How do I iterate on a JSON file with javascript?

Question

I have this issue. I want to iterate through the attributes of a JSON structure, i.e this structure

var txt = '{"employees":{' +
'"p1":{'+
    '"info":{'+
        '"firstName":"John","lastName":"Doe" }},' +
'"p2":{'+
    '"info":{'+
        '"firstName":"Anna","lastName":"Smith" }},' +
'"p3":{'+
    '"info":{'+
        '"firstName":"Peter","lastName":"Jones" }}'+

'}}';

I dont want to do something like

json.employees.p1.info.firstName;

(using the p1) I want to do something like

for(var i = 0; i<3;++i){
    console.log(json.employees.p[i].info.firstName);
}

Does someone know how to do it?

I want to do that because the attribute p can be N not so I can't do p1, p2, p3, p4, ..., p101

Artem Petrosian · Accepted Answer · 2015-04-23 14:09:26Z

5

You can access properties of JavaScript objects using bracket notation. It is useful when you have to define property name using variable or expression.

So. for your situation, you could access the properties of employees like this:

json.employees['p'+(i+1)].info.firstName

edited Apr 23, 2015 at 14:09

answered Apr 27, 2014 at 15:56

Artem Petrosian

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Marius · Accepted Answer · 2014-04-27 15:56:11Z

0

You can iterate objects like so:

for (var k in your_object)
    console.log(your_object[k]);

So in your case, to iterate through all P objects:

for (var k in json.employees)
    console.log(json.employees[k]);

answered Apr 27, 2014 at 15:56

Marius

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