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I do this npm i -S json-size and then somewhere in my code.

import jsonSize from 'json-size'
console.log(jsonSize({foo: 'bar'})) //=> 13

This is what json-size is all about. github.com/bendrucker/json-size/blob/master/index…

'use strict'

var bytes = require('utf8-length')

module.exports = function jsonSize (value) {
  return bytes(JSON.stringify(value))
}

json-size has a dependency of utf8-lenghth which is nothing more than this. github.com/substack/utf8-length/blob/master/index…

module.exports = function(s) {
  return ~-encodeURI(s).split(/%..|./).length
}

We can do it all by ourself now.

const bytes = (s) => {
  return ~-encodeURI(s).split(/%..|./).length
}
const jsonSize = (s) => {​
  return bytes(JSON.stringify(s))
}
console.log(jsonSize({foo: 'bar'})) //=> 13

What's this tilde operator? joezimjs.com/javascript/great-mystery-of-the-tilde