How to convert json string to json object in js

How to convert json string to json object in js: use [toJSONString()] or the global method [JSON.stringify()] to convert the JSON object into a JSON string, the code is [var last=obj. toJSONString();].

How to convert json string to json object in js:

Convert json string to json object method. During the data transmission process, json is transmitted in the form of text, that is, a string, and JS operates on JSON objects, so the conversion between JSON objects and JSON strings is key

For example:

JSON字符串:
var str1 = '{ "name": "cxh", "sex": "man" }'; 
JSON对象:
var str2 = { "name": "cxh", "sex": "man" };

1. Convert JSON string to JSON object

To use str1 above, you must use the following method to convert it into a JSON object first:

//由JSON字符串转换为JSON对象
var obj = eval('(' + str + ')');
或者
var obj = str.parseJSON(); //由JSON字符串转换为JSON对象
或者
var obj = JSON.parse(str); //由JSON字符串转换为JSON对象

Then, you can Read like this:

Alert(obj.name);
Alert(obj.sex);

Special note: If obj is originally a JSON object, then after using the eval() function to convert it (even if it is converted multiple times) it will still be a JSON object, but after using the parseJSON() function to process it, it will Something went wrong (throws a syntax exception).

2. You can use toJSONString() or the global method JSON.stringify() to convert the JSON object into a JSON string.

For example:

var last=obj.toJSONString(); //将JSON对象转化为JSON字符

or

var last=JSON.stringify(obj); //将JSON对象转化为JSON字符
alert(last);

Note:

Among the above methods, except the eval() function, which comes with js , several other methods are from the json.js package. The new version of JSON modifies the API and injects both JSON.stringify() and JSON.parse() methods into the built-in objects of Javascript. The former becomes Object.toJSONString(), and the latter becomes String. parseJSON(). If you are prompted that the toJSONString() and parseJSON() methods cannot be found, it means that your json package version is too low.

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