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FATAL ERROR: JavaScript heap out of memory How to fix it.

Node ran out of memory during the build. This usually means a very large bundle. Shrink it, or raise Node's memory limit in the build script.

How the Agent API works
What you see
FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of
memory
<--- Last few GCs --->
  • What it meansNode ran out of memory
  • Fix oneShrink the bundle
  • Fix twoRaise Node's memory limit
  • Look forA dependency you do not need

What it means

Node.js limits how much memory a process can use. During your build, a step grew past that limit and stopped. This usually means a very large bundle: many files, large images imported as code, or a package pulled in that does not need to be.

How to fix it

  1. Remove what you do not need

    Look for a large dependency that is imported only for one small use, large data files imported into code, or a whole library imported instead of one function.

  2. Raise Node's memory limit in the build script

    Set NODE_OPTIONS=--max-old-space-size in your build script. The number is in megabytes.

    package.json
    {
  "scripts": {
    "build": "NODE_OPTIONS=--max-old-space-size=4096 next build"
  }
}

  3. Build again

    The build server has a limited amount of memory, so raising the limit only helps up to what it has. A smaller bundle is the more reliable fix.

01Questions

Memory questions, answered.

Anything else? Write to us and a person answers.

support@antideploy.com
Why does it only fail online?

Your computer may have more memory available to the build than the build server has.

Is this the same as the app running out of memory?

No. This is the build. If the app runs out of memory while it runs, see the app ran out of memory while starting.

Does this failed deploy cost anything?

No. Failed deploys never count against your plan.

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Facts on this page were checked against the live platform on 7 October 2026.

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