the default mode, allowing measurement loads `rsa.min.js` with a
`data-rsa-write-key` attribute, and a page event goes to your data plane URL.

Test in a private window with an opt-in policy. Open DevTools Network, disable
the cache and filter by the vendor's domain:

1. Load the page. No request goes to the vendor before you choose.
2. Click Reject, then reload. There is still no vendor request.
3. Open Privacy settings and allow the helper's category. The vendor script
   loads without a page reload.
4. Turn the category off again and save. c15t reloads the page, and the new
   page makes no vendor request.

c15t reloads on revocation because removing a script element does not stop
code that already ran. The vendor's listeners, timers and queued events stay
alive until the page unloads. If you set `reloadOnConsentRevoked: false`, stop
the vendor yourself. Register a callback-only script whose `onConsentChange`
calls the vendor's opt-out API, as shown in
[custom integrations](/docs/integrations/building-integrations), and check the
permission before each of your own event calls. The reload does not delete
cookies the vendor already set; see
[clear on revocation for your framework](/docs/integrations/overview#vendor-switches-and-cookie-cleanup).

The helper sets `vendor` to its script ID, so once you declare that vendor a
visitor can turn it off inside an allowed category. See
[vendor consent for your framework](/docs/integrations/overview#vendor-switches-and-cookie-cleanup). The
[consent verification guide](/docs/guides/verify-consent) covers navigation,
expiry and hosting checks.

With `consentManagement`, the SDK loads before the choice, so check your
destinations instead. Test in a private window with an opt-in policy:

1. Load the page. `rsa.min.js` loads before you choose. Destinations whose
   consent IDs map to a denied category receive no events.
2. Open Privacy settings and allow measurement. Without a reload,
   destinations with measurement IDs start receiving events. Destinations
   mapped only to marketing still receive none.
3. Turn measurement off and save. c15t reloads the page, and destinations with
   measurement IDs receive no events from the new page.

See the [consent verification guide](/docs/guides/verify-consent) for
navigation and hosting checks.