// input file dico.json output file data.json
var arr;
var fs = require('fs');
fs.readFile('dico.json',function(err,content){fs.writeFile("data.json",JSON.stringify({'word':cleanArray(JSON.parse(content).words)}),function(err){if(err){ throw err;};});})

function cleanArray(arra) {
   var i, j, len = arra.length, out = [], obj = {};
   for (i = 0; i < len; i++) {
     obj[arra[i]] = 0;
   }
   for (j in obj) {
     out.push(j);
   }
   return out;
 }