How to extract object keys [duplicate]

Question

I have this following object:

{ 12232: [], 34232: [], 23435: [] }

I want to extract the keys from this object to show them as labels in my React frontend. How can I accomplish this?

There's no such thing as a JSON Object. JSON is a text format. What you have there is an object literal, and you can use Object.keys(theObject) to get an array of keys. — user5734311
– user5734311, Commented Sep 15, 2020 at 5:40
"JavaScript Object Notation Object." If there's something wrong with this, I don't see it. I would say { foo: 'bar' } is a JSO but not a JSON, while { "foo": "bar" } is both. — GirkovArpa
– GirkovArpa, Commented Sep 15, 2020 at 5:44
@GirkovArpa OP talks about JSON Objects, which makes no sense. It's also not JSON, it's just an object literal. — user5734311
– user5734311, Commented Sep 15, 2020 at 5:45
@user2426691 W3 schools is notoriously misleading and plain wrong in many cases, this one included. — VLAZ
– VLAZ, Commented Sep 15, 2020 at 5:47
@ChrisG Ok thanks for the heads up, i'll delete the entire question while I'm at it as it is a duplicate — user2426691
– user2426691, Commented Sep 15, 2020 at 5:47

ArnaudV · Accepted Answer · 2020-09-15 05:40:26Z

The method Object.keys() allows you to loop over the keys of an object. You should be able to use it in order to get what you want.

Ahmad · Accepted Answer · 2020-09-15 05:41:49Z

Use JS built-in Object.keys() for that.

const myObject = { 12232: [], 34232: [], 23435: [] }; const keys = Object.keys(myObject); keys.forEach(key => { console.log(key); });

maya_nk99 · Accepted Answer · 2020-09-15 05:42:21Z

You can always use

 obj = { abc: "1", def: "2" } console.log(Object.keys(obj))

It will log ["abc", "def"]. Then you can map through this array and display the values as required.

Prateek Thapa · Accepted Answer · 2020-09-15 05:39:37Z

You could use Object.keys to extract the keys out of your object.

You could check the docs of Object.keys here

const obj = { 12232 : [], 34232 : [], 23435: [] } Object.keys(obj); // returns ['12232', '34232', '23435'];

4 Answers 4