1  # query-string
 2  
 3  Total downloads: ![total downloads](https://img.shields.io/npm/dt/query-string.svg)
 4  
 5  ## Bug discovered using property based testing (fast-check)
 6  
 7  **Issue detected:** enabling the `bracket` setting when exporting arrays containing null values produces an invalid output for the parser \[[more](https://github.com/sindresorhus/query-string/pull/138)\]
 8  
 9  **Code example:**
10  ```js
11  m.stringify({bar: ['a', null, 'b']}, {arrayFormat: 'bracket'}) //=> "bar[]=a&bar&bar[]=b"
12  m.parse('bar[]=a&bar&bar[]=b', {arrayFormat: 'bracket'}) //=> {bar: [null, 'b']}
13  ```
14  
15  **Fixed at:** 6.1.0
16  
17  ## Properties
18  
19  ### [A] should read correctly from stringified query params
20  
21      for any query parameters `params` and any options `options`
22      reading back what has been stringified should rebuild the original query parameters
23  
24      in other words:
25  
26      for any query parameters `params` and any options `options`
27      parse(stringify(`params`, `options`)) === `params`