How to convert objects to Array of objects

You can use several ES6 shorthands to produce the desired output in one expression:

Object.keys(data).map(key => ({[key]: data[key]}))

The following code snippet demonstrates this:

const data = {
  key0:'value0',
  key1:'value1',
  key2:'value2'
};

const output = Object.keys(data).map(key => ({[key]: data[key]}));

console.log(JSON.stringify(output));

Use Object.keys and Array#map methods.

var data = {
  key: 'value',
  key1: 'value',
  key2: 'value'
};

console.log(
  // get all object property names(keys)
  Object.keys(data)
  // iterate over the keys array
  .map(function(k) {
    // generate the obect and return
    var o = {};
    o[k] = data[k];
    return o;
  })
)

Try to do it this way:-

function json2array(json){
var output = [];
var keys = Object.keys(json);
keys.forEach(function(key){
    output.push(json[key]);
});
return output;}

You can use Object.keys to have the keys:

Object.keys(data)
console.log(Object.keys(data)[0]) // will print first key 

Or you can use Object.values to get the values:

Object.values(data)
console.log(Object.values(data)[0]) // will print first key value