How to get all key in JSON object (javascript)

Question

{"document":   {"people":[     {"name":["Harry Potter"],"age":["18"],"gender":["Male"]},     {"name":["hermione granger"],"age":["18"],"gender":["Female"]},   ]} } 

From this JSON example, I would like to get the keys such as name, age, gender for each people.

How to do this?

Answer 1

I use Object.keys which is built into JavaScript Object, it will return an array of keys from given object MDN Reference

var obj = {name: "Jeeva", age: "22", gender: "Male"} console.log(Object.keys(obj)) 

Answer 2

Try this

var s = {name: "raul", age: "22", gender: "Male"}    var keys = [];    for(var k in s) keys.push(k); 

Here keys array will return your keys ["name", "age", "gender"]