How can i get response size of headers REST API - node.js

Question

I know in headers we can get content length, which indeed gives Content body length But I need Response size of headers
For example:
API Response =
{
"1": 1
}
If I print console.log(res.getHeader('content-length')); it gives 7 which is content length of body.
But I need response size of header which is 377Bytes(header + body) as shown in postman

Answer 1

One of the possible way to get the bytes of file is to download it , by using curl command in the following mannner:
curl -so /dev http://www.yourip.org/http-your-file/ -w '%{size_download}'
where -w/--write-out
defines what to display after a completed and successful operation

Answer 2

There is a NPM module to get object sizeof, you can install it with npm install object-sizeof
var sizeof = require('object-sizeof');
// 2B per character, 6 chars total => 12B
console.log(sizeof({abc: 'def'}));
// 8B for Number => 8B
console.log(sizeof(12345));
var param = {
'a': 1,
'b': 2,
'c': {
'd': 4
}
};
// 4 one two-bytes char strings and 3 eighth-bytes numbers => 32B
console.log(sizeof(param));
You can use it however you want in your code.
Example ::
console.log(sizeof(response.body));