Decoding JSON - JavaScript - null value

My JSON data is as follows:

[
  {
    "0": "324",
    "1": "Cavill ",
    "2": "11",
    "3": "100018463",
    "4": "RAR",
    "5": "DummyX",
    "6": "DummyY",
    "7": "Moretext",
    "8": "moretext",
    "id": "lol",
    "teacher": "Specsavers ",
    "rate": "11",
    "teacherid": "100018463",
    "address": "114 Road X",
    "postcode": "WXER 21",
    "lat": "51.511871",
    "lon": "-0.112934",
    "distance": "0.023308985382378217"
  }
]

This data is stored in a variable named "hold".

I am attempting to display the "teacher" value within a div labeled output1.

The code I'm using is shown below:

obj = JSON.parse(hold);
document.getElementById("output1").innerHTML = obj[1].teacher;

However, I keep receiving an undefined result.

I've also tried changing index from 1 to 0 but encountered the same issue - still undefined.

Can you help me identify what might be causing this problem?

How can I correctly access attribute data from each node or branch of the JSON? Thank you!

Answer №1

When referencing data in your index, remember that the index starts at 0. In your specific data set, index 1 is currently displaying as undefined.

obj = JSON.parse(hold);
document.getElementById("output1").innerHTML = obj[0].teacher;
//------------------------------------------------^^^------

Answer №2

Ensure that the variable hold is in fact a valid JSON string. Also, be mindful of your json parsing method - you should access it using obj[0] since there is only one json object.

var hold = '[ { "0": "324","1": "Cavill ","2": "11", "3": "100018463", "4": "RAR", "5": "DummyX","6": "DummyY","7": "Moretext",  "8": "moretext","id": "lol","teacher": "Specsavers ", "rate": "11","teacherid": "100018463", "address": "114 Road X", "postcode": "WXER 21","lat": "51.511871","lon": "-0.112934", "distance": "0.023308985382378217" }]';
var obj = JSON.parse(hold);
document.getElementById('output1').innerHTML = obj[0].teacher;
<div id="output1"></div>

Answer №3

The numbering of an array begins with 0. Therefore, in your JSON data, obj[0] corresponds to the first element. Since there is no second element, obj[1] will return undefined.

Always refer to obj[0] rather than obj[1].

Example Code:

var data = '[{"0": "324", "1": "Cavill ",  "2": "11",  /* abbreviated for brevity */}]';

var obj = JSON.parse(data);
document.getElementById("result").innerHTML = obj[0].teacher;
<div id="result"></div>

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