Parsing JSON - json array of arrays

JSON.parse is only not throwing an error for JSON.parse(500) because you can use it on a number. You already have a json object (otherwise your line JSON.parse(json.list[0]['weather'][0].id); would fail too).

The output of JSON.parse(500) is 500:

console.log(JSON.parse(500))

However, when you try to JSON.parse non json, you get an error:

console.log(JSON.parse("foo"))

That being said, you don't need JSON.parse at all, as it is only for, well ,parsing JSON. To get what you want, just use

console.log(json.list[0].weather[0].description);

If you're just trying to access the value of that property, there is on need for JSON.parse. It doesn't make sense to call JSON.parse on a property value to begin with...unless that value is a string interpretation of more JSON data.

A simple: json.list[0].weather[0].description should return the string value that you want.

You need to parse the string first with JSON.parse and then access the data with the properties.

var json = '{ "cod": "200", "message": 0.0085, "cnt": 37, "list": [{ "dt": 1492074000, "main": { "temp": 8.74, "temp_min": 8.39, "temp_max": 8.74, "pressure": 1002.4, "sea_level": 1023.01, "grnd_level": 1002.4, "humidity": 94, "temp_kf": 0.35 }, "weather": [{ "id": 500, "main": "Rain", "description": "Lekki deszcz", "icon": "10d" }], "clouds": { "all": 32 } }] }',
    object = JSON.parse(json);

console.log(object.list[0]['weather'][0].description);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Close the call to the parsing function (JSON.parse(json)) before you start accessing the internals of the parsed object. Otherwise, you are trying to access properties like 'list' on your json string instead of on the json data structure.

var json = `{
  "cod": "200",
  "message": 0.0085,
  "cnt": 37,
  "list": [{
    "dt": 1492074000,
    "main": {
      "temp": 8.74,
      "temp_min": 8.39,
      "temp_max": 8.74,
      "pressure": 1002.4,
      "sea_level": 1023.01,
      "grnd_level": 1002.4,
      "humidity": 94,
      "temp_kf": 0.35
    },
    "weather": [{
      "id": 500,
      "main": "Rain",
      "description": "Lekki deszcz",
      "icon": "10d"
    }],
    "clouds": {
      "all": 32
    }
  }]
}`

console.log(
  JSON.parse(json).list[0]['weather'][0].description
)