How to delete item in JSON file

Question

Hi Im trying to delete an object in a JSON file but it isnt working. I set the value p equal to the entire item which includes the values name, date and number. When I use delete in order to delete the specific item from the json file it doesn't get deleted. I was wondering if any of you knew why. Thanks.

here is the nodejs code

app.get('/testtwilio3', function(req,res,next){

        var fs = require('fs');
      var configFile = fs.readFileSync('./Public/patients.json');
      var config = JSON.parse(configFile);
        var p = {name: req.query.name, date: req.query.date, number: req.query.number};
        var key = p;
        console.log(p);
        delete config[key];
        console.log( config);
    });

Here is the code from the controller

 $scope.deleteName = function($index){

  var patient = {
            name: $scope.patients[$index].name,
            date: $scope.patients[$index].date,
            number:$scope.patients[$index].number
        }
 $http.get('/testtwilio3', {params: {name: patient.name, number: patient.number, date: patient.date}}) // PASS THE DATA AS THE SECOND PARAMETER
    .success(
        function(success){
          alert("work");
            console.log(success)
        })
    .error(
        function(error){

            console.log("error" + error)
        });


   }

Here is the json file

[{"name":"John","date":"12/22/2016","number":"781314454"},{"name":"Joe","date":"09/15/2016","number":"7892834640"},{"name":"Mike","date":"08/25/2016","number":"6472329224"},{"name":"Mark","date":"08/06/2016","number":"7819231279"}]

Here is what the console is displaying. First line is what I want to be deleted and the lines below it is the array of items.

{ name: 'Mark', date: '08/06/2016', number: '7819231279' }

[ { name: 'John', date: '12/22/2016', number: '781314454' },
  { name: 'Nikhilesh Singh',
    date: '09/15/2016',
    number: '7892834640' },
  { name: 'Mike', date: '08/25/2016', number: '6472329224' },
  { name: 'Mark', date: '08/06/2016', number: '7819231279' } ]

This is how I want it to be where the item in the first line has been removed form the list of items

{ name: 'Mark', date: '08/06/2016', number: '7819231279' }

[ { name: 'John', date: '12/22/2016', number: '781314454' },
  { name: 'Nikhilesh Singh',
    date: '09/15/2016',
    number: '7892834640' },
  { name: 'Mike', date: '08/25/2016', number: '6472329224' } ]

score 2 · Accepted Answer · edited May 23 '17 at 12:08

2

[EDITED]

The delete operator is only for deleting a property from an object. Your config variable contains an array of objects, so delete will not do what you want at all.

You need to iterate through the config array and use something like splice to delete the array items that have the same name, date, and number values as in the request.

This related question might be helpful.

edited May 23 '17 at 12:08

Community

1
1

answered Aug 04 '16 at 23:58

cybersam

63,203
6
53
76

Please provide in your question: the contents of `./Public/patients.json`, what you are actually getting back in your console log, and what you are expecting the result to look like. Without that info, I had to make a lot of guesses. as to what you are trying to do. – cybersam Aug 05 '16 at 00:14

score 1 · Answer 2 · answered Aug 04 '16 at 23:55

1

You can only delete a single attribute with delete (e.g. delete <attrName>). If you want to delete multiple attributes you can use lodash's omit for example.

Hope this helps.

answered Aug 04 '16 at 23:55

Vincent Schöttke

4,416
2
12
12

How to delete item in JSON file

2 Answers2

Linked