Join 2 JSON objects on common property in JavaScript

join.js

$.when(
	$.getJSON('https://data.phila.gov/resource/bbgf-pidf.geojson'),
	$.getJSON('https://data.phila.gov/resource/r24g-zx3n.json?%24select=count(*)%20as%20value%2C%20%3A%40computed_region_bbgf_pidf%20as%20label&%24group=%3A%40computed_region_bbgf_pidf&%24order=value%20desc')
).done(function(responseGeojson, responseData) {
	var data = responseData[0]
	var geojson = responseGeojson[0]
	
	// Create hash table for easy reference
	var dataHash = {}
	data.forEach(function(item) {
		if(item.label) dataHash[item.label] = item.value
	})
	
	// Add value from hash table to geojson properties
	geojson.features.forEach(function(item) {
		item.properties.incidents = +dataHash[item.properties._feature_id] || null 
	})
	
	console.log(geojson)
})