How Javascript/Node.js engine store JSON in memory?

I have a 70 MB JSON file, which I read from a Node.js script and assign to a variable.

console.log(process.memoryUsage());
let data=require('../newJSON.json');
console.log(process.memoryUsage());

Output:

{ rss: 28184576,
  heapTotal: 6283264,
  heapUsed: 4199672,
  external: 8252 }
{ rss: 724721664,
  heapTotal: 695595008,
  heapUsed: 663708016,
  external: 8252 }

It seems that 70 MB JSON takes 632 MB of memory. I am interested in understanding how does JSON is stored into memory by Node Js/ Javascript?

How Javascript/Node.js engine store JSON in memory?

1 Answers