TSV to JSON Conversion in JavaScript

tsv-to-json.js

//var tsv is the TSV file with headers
function tsvJSON(tsv){
 
  var lines=tsv.split("\n");
 
  var result = [];
 
  var headers=lines[0].split("\t");
 
  for(var i=1;i<lines.length;i++){
 
	  var obj = {};
	  var currentline=lines[i].split("\t");
 
	  for(var j=0;j<headers.length;j++){
		  obj[headers[j]] = currentline[j];
	  }
 
	  result.push(obj);
 
  }
  
  //return result; //JavaScript object
  return JSON.stringify(result); //JSON
}

Slightly cleaner. Replacing the first slice with shift(), which makes the second slice unnecessary.

      function tsvJSON(tsv) {
        const lines = tsv.split('\n');
        const headers = lines.shift().split('\t');
        return lines.map(line => {
          const data = line.split('\t');
          return headers.reduce((obj, nextKey, index) => {
            obj[nextKey] = data[index];
            return obj;
          }, {});
        });
      }

Not really clean (but what function with reduce in it is ;) ), but no slices, no headers variable:

function tsvJSON(tsv) {
  return tsv.split('\n')
  .map(line => line.split('\t'))
  .reduce((a, c, i, d) => {
    if (i) {
      const item = Object.fromEntries(c.map((val, j) => [d[0][j], val]))
      return a ? [...a, item] : [item]
    }
  }, [])
}