backoffice/node_modules/qs

qs

A querystring parsing and stringifying library with some added security.

Lead Maintainer: Nathan LaFreniere

The qs module was original created and maintained by TJ Holowaychuk.

Usage

var Qs = require('qs');

var obj = Qs.parse('a=c');    // { a: 'c' }
var str = Qs.stringify(obj);  // 'a=c'

Objects

qs allows you to create nested objects within your query strings, by surrounding the name of sub-keys with square brackets []. For example, the string 'foo[bar]=baz' converts to:

{
  foo: {
    bar: 'baz'
  }
}

You can also nest your objects, like 'foo[bar][baz]=foobarbaz':

{
  foo: {
    bar: {
      baz: 'foobarbaz'
    }
  }
}

By default, when nesting objects qs will only parse up to 5 children deep. This means if you attempt to parse a string like 'a[b][c][d][e][f][g][h][i]=j' your resulting object will be:

{
  a: {
    b: {
      c: {
        d: {
          e: {
            f: {
              '[g][h][i]': 'j'
            }
          }
        }
      }
    }
  }
}

This depth can be overridden by passing a depth option to Qs.parse(string, depth):

Qs.parse('a[b][c][d][e][f][g][h][i]=j', 1);
// { a: { b: { '[c][d][e][f][g][h][i]': 'j' } } }

The depth limit mitigate abuse when qs is used to parse user input, and it is recommended to keep it a reasonably small number.

Arrays

qs can also parse arrays using a similar [] notation:

Qs.parse('a[]=b&a[]=c');
// { a: ['b', 'c'] }

You may specify an index as well:

Qs.parse('a[1]=c&a[0]=b');
// { a: ['b', 'c'] }

Note that the only difference between an index in an array and a key in an object is that the value between the brackets must be a number to create an array. When creating arrays with specific indices, qs will compact a sparse array to only the existing values preserving their order:

Qs.parse('a[1]=b&a[15]=c');
// { a: ['b', 'c'] }

qs will also limit specifying indices in an array to a maximum index of 20. Any array members with an index of greater than 20 will instead be converted to an object with the index as the key:

Qs.parse('a[100]=b');
// { a: { '100': 'b' } }

If you mix notations, qs will merge the two items into an object:

Qs.parse('a[0]=b&a[b]=c');
// { a: { '0': 'b', b: 'c' } }

You can also create arrays of objects:

Qs.parse('a[][b]=c');
// { a: [{ b: 'c' }] }