Chrome Console: VM

Question

When executing a script directly in the console in Chrome, I saw this:

enter image description here

Does anyone know what's the meaning of VM117:2

What does VM stand for ?

Possible duplicate of http://stackoverflow.com/questions/17367560/chrome-development-tool-vm-file-from-javascript — Ethan Selzer, Dec 05 '13 at 00:23
is there a way to remove it/disable printing it? often totally useless for me. i just want to copy links or data from the console, mostly logged XHRs. — computingfreak, Jan 20 '17 at 01:11
@computingfreak This is a shot in the dark since the comment thread is so old, but have you managed to figure out how to disable it? I'm getting it printed 20+ times for every page load and it's driving me crazy! — MRB, Apr 09 '21 at 17:52
@MRB I found a solution, added as an answer to this question - please check at https://stackoverflow.com/a/67026569/1818089 — computingfreak, Apr 09 '21 at 18:34
@MRB not sure whether my answer would be kept, please see https://stackoverflow.com/questions/36009071/how-to-omit-file-line-number-with-console-log, and acknowledge somehow. — computingfreak, Apr 09 '21 at 18:42
@computingfreak I am so appreciative that you responded! I was more so wondering if you had figured out how to disable the debugger from logging. My debugger is running 20+ times in a row and filling the console w/ print statements. More explained here: https://stackoverflow.com/questions/67024539/how-to-stop-chrome-devtools-debugger-from-logging-repeatedly-in-the-console — MRB, Apr 10 '21 at 12:50

score 55 · Accepted Answer · edited Jun 22 '15 at 09:23

55

It is abbreviation of the phrase Virtual Machine. In the Chrome JavaScript engine (called V8) each script has its own script ID.

Sometimes V8 has no information about the file name of a script, for example in the case of an eval. So devtools uses the text "VM" concatenated with the script ID as a title for these scripts.

Some sites may fetch many pieces of JavaScript code via XHR and eval it. If a developer wants to see the actual script name for these scripts she can use sourceURL. DevTools parses and uses it for titles, mapping etc.

edited Jun 22 '15 at 09:23

Eliran Malka

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answered Dec 05 '13 at 07:24

loislo

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Is there a reference on this? – Jānis Elmeris Oct 24 '18 at 17:28

score 2 · Answer 2 · edited Apr 09 '21 at 18:39

Thanks to @MRB,

I revisited this problem, and found the solution today, thanks to https://stackoverflow.com/a/63221101/1818089

queueMicrotask (console.log.bind (console, "Look! No source file info..."));

It will group similar elements, so make sure you add a unique identifier to each log line to be able to see all data.

Demonstrated in the following example.

Instead of

data = ["Apple","Mango","Grapes"];
for(i=0;i<10;i++){
    queueMicrotask (console.log.bind (console, " info..."+i));
}

use

data = ["Apple","Mango","Grapes"];
for(i=0;i<data.length;i++){
    queueMicrotask (console.log.bind (console, " info..."+i));
}

A better way would be to make a console.print function that does so and call it instead of console.log as pointed out in https://stackoverflow.com/a/64444083/1818089

// console.print: console.log without filename/line number
console.print = function (...args) {
    queueMicrotask (console.log.bind (console, ...args));
}

Beware of the grouping problem mentioned above.

Chrome Console: VM

2 Answers2