"用 JSON 中的引号替换 null"

Question

This topic is addressed on this site for PHP and Rails but I don't see anything for standard JavaScript.

{"id":"e6168d55-1974-e411-80e0-005056971214","label":"List","parentId":null}

Answer 1

JSON.stringify accepts a replacer callback that allows you to substitute values with other values. The replacer callback runs for every key-value pair processed in the input, and it replaces the supplied value with it return value.

Simply have your replacer callback look for any null values and replace them with the empty string:

var myObj = {
               "id":"e6168d55-1974-e411-80e0-005056971214",
               "label":"List",
               "parentId":null
             };

JSON.stringify(myObj, function(key, value) {
    // if value is null, return "" as a replacement
    if(value === null) {
        return "";
    }

    // otherwise, leave the value unchanged
    return value;
});

If you don't have an object, but only have JSON as input, you can build an object using var myObj = JSON.parse(jsonInput);

Answer 2

Not sure why you're mentioning single quotes, but in json it would never look like this:

id:null

Perhaps you meant this?

{
  "id": null
}

Regardless, if you want to encode "" instead of null , you provide an empty string, because "" is simply how you encode an empty string. So go through your null s and replace them with empty strings.

Answer 3

I do not believe there is a quick and easy way to map NULL to "". If you are not working with a very deep JSON structure then you can iterate through the structure and change it from NULL to "".

Answer 4

这解决了我的问题

  myJSON = myJSON.replace(/null/i, "\"\"");

Answer 5

Try this.

var response = yourResponseText.replace(/null/g, '')
var json = JSON.parse(response);

Replace null in your response text with '' . After replacing, parse response string to JSON .

Answer 6

Try this

const obj = {
    "id": "e6168d55-1974-e411-80e0-005056971214",
    "label": "List",
    "parentId": null
}

const jsonObj = JSON.stringify(obj,
    (key, value) => (value === null) ? '' : value
);

console.log(jsonObj);
// return -> {"id":"e6168d55-1974-e411-80e0-005056971214","label":"List","parentId":""}

Answer 7

{"id":"e6168d55-1974-e411-80e0-005056971214","label":"List","parentId": "parentId" ? "parentId" : ''}