node.js not working Object.keys

Question

var list = {"you": 100, "me": 75, "foo": 116, "bar": 15};
keysSorted = Object.keys(list).sort(function(a,b){return list[a]-list[b]})
alert(keysSorted);     // bar,me,you,foo

from Sorting JavaScript Object by property value

I'm doing Object sorting. Above source working in Javascript. But not working in Node.js. I have an error like this.

keysSorted = Object.keys(list).sort(function(a,b){return list[a]-list[b]})
                    ^
TypeError: Object.keys is not a function

I don't know why. Please help me.

Are you redeclaring Object somewhere? like var Object = 'something else';? Not sure how Node would react to that but seeing TypeError: Object.keys is not a function leaves me just that option... — Sergio
– Sergio, Commented Nov 13, 2016 at 8:25
Tested in node 6.2.2 and you can actually do var Object = 'something else'; and erase the Object native value.... can that be your problem? Check your variables... — Sergio
– Sergio, Commented Nov 13, 2016 at 8:27
OMG!!!!!!! I found my mistake. I declared var Object = 'requrie file';. Thank u so much guys. You're genius. — firepunch
– firepunch, Commented Nov 13, 2016 at 13:51

galkin · Accepted Answer · 2016-11-13 12:13:30Z

3

Most likely, you are using an out-dated Node.js version, v0.10 or v0.12. To check the version try running node -v.

This old version doesn't support Object.keys. You can check supported features for every Node.js versions here.

My advice is to update to Node.js version to 6.9.1. This version is current LTS (Long-term support).

edited Nov 13, 2016 at 12:13

user663031

answered Nov 13, 2016 at 10:45

galkin

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4 Comments

Sergio Over a year ago

Object.keys() on objects works just fine with node v0.10.

firepunch Over a year ago

As you say, I update node.js to 6.9.1. But still not workingTT. appearing same error .

firepunch Over a year ago

I solve it. I declared var Object; Anyway thank you answering! :)

fregante Over a year ago

This is incorrect. Object.fit() works fine on Node 0.10

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