---
title: "defineAuthResolver()"
description: "Define a custom auth resolver for a specific integration"
---

Auth Resolvers allow you to inject the authentication credentials of **your users**, using a third-party service like [Clerk](https://clerk.com/) or [Nango](https://www.nango.dev/) or your own custom solution.

See our [Bring-your-own Auth Guide](/documentation/guides/using-integrations-byo-auth) for more about how this works.

<RequestExample>

```ts example
client.defineAuthResolver(slack, async (ctx) => {
  if (!ctx.account?.id) {
    return;
  }

  const tokens = await clerk.users.getUserOauthAccessToken(ctx.account.id, "oauth_slack");

  if (tokens.length === 0) {
    throw new Error(`Could not find Slack auth for account ${ctx.account.id}`);
  }

  return {
    type: "oauth",
    token: tokens[0].token,
  };
});
```

</RequestExample>

## Parameters

<ParamField body="integration" type="TriggerIntegration" required>
  The Integration client (e.g. `slack`) to define the auth resolver for.
</ParamField>

<ParamField body="resolver" type="AuthResolver" required>
  The resolver function to use for this integration. Should return a [AuthResolverResult](#authresolverresult) object.

{" "}

<Expandable title="arguments" defaultOpen>
  <ParamField body="ctx" type="TriggerContext" required>
    The [TriggerContext](/sdk/context) object for the run that is requesting authentication.
  </ParamField>
  <ParamField body="integration" type="TriggerIntegration">
    The Integration client that is requesting authentication.
  </ParamField>
</Expandable>

</ParamField>

## AuthResolverResult

<ParamField body="type" type="string" required>
  Should be either "apiKey" or "oauth"
</ParamField>

<ParamField body="token" type="string" required>
  The authentication token to use for this integration.
</ParamField>

<ParamField body="additionalFields" type="Record<string, string>">
  Additional fields to pass to the integration.
</ParamField>