A simple and lightweight QueryString library by TypeScript for node.js or browsers.

Installation is done using the npm install command:

npm install -S @billjs/query-string

• parse
• stringify

Parse the string to an object. Support the parsing of multiple keys with the same name, and parse them into arrays. The parsed keys and values are decoded by decodeURIComponent function. If you specified the fn argument, that means you can to use it for customize value.

• str (string) source string
• [sep] (string | null optional) group separator, default &
• [eq] (string | null optional) key-value separator, default =
• [fn] (ParseFunction) a function, it can be used to customize return values.
• return (object)

Parse a normal query-string.

const data = parse('a=1&b=s');
console.log(data); // ==> { a: '1', b: 's' }

Parse the search from URL.

const data = parse('http://foo.com?a=1&b=s');
console.log(data); // ==> { a: '1', b: 's' }

Parse it when if key or value is encoded.

const data = parse('test%3D=test%20%26*%20test');
console.log(data); // ==> { 'test=': 'test &* test' }

Parse it when if sep and eq are specified.

const data = parse('a#1|b#s|b#s2', '|', '#');
console.log(data); // ==> { a: '1', b: ['s', 's2'] }

Parse the same name key as an array.

const data = parse('a=1&b=s1&b=s2');
console.log(data); // ==> { a: '1', b: ['s1', 's2'] }

Parse it for customize value.

const fn = (key: string, value: string) => {
  if (key === 'b') return +value;
  if (key === 'c') return { on: true, off: false }[value];
  return value;
};
const data = parse('a=test&b=1&c=on', null, null, fn);
console.log(data); // ==> { a: 'test', b: 1, c: true }

Stringify the object to a string. Support the stringifying of arrays into keys of the same name. The stringified keys and values are encoded by encodeURIComponent function. If you specified the fn argument, that means you can to use it for customize value.

• obj (object) source object
• [sep] (string | null optional) group separator, default &
• [eq] (string | null optional) key-value separator, default =
• [fn] (StringifyFunction) a function, it can be used to customize return values.
• return (string)

Stringify an object.

const query = stringify({ a: '1', b: 's' });
console.log(query); // ==> 'a=1&b=s'

Stringify the array to same name key.

const query = stringify({ a: '1', b: ['s1', 's2'] });
console.log(query); // ==> 'a=1&b=s1&b=s2'

Stringify the boolean value.

const query = stringify({ a: '1', b: 's', c: false });
console.log(query); // ==> 'a=1&b=s&c=false'

Stringify it when if the key or value need to encoded.

const query = stringify({ 'test=': 'test &* test' });
console.log(query); // ==> 'test%3D=test%20%26*%20test'

Stringify it when if sep and eq are specified.

const query = stringify({ a: '1', b: ['s', 's2'] }, '|', '#');
console.log(query); // ==> 'a#1|b#s|b#s2'

Stringify it for customize value.

const fn = (key, value) => {
  if (key === 'c') return value ? 'on' : 'off';
  return value;
};
const obj = { a: 'test', b: 1, c: true };
const query = stringify(obj, null, null, fn);
console.log(query); // ==> 'a=test&b=1&c=on'

A function for customize parse.

The declaration is like this:

type ParseFunction = (key: string, value: string) => any;

A function for customize stringify.

The declaration is like this:

type StringifyFunction = (key: string, value: any) => any;

MIT License