Deduplicate Associated Array in JS

deduplicate.js

var parsedData = [];
/*KP: In parsedData we have a key called PsId */

/* KP: Deduplicate */
parsedData.forEach(function(value, key) {
  var seen = [];            
  for (i=0; i < value.length; i++){
    if (seen[value[i].PsId]) {  
      value.splice(i,1); 
      i--;  }
    else {  seen[value[i].PsId]=true;  }
  }                        
});