nodejs increase heap size

How to Increase Heap Size in Node.js?

If you are working with large amounts of data or running memory-intensive applications, you may encounter "heap out of memory" errors in Node.js. To resolve this issue, you can increase the heap size of your Node.js application.

Method 1: Using Command Line Arguments

You can increase the heap size of your Node.js application by passing the --max-old-space-size flag followed by the desired value in megabytes (MB) as a command-line argument when running your script.

    node --max-old-space-size=4096 myscript.js
    

The above command sets the maximum heap size to 4 GB (4096 MB). You can adjust the value based on your application's memory requirements.

Method 2: Using Environment Variables

You can also use an environment variable called NODE_OPTIONS to set the maximum heap size for all Node.js applications on your system.

    export NODE_OPTIONS=--max-old-space-size=4096
    

The above command sets the maximum heap size to 4 GB (4096 MB) for all Node.js applications.

Note that this method affects all Node.js applications on your system, so be cautious when using it.

Method 3: Programmatically

If you want to set the heap size programmatically within your Node.js application code, you can use the v8 module.

    const v8 = require('v8');
    v8.setFlagsFromString('--max-old-space-size=4096');
    

The above code sets the maximum heap size to 4 GB (4096 MB) within your Node.js application code.

Remember to monitor your application's memory usage regularly and adjust the heap size accordingly to prevent "heap out of memory" errors.