Getting the specific information you need from a JSON object in Angular 2

Struggling to extract specific data from a JSON file with nested objects like this:

{
"results" : [
  {
     "address_components" : [
        {
           "long_name" : "277",
           "short_name" : "277",
           "types" : [ "street_number" ]
        },
        {
           "long_name" : "Bedford Avenue",
           "short_name" : "Bedford Ave",
           "types" : [ "route" ]
        },
        {
           "long_name": "Williamsburg", 
           "short_name": "Williamsburg",
           "types": ["neighborhood", "political"]
        },
        ...
     ],
     ...
  }
  ], 
  "status" : "OK"
}

Only interested in the city name. Is there a way to filter and access just that piece of information?

Attempted to retrieve it using:

Object.keys(JSON[0]);

Answer №1

If you want to filter by the sublocality_level_1 and create a reusable function for handling JSON data that may be sorted differently, you can use the following code snippet:

const getCity = data => data.address_components
      .filter(x => x.types && x.types.indexOf("sublocality_level_1") > -1)
      .map(x => x.long_name)[0];

// Obtain the city name from the first result only 
const oneCity = getCity(jsonData.results[0]);

// Create an array containing all city names (across all results)
const allCities = jsonData.results.map(getCity);

Answer №2

When working with your specific dataset

>> data['results'][0]['address_components'][2]['long_name']
Williamsburg

>> data['results'][0]['address_components'][3]['long_name']
Brooklyn

If the data is in JSON format, it must be converted to JavaScript objects first

data = JSON.parse(the_json_string_here);

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