AQS is a query parser library that provides advanced operations comparing to typical query parser libraries. For example, you can use different operators additional to =, or parse values from string to whatever you want and even define complex logic instead of just using and operator for parameters!

Installation

npm install aqs

Usage

Basic

const { parse } = require('aqs');

const parsed = parse('id=3&age=22');

Use other operators

const { parse } = require('aqs');

const parsed = parse('id=3&age{gt}22'); // Greater than

Use negative operators

You can add n prefix to operator names or not_ to full name of operators to make them negative.

const { parse } = require('aqs');

const parsed = parse('id=3&age{ne}22'); // Not equal

Use with config

const { parse } = require('aqs');

const parsed = parse('id=3&age=22', { paramsConfigs: { age: { defaultValue: 20 } } });

Use with custom logic

You can define logic of parameters in logic query string, using parentheses with and and or operators.

Benefit of this feature is that you can allow client side that makes more complex queries instead of simple equal queries.

const { parse } = require('aqs');

const parsed = parse('skill=coding&age=30&experience=8&logic=(and,skill,(or,age,experience))');   // skill==coding and (age==30 or experience==8)

Other features

There are some other features such as defining custom operators, parse values, ... that you can find them in examples folder.

List of operators

Operator	Full-name
e	equal
i	in
sw	startsWith
ew	endsWith
gt	greaterThan
lt	lessThan
ge	greaterOrEqual
le	lessOrEqual
b	between
c	contains
ic	includes
l	like
il	ilike
r	regex

Configurations

	Option	Description	Default value
paramsConfigs (Configs that can be set for each parameter)	defaultValue	Default value of specific param
	defaultOptions	Set default operator for specific param
	parser	Use a parser to parse value
	allowUnParseAble	If true, throws error if value is not parsable with the parser, Otherwise unparsed value will be used	false
	alias	Use another key instead of passed key
	allowedOps	List of allowed operators to be used	all
	mapOp	If false, short name of operator will be returned, Otherwise fullname of operator will be returned	true
globalConfigs (Configs that will be applied on all parameters)	allowedParams	List of parameters that could be passed in query string	all
	excludedParams	List of parameters that could not be passed in query string
	parseArrays	Parse array values or not	true
	parseJsons	Parse json values or not	true
	throwOnIllegalOp	If true, throws error if an unknown operator passed	false
	allowLogic	Allow logic in query string or not	true
	throwWrongLogic	Throw error if incorrect logic passed	false
fixedParams (List of parameters that always will be returned)	name	Name of parameter
	value	Value of parameter
	op	Operator of parameter
	not	Negate operator or not