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How do I replace any instance of "" with null in an array of JSON strings in typescript?

September 27, 2022

I have an array of JSON that looks like this:

[
{"test":"a","test1":"1","test2":""},
{"test":"b","test1":"","test2":"hi"}
{"test":"","test1":"3","test2":""}
]

I want it to look like this if there are any JSON strings with "" values

[
{"test":"a","test1":"1","test2":null},
{"test":"b","test1":null,"test2":"hi"}
{"test":null,"test1":"3","test2":null}
]

>Solution :

Loop through the array, then loop through all the properties in each object. Test if the value is an empty string, if so replace it with null.

const data = [
  {"test":"a","test1":"1","test2":""},
  {"test":"b","test1":"","test2":"hi"},
  {"test":"","test1":"3","test2":""}
];

data.forEach(obj => {
  Object.keys(obj).forEach(key => {
    if (obj[key] === "") {
      obj[key] = null;
    }
  });
});

console.log(data);