How to get the real console.log formatted output

Question

I tried solution suggested here How to get the console.log content as string in JavaScript

Problem is it's missing the full formatted output : it gives a, b, c instead whereas I'd like to get ["a", "b", "c"] for my case https://jsfiddle.net/eywjn9o8/

var logBackup = console.log;
var logMessages = [];

console.log = function() {
    logMessages.push.apply(logMessages, arguments);
    logBackup.apply(console, arguments);
};

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));
alert(logMessages)

You're alerting the array, which calls toString() on it implicitly. Certainly not what you're looking for. Use logBackup(logMessages); instead and it'll be closer to the actual console output. Or use alert(JSON.stringify(logMessages[0])) — user5734311
– user5734311, Commented Oct 9, 2021 at 12:27
Duplicate: JavaScript print array to string with brackets and quotes — user5734311
– user5734311, Commented Oct 9, 2021 at 12:31

Gkonst · Accepted Answer · 2021-10-09 12:36:18Z

1

Firefox and Google Chrome now have a built-in JSON object, so you can just say alert(JSON.stringify(logMessages)). This is not part of the Javascript language spec, so you shouldn't rely on the JSON object being present in all browsers, but for debugging purposes it's incredibly useful.

Source

answered Oct 9, 2021 at 12:36

Gkonst

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