How To Replace Old Json Object With A New One With Nodejs

How to replace old json object using NodeJS with a new updated object ? Right now when i update the json file it saves the new data with the old one. JSON : [ { 'id': 1, '

Solution 1:

My assumption base on your question is that you have multiple objects in one file. So the easy way to work around this would be to

if (operation == 'update') {
        fs.readFile("file.json", "utf8", function (err, data) {

            var jsonFileArr = [];
            jsonFileArr = JSON.parse(data); //Parse the data from JSON filevar haveId = jsonFileArr.some(function (obj){ // Checks if the POST request have the same id as JSON filereturn obj.id == POST.id;
            })

            if (haveId) {  // if truevar updateData = []; // Array with POST data
                updateData.push({
                    id: POST.id,
                    name: POST.name,
                    phone: POST.phone,
                })

                for(letArrof jsonFileArr){
                  if (Arr.id == POST.id){
                    let currentIndex = jsonFileArr.indexOf(Arr);
                    jsonFileArr.splice(currentIndex,1,updateData) //removing the old object and adding the new one
                  }
                }

                var newUsers = JSON.stringify(jsonFileArr);
                fs.writeFile("file.json", '', "utf8",function(err,res){  //Making the file emptyif(!err){
                    fs.writeFile("file.json", newUsers, "utf8",function(err,res){ //Writing the whole object backif(err)console.log(err);
                      console.info(res);
                    });
                  }else{
                    console.log(err);
                  }
                });

            }
        })
    }

I think this is better instead of using some, get the matching index and replace directly.

var jsonFileArr = JSON.parse(data); //Parse the data from JSON filevar foundId = jsonFileArr.findIndex(function (obj){ // Checks if the POST request have the same id as JSON filereturn obj.id == POST.id;
      });
      if (foundId >= 0) {
        jsonFileArr[foundId] = 
          {
                id: POST.id,
                name: POST.name,
                phone: POST.phone,
          }
      }

.... and then write back to file