remove key(s) from a json array under javascript

Question

Need to remove key(s) from a json array under javascript (jquery). Looks like my code is wong although it was working in my Chrome console. Your help is the most welcome. Jacques

function test() {
  var json = {
    "ID": "2196",
    "VERSION": "1-2022",
    "FILE": "2196.docx"
  };
  json = JSON.stringify(json)
  console.log("json " + json);

  delete json['FILE'];
  console.log("json " + json);
  return;
}

test();

You can't delete from JSON, you have to delete from the original object before stringifying, or parse the JSON, delete the key, then stringify again. — Barmar
– Barmar, Commented Feb 7, 2023 at 15:47
Well you could delete it from a string as well (with some different code), but I'd say deleting it from the object is way better and easier. — Mark Baijens
– Mark Baijens, Commented Feb 7, 2023 at 15:51

Yogi · Accepted Answer · 2023-02-07 16:13:17Z

1

JSON.stringify has an often overlooked parameter called the replacer. It can accept an array of key names to include in the json output:

 JSON.stringify(data, ["ID","VERSION"], " ");  // FILE is excluded

Snippet

Run the snippet to see the output with and without using the replacer.

let data = {
  "ID": "2196",
  "VERSION": "1-2022",
  "FILE": "2196.docx"
};

console.log("Without replacer: ",
  JSON.stringify(data, null, " ")
);

console.log("Using replacer: ",
  JSON.stringify(data, ["ID","VERSION"], " ")
);

answered Feb 7, 2023 at 16:13

Yogi

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Comments

Webdeveloper_Jelle · Accepted Answer · 2023-02-07 15:56:57Z

0

You should not stringify the object before removing the key.

function test() {
  var json = {
    "ID": "2196",
    "VERSION": "1-2022",
    "FILE": "2196.docx"
  };
  // stringify to show in console as string
  json = JSON.stringify(json)
  console.log("json " + json);

  // convert back to object so you can remove the key
  json = JSON.parse(json);
  delete json['FILE'];
  
  // stringify to show new object in console as string
  json = JSON.stringify(json);
  console.log("json " + json);
  return;
}

test();

answered Feb 7, 2023 at 15:56

Webdeveloper_Jelle

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1 Comment

Jacques tambard Over a year ago

Thanks for the explanation regarding the use of stringify. Afterwards it makes sense. Thanks to you Folks.

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