I'm not sure the best way to go about this. I want to iterate my json and find all panies that are in the US for example. This JSON might get way more plex as my app grows too, as in levels, objects, etc. I just want to know ways people are doing simple searching for filtering out subsets of data with JSON and Node.js and/or ES6 or libraries maybe such as Lodash, etc.

So for example this json, what are some ways I can search it and pull back only those panies in the USA?

[{
    "id": 0,
    "name": "Company1",
    "logoUrl": "/lib/assets/pany1-logo.png",
    "location":{
      "country": "USA",
      "state": "California",
      "city": "Napa"
    },
    "active": false
  },
  {
    "id": 1,
    "name": "Company2",
    "logoUrl": "/lib/assets/pany2-logo.png",
    "location":{
      "country": "Germany",
      "state": "",
      "city": "Berlin"
    },
    "active": false
  },
  {
    "id": 2,
    "name": "Company3",
    "logoUrl": "/lib/assets/pany3-logo.png",
    "location":{
      "country": "USA",
      "state": "Michigan",
      "city": "Detroit"
    },
    "active": false
  }]

I'm not sure the best way to go about this. I want to iterate my json and find all panies that are in the US for example. This JSON might get way more plex as my app grows too, as in levels, objects, etc. I just want to know ways people are doing simple searching for filtering out subsets of data with JSON and Node.js and/or ES6 or libraries maybe such as Lodash, etc.

So for example this json, what are some ways I can search it and pull back only those panies in the USA?

[{
    "id": 0,
    "name": "Company1",
    "logoUrl": "/lib/assets/pany1-logo.png",
    "location":{
      "country": "USA",
      "state": "California",
      "city": "Napa"
    },
    "active": false
  },
  {
    "id": 1,
    "name": "Company2",
    "logoUrl": "/lib/assets/pany2-logo.png",
    "location":{
      "country": "Germany",
      "state": "",
      "city": "Berlin"
    },
    "active": false
  },
  {
    "id": 2,
    "name": "Company3",
    "logoUrl": "/lib/assets/pany3-logo.png",
    "location":{
      "country": "USA",
      "state": "Michigan",
      "city": "Detroit"
    },
    "active": false
  }]

• javascript
• json
• node.js
• ecmascript-6

• yes I know that, but you can do node without ES6, I am simply saying use ES6 if you want for example or not, doesn't matter either way just trying to thing of ways to filter this – PositiveGuy Commented Jun 14, 2016 at 4:27
• in other words use node middleware to help filter, or use plain JS methods, or Use fancy ES6 whatever you want for ideas or suggestions on this – PositiveGuy Commented Jun 14, 2016 at 4:28

4 Answers 4

Use JavaScript native Array#filter method with ES6 arrow function

var res = data.filter(v => v.location.country === 'USA');

var data = [{
  "id": 0,
  "name": "Company1",
  "logoUrl": "/lib/assets/pany1-logo.png",
  "location": {
    "country": "USA",
    "state": "California",
    "city": "Napa"
  },
  "active": false
}, {
  "id": 1,
  "name": "Company2",
  "logoUrl": "/lib/assets/pany2-logo.png",
  "location": {
    "country": "Germany",
    "state": "",
    "city": "Berlin"
  },
  "active": false
}, {
  "id": 2,
  "name": "Company3",
  "logoUrl": "/lib/assets/pany3-logo.png",
  "location": {
    "country": "USA",
    "state": "Michigan",
    "city": "Detroit"
  },
  "active": false
}];

var res = data.filter(v => v.location.country === 'USA');

console.log(res);

You can use JavaScript's simple .filter() method to return the list of results fulfilling the filter. Say your data is in variable data

ES5

data.filter(function(item) {
  return item.location.country === 'USA';
});

ES6: In ES6 you can use arrow functions for same as

data.filter((item) => {
  return item.location.country === 'USA';
});

var data = [{
    "id": 0,
    "name": "Company1",
    "logoUrl": "/lib/assets/pany1-logo.png",
    "location":{
      "country": "USA",
      "state": "California",
      "city": "Napa"
    },
    "active": false
  },
  {
    "id": 1,
    "name": "Company2",
    "logoUrl": "/lib/assets/pany2-logo.png",
    "location":{
      "country": "Germany",
      "state": "",
      "city": "Berlin"
    },
    "active": false
  },
  {
    "id": 2,
    "name": "Company3",
    "logoUrl": "/lib/assets/pany3-logo.png",
    "location":{
      "country": "USA",
      "state": "Michigan",
      "city": "Detroit"
    },
    "active": false
  }];

var res1 = data.filter(function(item) {
  return item.location.country === 'USA';
});

const res2 = data.filter((item) => {
  return item.location.country === 'USA';
});

console.log(res1);
console.log(res2);

In lodash it will be

_.filter(data, function(item) {
  return item.location.country === 'USA';
});

You can use native filter function.

const items = [{
    "id": 0,
    "name": "Company1",
    "logoUrl": "/lib/assets/pany1-logo.png",
    "location":{
      "country": "USA",
      "state": "California",
      "city": "Napa"
    },
    "active": false
  },
  {
    "id": 1,
    "name": "Company2",
    "logoUrl": "/lib/assets/pany2-logo.png",
    "location":{
      "country": "Germany",
      "state": "",
      "city": "Berlin"
    },
    "active": false
  },
  {
    "id": 2,
    "name": "Company3",
    "logoUrl": "/lib/assets/pany3-logo.png",
    "location":{
      "country": "USA",
      "state": "Michigan",
      "city": "Detroit"
    },
    "active": false
  }]

const usItems = items.filter(v => v.location.country === 'USA')