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javascript - How to convert an x-www-form-urlencoded string to JSON?

问题描述:

Exampple of application/x-www-form-urlencoded string

CorrelationId=1&PickedNumbers%5B%5D=1&PickedNumbers%5B%5D=2&PickedNumbers%5B%5D=3&PickedNumbers%5B%5D=4

Into JSON

var gamePlayData = {

CorrelationId: gameId,

PickedNumbers: ["1","2","3","4"]

};

网友答案:

I've been dealing with this recently: I had to parse data that could contain objects nested up to 5 levels deep. I needed the code to be able to deal with both rather complex data, but not fail to decode a URI as simple as id=213.

I spent quite some time on google, trying to find a (semi-)elegant solution to this problem, and this question kept showing up. Since it gets 1 view/day (give or take) I've decided to post my solution here, hope it helps someone out:

function form2Json(str)
{
    "use strict";
    var obj,i,pt,keys,j,ev;
    if (typeof form2Json.br !== 'function')
    {
        form2Json.br = function(repl)
        {
            if (repl.indexOf(']') !== -1)
            {
                return repl.replace(/\](.+?)(,|$)/g,function($1,$2,$3)
                {
                    return form2Json.br($2+'}'+$3);
                });
            }
            return repl;
        };
    }
    str = '{"'+(str.indexOf('%') !== -1 ? decodeURI(str) : str)+'"}';
    obj = str.replace(/\=/g,'":"').replace(/&/g,'","').replace(/\[/g,'":{"');
    obj = JSON.parse(obj.replace(/\](.+?)(,|$)/g,function($1,$2,$3){ return form2Json.br($2+'}'+$3);}));
    pt = ('&'+str).replace(/(\[|\]|\=)/g,'"$1"').replace(/\]"+/g,']').replace(/&([^\[\=]+?)(\[|\=)/g,'"&["$1]$2');
    pt = (pt + '"').replace(/^"&/,'').split('&');
    for (i=0;i<pt.length;i++)
    {
        ev = obj;
        keys = pt[i].match(/(?!:(\["))([^"]+?)(?=("\]))/g);
        for (j=0;j<keys.length;j++)
        {
            if (!ev.hasOwnProperty(keys[j]))
            {
                if (keys.length > (j + 1))
                {
                    ev[keys[j]] = {};
                }
                else
                {
                    ev[keys[j]] = pt[i].split('=')[1].replace(/"/g,'');
                    break;
                }
            }
            ev = ev[keys[j]];
        }
    }
    return obj;
}

I've tested it, with data like the string below (4 levels deep):

str  = "id=007&name[first]=james&name[last]=bond&name[title]=agent&personalia[occupation]=spy&personalia[strength]=women&personalia[weakness]=women&tools[weapons][close][silent]=garrot&tools[weapons][medium][silent]=pistol_supressed&tools[weapons][medium][loud]=smg&tools[weapons][far][silent]=sniper&tools[movement][slow]=foot&tools[movement][far]=DBS";

Which neatly returns an object, that, when passed through JSON.stringify comes out like this:

{"id":"007","name":{"title":"agent","first":"james","last":"bond"},"personalia":{"weakness":"women","occupation":"spy","strength":"women"},"tools":{"movement":{"far":"DBS","slow":"foot"},"weapons":{"close":{"silent":"garrot"},"medium":{"silent":"pistol_supressed","loud":"smg"},"far":{"silent":"sniper"}}}}

It passes a JSlint check, when ignoring white space, . and [^...] and accepting ++. All in all, I'd consider that to be acceptable.

网友答案:

You can use qs if you're using node, or browserify.

var qs = require('qs')
var encodedString = "CorrelationId=1&PickedNumbers%5B%5D=1&PickedNumbers%5B%5D=2&PickedNumbers%5B%5D=3&PickedNumbers%5B%5D=4" 

console.log(qs.parse(encodedString))
// { CorrelationId: '1', PickedNumbers: [ '1', '2', '3', '4' ] }
网友答案:

the following code should do the trick:

var str = 'CorrelationId=1&PickedNumbers%5B%5D=1&PickedNumbers%5B%5D=2&PickedNumbers%5B%5D=3&PickedNumbers%5B%5D=4';
var keyValuePairs = str.split('&');
var json = {};
for(var i=0,len = keyValuePairs.length,tmp,key,value;i <len;i++) {
    tmp = keyValuePairs[i].split('=');
    key = decodeURIComponent(tmp[0]);
    value = decodeURIComponent(tmp[1]);
    if(key.search(/\[\]$/) != -1) {
        tmp = key.replace(/\[\]$/,'');
        json[tmp] = json[tmp] || [];
        json[tmp].push(value);
    }
    else {
        json[key] = value;
    }
}
网友答案:

Try this->

// convert string to object
str = 'a=6&id=99';
var arr = str.split('&');
var obj = {};
for(var i = 0; i < arr.length; i++) {
    var bits = arr[i].split('=');
    obj[bits[0]] = bits[1];
}
//alert(obj.a);
//alert(obj.id);

// convert object back to string
str = '';
for(key in obj) {
    str += key + '=' + obj[key] + '&';
}
str = str.slice(0, str.length - 1); 
alert(str);

Or use this (JQuery) http://api.jquery.com/jQuery.param/

网友答案:

Here's a pure-JavaScript way to do it. JavaScript frameworks might also help you out with this. EDIT: Just for kicks, I threw in dictionary parsing, too. See the 2nd example.

function decodeFormParams(params) {
  var pairs = params.split('&'),
      result = {};

  for (var i = 0; i < pairs.length; i++) {
    var pair = pairs[i].split('='),
        key = decodeURIComponent(pair[0]),
        value = decodeURIComponent(pair[1]),
        isArray = /\[\]$/.test(key),
        dictMatch = key.match(/^(.+)\[([^\]]+)\]$/);

    if (dictMatch) {
      key = dictMatch[1];
      var subkey = dictMatch[2];

      result[key] = result[key] || {};
      result[key][subkey] = value;
    } else if (isArray) {
      key = key.substring(0, key.length-2);
      result[key] = result[key] || [];
      result[key].push(value);
    } else {
      result[key] = value;
    }
  }

  return result;
}

decodeFormParams("CorrelationId=1&PickedNumbers%5B%5D=1&PickedNumbers%5B%5D=2&PickedNumbers%5B%5D=3&PickedNumbers%5B%5D=4");
// => {"CorrelationId":"1","PickedNumbers":["1","2","3","4"]}

decodeFormParams("a%5Bb%5D=c&a%5Bd%5D=e");
// => {"a":{"b":"c","d":"e"}}
网友答案:

You need the opposite of jQuery.param. One of the options is http://benalman.com/code/projects/jquery-bbq/examples/deparam/

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