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// using geometry to calculate distance between to points by latitude and longitude,
//units are of type enum, 'M' for distance in miles, 'K' for distance in kilometers or 'N' in Nautic Miles 

module.exports.calculateDistance = (a, b, unit = 'M') => {
    //if points received are not valid
    if (!a || !b || !a.lat || !a.lon || !b.lat || !b.lon) {
        return 0
    }
    let lat1 = a.lat;
    let lon1 = a.lon;

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const getDistance=({lat, lon, query,sortOptions={distance:-1} })=>{
    
  // implementation of the distance calculation using mongodb aggregate pipeline
  //assuming there's a field called businessInfo and it's an object like {location:{lon:value, lat:value}}
    let radlat1 = { $divide: [{ $multiply: [3.141592653589793238, lat] }, 180] };
    let radlat2 = { $divide: [{ $multiply: [3.141592653589793238, "$businessInfo.location.lat"] }, 180] };
    let theta = { $subtract: [lon, "$businessInfo.location.lon"] }; 
    let radtheta = { $divide: [{ $multiply: [3.141592653589793238, theta] }, 180] };
    let dist = { $sum: [{ $multiply: [{ $sin: radlat1 }, { $sin: radlat2 }] }, { $multiply: [{ $cos: radlat1 }, { $cos: radlat2 }, { $cos: radtheta }] }] };
    dist = { $acos: dist };

buddyeorl

//file path related imports
const path = require('path');
const fs = require('fs');
const util = require('util');

//read file
const readline = require('readline');

let zipCodes = {}

buddyeorl

//express server import
const express = require('express');

//body parser
const bodyParser = require('body-parser');

//CORS
var cors = require('cors')

//initialize express server app

buddyeorl

// importing zipCode data file
let zipCodes = require('./allZipCodesFilesWithCityNamesShort').allZipCodesFilesWithCityNamesShort;

// importing calculate distance functions
const calculateDistance = require('./calculateDistance').calculateDistance;

module.exports.getRadius = (zipCode, limit, unit = 'M') => {
    let results = [];

    //check if received Zip Code exist in the zipCodes object

buddyeorl

Install

npm i zipcode-city-distance

Usage

const zipCodeData = require('zipcode-city-distance');

buddyeorl

const fs = require('fs');
const util = require('util');
const axios = require('axios');
const cheerio = require('cheerio');
const url = ""; // <- i set the url to crawl here


const fetchData= async (url)=> {
    await new Promise(resolve => { 
      //randomize crawling times

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//express server import
const express = require('express');

//body parser
const bodyParser = require('body-parser');

//CORS
var cors = require('cors')

//initialize express server app

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const express = require('express');
const router = express.Router();
const bodyParser = require('body-parser');
router.use(bodyParser.urlencoded({ extended: true }));
router.use(bodyParser.json());

//middleware
const equipmentLookup = require('../helper/equipmentData/equipmentLookup');

router.get('/', equipmentLookup, (req, res) => {

buddyeorl

//importing data, if it's host locally, otherwise handle the db imports here
const data = require('./data');


//this function will show exact results as default and then partial results if no exact results were found 
module.exports = (req, res, next) => {
    //default value
    let queries = ['one', 'two', 'three']
    if (req.query && req.query.search && typeof req.query.search === 'object') {
        queries = req.query.search