Using nodejs, need to read a json file and get the count by ignoring the duplicate values

Job ID: 31202976

Budget: ₹600 – ₹1,500 INR

I have a json file, Need to read the data, and get the count of data. If any duplicate data is present, need to ignore the first occurrence of duplicate data
Related categories: JavaScript Python NoSQL Couch & Mongo Node.js AngularJS