Get Length and Keys of JavaScript Object

Question

I have a JavaScript object like:

myobj: "[
        {"id":"2027","street":"street name one"},
        {"id":"2515","street":"street name two"}
       ]"

How can I get the length and the list of keys in this object?

I've tried:

var keys = Object.keys(myobj).length;
console.log(keys);

but it always returns a length of "1"...why?

Answer 1

myobj looks like it's an Array with 2 elements, which both have 2 properties. If you want the number of properties of myobj[0] use:

var myobj = [
    { "id": "2027", "street": "street name one" },
    { "id": "2515", "street": "street name two", "foo": "bar" }
];
console.log(Object.keys(myobj[0]).length); // 2
console.log(Object.keys(myobj[1]).length); // 3

Object.keys on an Array will return the same value as it's .length property.

Object.keys([ "foo", "bar", "baz"]); // 3

Answer 2

i resolved using eval.

eval('var obj='+myobj);

to get the lenght i do:

var keys = Object.keys(obj).length;
console.log(keys);

to loop through elements:

for (i = 0; i < keys; i++) {
console.log(obj[i].id);
console.log(obj[i].street);
};