Parsing JSON with jQuery

Question

I am trying to parse this test.json (It does validates, so that doesn't appear to be an issue, it's in the same folder as the file containing the javascript below)

{
"mainunit": {
    "sensors": [
        {
            "id": "C9",
            "name": "Sensor 2",
            "tc": 71.3,
            "pair": null
        },
        {
            "id": "4A",
            "name": "Sensor 1",
            "tc": 106.7,
            "pair": null
        }
    ],
    "fans": null
}}

I'm trying to use this . . .

$.getJSON('test.json',function(data) {
$.each(data, function(i, learning) {

    alert(learning.mainunit.sensors[0].tc);

});});

This code is from a previous SO question, see link below.

I also have a general questions about this previous question regarding parsing json with jQuery.

Parse JSON in jquery

I can get this example to parse, but if I remove the beginning and ending square brackets it won't parse. Can someone clarify why. It appears that json doesn't need beginning and ending square brackets.

Thanks in advance.

You can use this to help you visualize your JSON: json.parser.online.fr — gen_Eric
– gen_Eric, Commented Aug 15, 2011 at 19:13

gen_Eric · Accepted Answer · 2011-08-15 19:15:08Z

3

The JSON data (which is an object) only contains one element: mainunit.

You don't need the $.each. Just do:

data.mainunit.sensors[0].tc; // 71.3

Your $.each will loop just once, and in that loop learning will be data.mainunit.

$.each(data, function(i, learning) {
    alert(i); // 'mainunit'
    alert(data.sensors[0].tc); // 71.3
});

EDIT: To loop through each sensor:

$.each(data.mainunit.sensors, function(i, sensor) {
    alert(sensor.tc);
});

edited Aug 15, 2011 at 19:15

answered Aug 15, 2011 at 19:08

gen_Eric

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1 Comment

swudev Over a year ago

I would use $.each to loop through each of the sensors right?

Alex Turpin · Accepted Answer · 2011-08-15 20:14:10Z

0

JSON objects need starting and ending brackets, and what you have in your file is a JSON object (a key/pair value).

edited Aug 15, 2011 at 20:14

answered Aug 15, 2011 at 19:00

Alex Turpin

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6 Comments

Alex Turpin Over a year ago

I thought his question was "but if I remove the beginning and ending square brackets it won't parse. Can someone clarify why."

gen_Eric Over a year ago

Ah, I just noticed that he was accessing the object incorrectly, I didn't see that part. BTW: JSON needs opening/closing brackets.

Alex Turpin Over a year ago

I beg to differ. JSON.stringify([1, 2, 3]);

gen_Eric Over a year ago

JSON.stringify([1, 2, 3]) = '[1,2,3]'. As you can see it has [ and ] around it. Those are opening/closing brackets.

Alex Turpin Over a year ago

Right. We have a different word for them in french, got me confused. You're right.

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