From JSON object compare key value to value in another JSON object and create new object grouped by value

I have a JSON blob (JSON_1) but many more entries. Note the Tag key value.... I have another JSON_2 blob with categories matching the Tag in JSON_1 see further down. Your job is to write a javascript function, which will take in JSON_1 and JSON_2 and output a new JSON blob with the format seen at the end of this description JSON_1 Mixed objects [{ "Categories": null, "IsPremium": "no", "Name": "Imgur", "Description": "The page contains content from image sharing website imgur.", "Link": "http:\/\/[login to view URL]", "Tag": "widgets", "FirstDetected": 1382655600000, "LastDetected": 1418079600000 }, { "Categories": ["Data Management Platform"], "IsPremium": "no", "Name": "Fastly", "Description": "Real-time Analytics and CDN platform. Analyze your web and server traffic patterns in real-time.", "Link": "http:\/\/[login to view URL]", "Tag": "analytics", "FirstDetected": 1380841200000, "LastDetected": 1509145200000 }, { "Categories": ["Ad Network", "Audience Targeting"], "IsPremium": "no", "Name": "Dstillery", "Description": "Building custom audiences using brand loyalists and their strongest online connections. Previously known as Media6Degrees.", "Link": "http:\/\/[login to view URL]", "Tag": "ads", "FirstDetected": 1380841200000, "LastDetected": 1485990000000 }, { "Categories": ["Conversion Optimization"], "IsPremium": "no", "Name": "Twitter Analytics", "Description": "A tool that helps website owners understand how much traffic they receive from Twitter and the effectiveness of Twitter integrations on their sites. Includes Twitter Conversion Tracking.", "Link": "https:\/\/[login to view URL]\/blog\/introducing-twitter-web-analytics", "Tag": "analytics", "FirstDetected": 1380236400000, "LastDetected": 1504393200000 }.....] JSON_2 (categories) [ { "Id": "ads", "Name": "Advertising", }, { "Id": "widgets", "Name": "Widgets", }, { "Id": "analytics", "Name": "Analytics and Tracking", }...] Output [ { "Tag":"ads", "results": [ ... all matching objects from JSON_1 where Tag == "ads" ], } ]