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Fetch lets you enrich your Algolia data directly within a code transformation. Using a JavaScript function within your transformation, you can retrieve information from third-party APIs to enhance the quality and relevance of your search results. Using Fetch affects your record ingestion rate. To avoid slowing down your indexing process, ensure you use third-party APIs that are fast and reliable. Use Fetch for operations that can be completed quickly.
This feature isn’t available on every plan. Refer to your pricing plan to see if it’s included.

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Create a code transformation

  1. Go to the Algolia dashboard and select your Algolia .
  2. On the left sidebar, select Data sources.
  3. Open the Connectors page.
  4. Select a connector and click Connect to start creating your task.
  5. Create a new source or select an existing one.
  6. To create a transformation function, click Create transformation.

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Retrieve and store secrets

To call an external API, you typically need an API key or other credential type (such as basic access authentication or OAuth 2.0). You can store these credentials as a secret and reference them in your transformation code.
  1. Retrieve the secret from the third-party API.
  2. In your code transformation, click Secret.
  3. Paste in the third-party API key, give it name, then click Add.
You can now add the secret to your transformation code.
JavaScript

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How to use fetch helper functions

  1. Click Helper Functions.
  2. Select Fetch / API
  3. Select a helper and click Add.
You can either use third-party APIs directly or use a generic Fetch function.

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Third-party APIs

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Generic function

This function lets you connect to any service with an API.
There’s a timeout and response size limit on all transformations that include Fetch requests.
Last modified on May 19, 2026