Fetching Data

An example of how to fetch data from an API, manipulate that data, and then write the data to a JSON file.

There are two main files here

• index.js that fetches data using axios and then uses the file system module to write the response to a JSON file. The JSON file is called data_from_api.json
• createGraph.js takes the JSON file and creates connections between the farms based on distance between lat and lon points and then writes another JSON file with this data called farm_graph.json

data is fetched from this url: "https://data.ct.gov/resource/y6p2-px98.json?category=Fruit&item=Peaches"

(I know this is kind of random it's a list of peach farms in Conetticut but I saw each farm had lat and lon coordinate points which I used to make connections between each farm)

I use the geodist library to determine distance between farms

use is like this

const geodist = require('geodist')

const dist = geodist({lat: 41.85, lon: -87.65}, {lat: 33.7489, lon: -84.3881})
console.log(dist)           
// => 587

graph looks like this

{
  // each farm is a vertex
  "Farm Number One": {
    phone: "123-456-7890",
    // array of farms that are within 5 miles
    // this is creating edges between farms
    closeFarms: [
      "Farm Number Three",
      "Farm Number Five",
      "Farm Number Ten"
    ]
  },
    "Farm Number Two": {
    phone: "102-345-6789",
    closeFarms: [
      "Farm Number Six",
      "Farm Number Five",
      "Farm Number Thirteen",
      "Farm Number Four"
    ]
  }
}