JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://underscorejs.org/underscore-min.js"></script>

CSS

body {
    white-space: pre;
    font-family: monospace;
}

JavaScript

var data1=[{"year":2000,"country":"Madagascar","country_id":847,"group":"Economic Statistics "}, {"year":2005,"country":"Madagascar","country_id":847,"group":"Economic Statistics "}, {"year":2000,"country":"Madagascar","country_id":847,"group":"Economic Statistics "}, {"year":2005,"country":"Libya","country_id":846,"group":"Demographic and Social Statistics "}, {"year":2008,"country":"Libya","country_id":846,"group":"Demographic and Social Statistics "}, {"year":2005,"country":"Libya","country_id":846,"group":"Demographic and Social Statistics "}]

///

data1=_.uniq(data1, function(x){
    return JSON.stringify([x.year, x.country_id])
});
alert(JSON.stringify(da))
///

document.body.innerText = JSON.stringify(data1, true, " ")