#FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

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red hornet
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Getting the above error when building my app, I am using netlify, sanity and astro what could be the cause, there are not many pages or assets

placid mantleBOT
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Hi @red hornet. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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The error message “FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory” typically indicates that the Node.js process running your Astro build has run out of memory. While your project may not have many pages or assets, this can still occur due to issues such as:

  • Memory leaks in dependencies or build tools.
  • Large or complex data processing during build (e.g., fetching lots of data from Sanity).
  • Misconfiguration or bugs in the build pipeline.

The official Astro documentation does not provide a direct solution for this specific error, but it does recommend the following general troubleshooting steps:

  1. Check for Known Issues:
    Visit the Astro open issues to see if others have reported similar problems, especially with Netlify or Sanity integrations. You can also file a bug report if you believe this is an Astro issue. Providing a minimal reproduction of your problem is highly recommended for effective support Creating minimal reproductions.

  2. Minimal Reproduction:
    Try to isolate the problem by creating a minimal Astro project that reproduces the error. This helps determine if the issue is with Astro, a specific integration (like Sanity), or your project setup Creating minimal reproductions.

  3. Community Support:
    If you need more help, you can ask in the Astro Discord support channel and provide details about your setup and the error Need more?.

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  1. Check Build Configuration:
    Ensure your build process is not unintentionally loading large datasets or assets into memory. If you are using Sanity, check if you are fetching more data than necessary during the build.

  2. Node.js Version:
    Make sure you are using a supported Node.js version as required by Astro and Netlify (Set a Node.js version).

If the problem persists and you can reliably reproduce it, consider opening an issue with Astro, including a minimal reproduction and details about your environment.

I'm sorry, but the knowledge sources do not contain a specific fix for this error. However, following the above steps should help you narrow down the cause and get more targeted support.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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