The "JavaScript Heap Out of Memory" and "Storage Full" errors mean your Phantom or Workspace has hit a capacity limit. "JavaScript Heap Out of Memory" means a single run consumed too much memory, usually because the result file grew too large. "Storage Full" means your overall Workspace storage is at capacity and no new launches or results can be saved. The fixes are to split inputs into smaller batches, clean up already-processed rows, delete unused Phantoms and files from the File Browser, and where needed, upgrade your plan for more storage.
This error is related to the "Process Terminated with SIGKILL" error, which is another memory-level failure. If your Phantom was force-stopped before showing a heap error, that article may apply.
Why you’re seeing this
You might see one of these messages during a Phantom run:
- "JavaScript Heap Out of Memory" → the Phantom couldn’t finish the task because the result file became too large.
- "Storage Full" → your PhantomBuster workspace has reached its storage limit, so no new launches or results can be saved.
These errors usually happen when:
- A Phantom processes too much data in a single launch.
- A result file grows too large to be handled.
- Your workspace storage is at full capacity.
- Duplicate or already-processed data keeps getting saved.
How to fix it
If you see “JavaScript Heap Out of Memory”
You can try one of the two approaches below:
-
Break your Phantom input into smaller batches:
- Split your spreadsheet into smaller files (e.g. ~1,000 rows each).
- Run them one after another with the same Phantom, or duplicate the Phantom to run in parallel.
-
Remove processed data from your Phantom input:
- Delete old or unused result files to free up space.
- Clean your input spreadsheet so it only contains new rows.
- This prevents the Phantom from reprocessing duplicates.
If you see “Storage Full”
-
Check your storage usage:
- Go to Resources to see your current storage.
-
Delete unused Phantoms (all plans):
- In your Dashboard, click the three dots on a Phantom and select Delete.
- Deleting a Phantom also deletes its results permanently. Save anything important first.
- In your Dashboard, click the three dots on a Phantom and select Delete.
-
Delete unnecessary files (paid plans only):
- Open your Phantom's console.
- Click the three dots in the top-right and select File Browser.
- Choose the files you want to delete and click Delete in the top-right corner.
→ It may take up to one hour for storage updates to reflect after deleting files or Phantoms.
Frequently asked questions
What does "JavaScript Heap Out of Memory" mean?
It means your Phantom ran out of memory during a single run because the result file became too large to process. It's a run-level memory error, not a workspace-wide issue.
What does "Storage Full" mean in PhantomBuster?
It means your entire Workspace has hit its storage limit. No new Phantom launches can save results until you free up space by deleting old Phantoms or files, or upgrade to a plan with more storage.
How is "Storage Full" different from "JavaScript Heap Out of Memory"?
"JavaScript Heap Out of Memory" is a single-run issue: one Phantom used too much memory to finish. "Storage Full" is a workspace-wide issue: your account has no disk space left for new launches. The first is fixed by splitting inputs; the second is fixed by deleting old files or upgrading.
Where can I check my current storage usage?
Open the Resources page in your Workspace to see how much storage you're using and how much is left on your plan.
Does deleting a Phantom also delete its results?
Yes. Deleting a Phantom permanently removes all of its results. If you need those results, download or save them before deleting.
How long does it take for storage to update after deleting files?
Storage updates may take up to one hour to reflect after deleting files or Phantoms. If usage still looks high right after a cleanup, wait an hour and check again.
Does my plan affect how much storage I have?
Yes. Higher plans include more Workspace storage. If you regularly hit the "Storage Full" error, upgrading to a higher plan (Grow or Scale) gives you more room. The File Browser is also only available on paid plans.
If the error keeps showing up
If you've cleaned up your files and storage but still see errors, get in touch with our Customer Care Team. Please include:
- The Phantom name and a link to the run
- The exact error message from the console
- A screenshot of the error or the size of your result file
- Your input file (if applicable)
- A link to the Phantom's console if you're unsure which file caused the error