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# Query String
Stability: 2 - Stable
<!--name=querystring-->
This module provides utilities for dealing with query strings.
It provides the following methods:
## querystring.escape
The escape function used by `querystring.stringify`,
provided so that it could be overridden if necessary.
## querystring.parse(str[, sep][, eq][, options])
Deserialize a query string to an object.
Optionally override the default separator (`'&'`) and assignment (`'='`)
characters.
Options object may contain `maxKeys` property (equal to 1000 by default), it'll
be used to limit processed keys. Set it to 0 to remove key count limitation.
Options object may contain `decodeURIComponent` property (`querystring.unescape` by default),
it can be used to decode a `non-utf8` encoding string if necessary.
Example:
```js
querystring.parse('foo=bar&baz=qux&baz=quux&corge')
// returns { foo: 'bar', baz: ['qux', 'quux'], corge: '' }
// Suppose gbkDecodeURIComponent function already exists,
// it can decode `gbk` encoding string
querystring.parse('w=%D6%D0%CE%C4&foo=bar', null, null,
{ decodeURIComponent: gbkDecodeURIComponent })
// returns { w: '中文', foo: 'bar' }
```
## querystring.stringify(obj[, sep][, eq][, options])
Serialize an object to a query string.
Optionally override the default separator (`'&'`) and assignment (`'='`)
characters.
Options object may contain `encodeURIComponent` property (`querystring.escape` by default),
it can be used to encode string with `non-utf8` encoding if necessary.
Example:
```js
querystring.stringify({ foo: 'bar', baz: ['qux', 'quux'], corge: '' })
// returns 'foo=bar&baz=qux&baz=quux&corge='
querystring.stringify({foo: 'bar', baz: 'qux'}, ';', ':')
// returns 'foo:bar;baz:qux'
// Suppose gbkEncodeURIComponent function already exists,
// it can encode string with `gbk` encoding
querystring.stringify({ w: '中文', foo: 'bar' }, null, null,
{ encodeURIComponent: gbkEncodeURIComponent })
// returns 'w=%D6%D0%CE%C4&foo=bar'
```
## querystring.unescape
The unescape function used by `querystring.parse`,
provided so that it could be overridden if necessary.
It will try to use `decodeURIComponent` in the first place,
but if that fails it falls back to a safer equivalent that
doesn't throw on malformed URLs.
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