Print Object like console.log (with a lot of information) in javascript

Question

I need to send an email that contains the console.log output of a JS object. Here a code example:

let array_multi = [];
array_multi["07:00"] = ["one","two","three"];
array_multi["08:00"] = ["foo","bar","foo"];
array_multi["09:00"] = ["lorem"];
console.log(array_multi);

In my console result like this:

Is there some method to get this output in plain text, or should I write a custom parsing function?

Answer 1

If you are using JSON.stringify , you'll get the complete data, however there are a few downsides:

• Arrays string properties, functions and other data structures get ignored completely (therefore serializing your data as is won't work¹)
• circular references fail to serialize
• There is no way to see inheritance from that

In your case you could do:

 let array_multi = {}; array_multi["07:00"] = ["one","two","three"]; array_multi["08:00"] = ["foo","bar","foo"]; array_multi["09:00"] = ["lorem"]; // logs as object console.log(array_multi); console.log(typeof array_multi); // parse and convert to string console.log(JSON.stringify(array_multi)); console.log(typeof JSON.stringify(array_multi));

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In Node.js you've got another option, which is util.format , which will return the same content as a string that you can see in the Node.js console. While it does give you a great insight into the different datatypes and relationships, it cannot show you the same infinite tree that an interactive console is able to show, so it will only show you a small part of the big picture.

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¹: Your array_multi should actually be an object, not an array, as arrays should only have numeric keys.

Answer 2

After a lot of search the right method is write a custom function (chrome have once inside dev tools core)
here the solution:

 let array_multi = []; array_multi["07:00"] = ["one","two","three"]; array_multi["08:00"] = ["foo","bar","foo"]; array_multi["09:00"] = ["lorem"]; function print_js_element(elm, show_content = false){ let output_res = "{\\n"; let object_keys = Object.keys(elm); object_keys.some(function(key,index) { output_res += "\\t" + key + ": (" + elm[key].length + ")"; if(show_content){ output_res += " " + JSON.stringify(elm[key]); } output_res += "\\n"; }); output_res += "\\n}"; return output_res; } console.log(print_js_element(array_multi,false)); console.log(print_js_element(array_multi,true));

Answer 3

Covert this array into an object first:

 let array_multi = []; array_multi["07:00"] = ["one","two","three"]; array_multi["08:00"] = ["foo","bar","foo"]; array_multi["09:00"] = ["lorem"]; let arrObj = {...array_multi}; console.log(JSON.stringify(arrObj));