javascript – jQuery JSON to string?

javascript – jQuery JSON to string?

Edit: You should use the json2.js library from Douglas Crockford instead of implementing the code below. It provides some extra features and better/older browser support.

Grab the json2.js file from: https://github.com/douglascrockford/JSON-js


// implement JSON.stringify serialization
JSON.stringify = JSON.stringify || function (obj) {
    var t = typeof (obj);
    if (t != object || obj === null) {
        // simple data type
        if (t == string) obj = +obj+;
        return String(obj);
    }
    else {
        // recurse array or object
        var n, v, json = [], arr = (obj && obj.constructor == Array);
        for (n in obj) {
            v = obj[n]; t = typeof(v);
            if (t == string) v = +v+;
            else if (t == object && v !== null) v = JSON.stringify(v);
            json.push((arr ?  :  + n + :) + String(v));
        }
        return (arr ? [ : {) + String(json) + (arr ? ] : });
    }
};

var tmp = {one: 1, two: 2};
JSON.stringify(tmp); // {one:1,two:2}

Code from: http://www.sitepoint.com/blogs/2009/08/19/javascript-json-serialization/

I use

$.param(jsonObj)

which gets me the string.

javascript – jQuery JSON to string?

Most browsers have a native JSON object these days, which includes parse and stringify methods. So just try JSON.stringify({}) and see if you get {}. You can even pass in parameters to filter out keys or to do pretty-printing, e.g. JSON.stringify({a:1,b:2}, null, 2) puts a newline and 2 spaces in front of each key.

JSON.stringify({a:1,b:2}, null, 2)

gives

{n  a: 1,n  b: 2n}

which prints as

{
  a: 1,
  b: 2
}

As for the messing around part of your question, use the second parameter. From http://www.javascriptkit.com/jsref/json.shtml :

The replacer parameter can either be a function or an array of
String/Numbers. It steps through each member within the JSON object to
let you decide what value each member should be changed to. As a
function it can return:

  • A number, string, or Boolean, which replaces the propertys original value with the returned one.
  • An object, which is serialized then returned. Object methods or functions are not allowed, and are removed instead.
  • Null, which causes the property to be removed.

As an array, the values defined inside it corresponds to the names of
the properties inside the JSON object that should be retained when
converted into a JSON object.

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