How to use Object.values() on server side in Node.js

Question

Object.values() received following error:

TypeError: Object.values is not a function.

From this question on stackoverflow - I see that Object.values() is not supported in all browsers.

But I am using the function in Node.js on server side - How can I use Object.values() in Node.js it seems so intuitive like Object.keys()?

question was to find how to use Object.values() in node.js as mentioned in title. I have edited question to make it explicit in body as well. why the downvote its not the duplicate ? — npr, Nov 04 '16 at 11:55
I didn't downvote. Due to the unspecific nature, I thought it was a duplicate, which has now been retracted. — evolutionxbox, Nov 04 '16 at 11:57
as mentioned previously it wasn't unspecific - title clearly states the intent — npr, Nov 04 '16 at 11:59
because sometimes JS is actually stupid :) Object.values should have existed a decade ago lol — Alexander Mills, Dec 06 '17 at 00:52
I'm using node version `node -v v9.8.0` and I still get that same error. — Steven Aguilar, Apr 20 '18 at 15:50

score 72 · Accepted Answer · answered Nov 04 '16 at 11:48

72

Object.values is a new feature in ES2017. It is very bleeding edge. Node.js has full support for it from version 7.0.

6.8.1 supports it, but it is considered unstable and is locked behind the --harmony flag.

You can either:

Upgrade to the latest Node.js LTS and use --harmony
Upgrade to the latest Node.js Current
Use a polyfill

answered Nov 04 '16 at 11:48

Quentin

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Thanks, was able to fix my Heroku app with this answer. – Anthony Jul 26 '17 at 17:29
3

Use `node -v` to find out what version of Node you're using. – DawnPaladin Sep 12 '17 at 17:29

Yosvel Quintero Arguelles · Answer 2 · 2017-05-02T07:41:14.160

Object.values() is in status "Draft" for the version ECMAScript2017 and here the specification: ECMAScript 2017 Draft (ECMA-262) The definition of 'Object.values' in that specification..

The Object.values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).

Without change nothing in your NodeJS enviroment you can achive the same by using Object.keys() that returns an array of keys and chaining a Array.prototype.map() method to return the desired array of the Object's values:

const obj = { 
    foo: "bar", 
    baz: 42 
  },
  // Object.values()
  objValues = Object.values(obj),
  // Object.keys() and map(),
  objKeysMap = Object.keys(obj).map((k) => obj[k]);

console.log('objValues:', objValues);
console.log('objKeysMap:', objKeysMap);

score 11 · Answer 3 · answered Sep 01 '17 at 14:44

11

Lodash is a pretty awesome tool to simplify your JavaScript code. You can use _.values:

var _ = require('lodash');
_.values({ a: 'a' }) // => ['a']

answered Sep 01 '17 at 14:44

sakovias

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score 11 · Answer 4 · answered Mar 01 '18 at 11:39

11

I am developing a AWS Lambda and now I stumbeled over the same problem and I solved it by this simple line (assuming a is the object) const values = Object.keys(a).map(k => a[k]);

answered Mar 01 '18 at 11:39

thopaw

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You should check if it's not already defined for future proofing.. we're actually already in the future where it exists in newer node versions :) No reason to overwrite it when it's already defined. – OZZIE Feb 22 '19 at 07:34

score 4 · Answer 5 · edited Sep 11 '18 at 10:59

4

3 alternative to go around if you don't want to upgrade node

mapping keys as in this answer
using lodash as another answer by @sakovias
using this object.values npm package

edited Sep 11 '18 at 10:59

Anglepoise

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6

answered Oct 24 '17 at 03:12

Phong Nguyen

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score 4 · Answer 6 · answered Feb 22 '19 at 07:32

4

Here's a polyfill that kicks in only when it's not already defined:

const objectToValuesPolyfill = (object) => {
  return Object.keys(object).map(key => object[key]);
};
Object.values = Object.values || objectToValuesPolyfill;

answered Feb 22 '19 at 07:32

OZZIE

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score 0 · Answer 7 · answered May 17 '19 at 12:19

0

Upgrade your Node.js to the latest version. It'll enable you to use

Object.values()

You can get it from the official site: https://nodejs.org/en/download/current/

It worked for me :)

answered May 17 '19 at 12:19

Quince Ngomane

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10

score 0 · Answer 8 · answered Jan 03 '21 at 16:26

0

Or use underscore.js

var _ = require('underscore');

const obj = { 
    foo: "bar", 
    baz: 42 
  };

console.log(_.values(obj));
// ["bar",42]

answered Jan 03 '21 at 16:26

Tim Cullen

23
4

How to use Object.values() on server side in Node.js

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