With:
var obj = { "object[foo][bar][ya]": 100 };
How can I create:
var obj = { object: { foo: { bar: { ya: 100 }}}};
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4 Answers
Manual approach
Split the given string with bracket, then iterate through the resultant tokens to make the nested object:
Given
var obj = { "object[foo][bar][ya]": 100 };
Split them so we get
var tokens = Object.keys(obj)[0]
.split('[')
.map(function(s){return s.replace(']','')});
// tokens = [ 'object', 'foo', 'bar', 'ya' ]
Then make the nested object, inside out
var result = {};
tokens.reverse().forEach(function(key){
if (Object.keys(result).length==0){
result[key] = obj[Object.keys(obj)[0]]; // inner-most key-value
}
else{
var temp = {};
temp[key] = result;
result = temp;
}
});
Result
{"object":{"foo":{"bar":{"ya":100}}}}
Their is no native things in javascript fr parsing nested object in querystring.
You can use http://medialize.github.io/URI.js/ which is pretty damn good at the job.
console.log(URI.parseQuery("?&foo=bar&&foo=bar&foo=baz&"));
If you don't want to import the full library, this is just the part for querystring parsing (full credit to https://github.com/medialize/URI.js):
var URI = {
decodeQuery: function(string, escapeQuerySpace) {
string += '';
try {
return decodeURIComponent(escapeQuerySpace ? string.replace(/\+/g, '%20') : string);
} catch(e) {
// we're not going to mess with weird encodings,
// give up and return the undecoded original string
// see https://github.com/medialize/URI.js/issues/87
// see https://github.com/medialize/URI.js/issues/92
return string;
}
},
parseQuery: function(string, escapeQuerySpace) {
if (!string) {
return {};
}
// throw out the funky business - "?"[name"="value"&"]+
string = string.replace(/&+/g, '&').replace(/^\?*&*|&+$/g, '');
if (!string) {
return {};
}
var items = {};
var splits = string.split('&');
var length = splits.length;
var v, name, value;
for (var i = 0; i < length; i++) {
v = splits[i].split('=');
name = URI.decodeQuery(v.shift(), escapeQuerySpace);
// no "=" is null according to http://dvcs.w3.org/hg/url/raw-file/tip/Overview.html#collect-url-parameters
value = v.length ? URI.decodeQuery(v.join('='), escapeQuerySpace) : null;
if (Object.prototype.hasOwnProperty.call(items, name)) {
if (typeof items[name] === 'string') {
items[name] = [items[name]];
}
items[name].push(value);
} else {
items[name] = value;
}
}
return items;
}
};
Comments
You could get the parts and build a new object.
const obj = {
"object[foo][bar][ya]": 100,
"object[foo][baz]": 200,
"object[foo][bar][bar]": 50,
"xy": 30
};
let newObj = {};
for (const i in obj) {
let a = i.match(/([^\[\]]+)(\[[^\[\]]+[^\]])*?/g),
p = obj[i];
j = a.length;
while (j--) {
q = {};
q[a[j]] = p;
p = q;
}
// merge object
let k = Object.keys(p)[0],
o = newObj;
while (k in o) {
p = p[k];
o = o[k];
k = Object.keys(p)[0];
}
o[k] = p[k];
}
console.log(newObj);.as-console-wrapper { max-height: 100% !important; top: 0; }
Comments
Here's an es6 version. Caution: Hasn't been tested for edge cases.
const keyPattern = /^(\w+)\[(\w+)\](.*)$/;
export function decodeParams(params) {
return Object.keys(params).reduce((result, key) => {
let match = key.match(keyPattern);
if (match && match.length >= 3) {
let [key, nextKey, rest = ''] = match.slice(1);
result[key] = Object.assign(
{},
result[key],
decodeParams({ [nextKey + rest]: params[key] })
);
} else {
result[key] = params[key];
}
return result;
}, {});
}
