Utilizing only JavaScript to parse JSON data

Question

Utilizing only JavaScript to parse JSON data

I couldn't find a similar question that was detailed enough.

Currently, I have an ajax call that accesses a php page and receives the response:

echo json_encode($cUrl_c->temp_results);

This response looks something like this:

{"key":"value", "key2":"value"}

To work with this output, it is "parsed" using:

var json_response = JSON.parse(xmlhttp.responseText);

I am trying to figure out how to iterate through this response and extract both the key and the value using only Javascript.

Is the returned output considered valid JSON?
How can I loop through it without using jQuery, just plain Javascript?

javascript json parsing loops

Answer 1

Answer №1

When you need to loop through the items of an object, you typically utilize a for..in loop. This loop allows you to access both the keys (property names) and the property values:

for (var key in object) {
    var item = object[key];
}

It's worth noting that {"key":"value", "key2":"value"} is considered valid JSON.

Answer 2

When you need to loop through the items of an object, you typically utilize a for..in loop. This loop allows you to access both the keys (property names) and the property values:

for (var key in object) {
    var item = object[key];
}

It's worth noting that {"key":"value", "key2":"value"} is considered valid JSON.

Answer 3

Answer №2

Yes, the JSON is considered valid once parsed with JSON.parse(). For information on retrieving keys and values, you can refer to the for...in documentation on MDN.

One method demonstrated in the documentation involves using a function to display the properties of an object:

Example 1

var obj = {a:1, b:2, c:3};

function displayProperties(obj, objName) {
  var result = "";

  for (var property in obj) {
    result += objName + "." + property + " = " + obj[property] + "\n";
  }

  return result;
}

alert(displayProperties(obj, "obj")); /* alerts: obj.a = 1 obj.b = 2 obj.c = 3 */

Answer 4

Yes, the JSON is considered valid once parsed with JSON.parse(). For information on retrieving keys and values, you can refer to the for...in documentation on MDN.

One method demonstrated in the documentation involves using a function to display the properties of an object:

Example 1

var obj = {a:1, b:2, c:3};

function displayProperties(obj, objName) {
  var result = "";

  for (var property in obj) {
    result += objName + "." + property + " = " + obj[property] + "\n";
  }

  return result;
}

alert(displayProperties(obj, "obj")); /* alerts: obj.a = 1 obj.b = 2 obj.c = 3 */

Utilizing only JavaScript to parse JSON data

Answer №1

Answer №2

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