Unable to retrieve length of an entity of JSON data in JavaScript

Question

I'm supposed to read certain data from a JSON file :

enter image description here

I'm able to print the correct value for :

console.log('data1 ' + data.entry[0].id);
console.log('data2 ' + data.entry[0].content.properties.yyn);

However, I want to find the length of the properties instead of reading each entity inside properties. I tried:

console.log('data2 ' + data.entry[0].content.properties.length);

It did not work!

score -1 · Answer 1 · answered Jan 09 '20 at 12:20

-1

console.log('data2 ' + Object.keys(data.entry[0].content.properties).length);

answered Jan 09 '20 at 12:20

uiTeam324

Hi,its still not working with this comment – Dodo dodo Jan 09 '20 at 12:24
@Dodododo Throwing any error? – uiTeam324 Jan 09 '20 at 12:26
Uncaught TypeError: data.entry[1].content.properties.size is not a function – Dodo dodo Jan 09 '20 at 12:27
That means entry[1] doesn't have content / content.properties . Please check the JSON you are using or share a JSfiddle link with your data – uiTeam324 Jan 09 '20 at 12:30
Thanks Everyone.This was helpful.The error was due to some other piece of code – Dodo dodo Jan 09 '20 at 12:32

score -1 · Answer 2 · answered Jan 09 '20 at 12:21

-1

If you want to know how many keys your object has, use Object.keys(obj).length

answered Jan 09 '20 at 12:21

mrblue

score -1 · Answer 3 · answered Jan 09 '20 at 12:21

-1

Properties is an object, not an array. You can count the length of its keys:

const numOfProps = Object.keys(data.entry[0].content.properties).length;

answered Jan 09 '20 at 12:21

3 Answers3