Fix of Angular-cli 'JavaScript heap out of memory' error while running 'ng serve'

First option:
Run node command as:
node --max_old_space_size=8048 ./node_modules/@angular/cli/bin/ng serve
where 8048 is new memory limit in megabytes (by default it's ~1500).

Or add the command to package.json file:

"build-serve": "node --max_old_space_size=8048 ./node_modules/@angular/cli/bin/ng serve"

and run as npm run build-serve

Second option:
The quick and effective solution for Windows
Open C:\Users\userName\%AppData%\Roaming\npm
Copy/paste the following code into ng.cmd:

@IF EXIST "%~dp0\node.exe" (
    "%~dp0\node.exe" --max_old_space_size=8048 "%~dp0\node_modules\@angular\cli\bin\ng" %* 
) ELSE (
    @SETLOCAL 
    @SET PATHEXT=%PATHEXT:;.JS;=;% 
    node --max_old_space_size=8048 "%~dp0\node_modules\@angular\cli\bin\ng" %* 
)

UPD (7 May 2020)
Third option:
Set it as an environment variable.
SET NODE_OPTIONS=--max_old_space_size=8048
Thanks to @jonyadamit for sharing

Cheers!

Comments

[Hardik5Bavishi]

Thanks man!

2nd option helps me a lot.

It works now.

:)

[Sampath Lokuge]

This helps me a lot. Thanks a lot!

i.e. 1st option worked for me.

[Scott Hardy]

I don't think this is correct and only a bandaid solution for local development. CircleCI and TraviisCI have memory limits for their containers. I know CircleCI is 4GB (at least in the most common tier). I also think giving 8Gbs of swap to nodeJS is not a good idea given developers will be running other memory heavy applications (IDE, Browser etc.. ) and most developers (if lucky) will have 16GBs of memory.

[Nilesh Sutar]

Thanks man, it helps me a lot...!

[PritiMaurya]

Why this error is come ?
what is root couse of this error?

[Andrei Fedotov]

The root of this problem lies in the insufficient amount of allocated memory for the application. This can happen when, for example, an application is quite large like an enterprise application. And there is not able to specify the heap allocation size with the help of ng command. However Node can be used not only to serve the application but also to perform such things like allocating more memory to the app.

[Wayne Fair]

You're a life-saver! Thanks!

[kannanATexcelforte]

You are the master indeed !
Thanks a lot.

[Jonathan Adamit]

Thanks!
Option #3: Set it as an environment variable.
SET NODE_OPTIONS=--max_old_space_size=8048

[Andrei Fedotov]

Thanks for sharing! I added it into the note.

[Samee Ullah]

Welldone, I just run this command in CMD "node --max_old_space_size=8048 ./node_modules/@angular/cli/bin/ng serve" And it's work for me :-)

[Ivan Lysianok]

Thanks a lot :) First option worked for me.

[SAFIR]

It worked for me too. Thanks @andreisfedotov