JSON to dictionary in JavaScript?
Solution 1
Note that that is not valid JSON: you have to use double-quotes, not single-quotes.
Assuming you fix that, and that the JSON has already been retrieved into a string variable jsonResult
, you need to parse that to get an object using JSON.parse():
var result = JSON.parse(jsonResult);
You can build a dictionary from there:
var employees = {};
for (var i = 0, emp; i < result.employees.length; i++) {
emp = result.employees[i];
employees[ emp.id ] = emp;
}
console.log(employees[56].name); // logs "Harry"
console.log(employees[56].department); // logs "marketing"
You said "and the value is the (say) name" - if you don't need the department
values then in the for loop above say employees[ emp.id ] = emp.name;
and then (obviously) employees[56]
would give you "Harry" directly.
Demo: http://jsfiddle.net/RnmFn/1/
Solution 2
Well, assuming the JSON has already been parsed to an Object
:
var data = JSON.parse('{"status":"success","employees":[{},{},{}]}'); // abridged
You can loop over data.employees
to build the "dictionary" (Object
):
var employees = {};
for (var i = 0; i < data.employees.length; i++) {
employees[data.employees[i].id] = data.employees[i];
}
Then, given an employeeId
:
var employee = employees[employeeId];
Solution 3
You could write a javascript function to get an employee by id from a list of employees:
function getEmployee(id, employees) {
for (var i = 0; i < employees.length; i++) {
var employee = employees[i];
if (employee.id === id) {
return employee;
}
}
return null;
}
and then use this function on the response you got from the server after parsing the JSON string back to a javascript object:
var json = 'the JSON string you got from the server';
var obj = JSON.parse(json);
var employees = obj.employees;
var employee = getEmployee(34, employees);
if (employee != null) {
alert(employee.name);
}
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Updated on December 12, 2020Comments
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In my JS code, I need to convert the JSON response from server to a dictionary so that I can access them by key names. Here is the situation:
Say, this is the JSON response from my server:
{ 'status': 'success', 'employees' : [ { 'id': 12, 'name': 'Tom', 'department': 'finance' }, { 'id': 34, 'name': 'Dick', 'department': 'admin' }, { 'id': 56, 'name': 'Harry', 'department': 'marketing' } ] }
Now what i need is to create a dictionary variable such that the key is the id and the value is the (say) name so that i can access them variable.id or variable[id_value] (from a loop).
How can this be achieved? Your help highly appreciated.
Thanks Vivek Ragunathan