Restful filter

This library aim to convert querystring parameters into parsed json with related operators, so you would able to use the parsed values into another query action like filtering by using your model on SQL library (knex, sequelize, etc).

Features

• Filter querystring parameters
• Parse pagination by using page and count parameter
• Parse ordering by using order parameter

Installation

# via npm
npm i restful-filter --save

# via yarn
yarn add rest

Usage

const restfulFilter = require('restful-filter')

const filter = restfulFilter({ 
    case_sensitive: false // false by default, this is just example
})

# FILTER
# /api/users?name__ilike=aditya&age__eq=25&password__ilike=%a%
.get('/users', (req, res, next) => {
  const queryParams = req.query
  const allowedColumn = ['name', 'age']
  const searchParams = filter.parse(queryParams, allowedColumn).filter

  # now searchParams contains
  # {
  #   name: {operator: '$iLike', operatorSQL: 'ILIKE', column: 'name', value: 'aditya'},
  #   age: {operator: '$eq', operatorSQL: '=', column: 'age', value: '25'}
  # }
  #
  # password filter will not processed because not listed in the allowedColumn
})

# PAGINATION
# /api/users?page=2
.get('/users', (req, res, next) => {
    const queryParams = req.query
    const paginationParams = filter.parse(queryParams).paginate

    # paginationParams contains
    # {
    #   offset: 20,
    #   limit: 20   
    # }
})

# ORDER
# api/users?order_by=-id,name
.get('/users', (req, res, next) => {
    const queryParams = req.query
    const orderParams = filter.parse(queryParams).order

    # orderParams contains
    # [
    #   ['id', 'DESC']
    #   ['name', 'ASC']
    # ]

    # You even can limit the order column value by using second parameter as allowedColumn to process
    # Like 
    
    const orderParams = filter.parse(queryParams, ['id']).order

    # Would return
    # [
    #   ['id', 'DESC']
    # ]
})

Configuration

Key	Default Value	Description
case_sensitive	false	Use case sensitive on query string parameter and parameter value
page_param_name	page	Page parameter name to be used on querystring
limit_param_name	count	Limit parameter name to be used on querystring
per_page	20	Default number count per request if not set
max_count_per_page	100	Maximum count for per_page parameter, so for example if count parameter value is higher than 100, the return value would stick to 100
order_param_name	order_by	Order parameter name to be used on querystring

Operators

Operator	Description	Example
__eq	Find column equal with value	?name__eq=smith
__not	Not same with given value	?active__not=true
__ne	Negation, the opposite of equal	?name__ne=smith
__lt	Lower than	?age__lt=10
__gt	Greater than	?age__gt=15
__lte	Lower than and equal	?age__lte=25
__gte	Greater than and equal	?age__gte=20
__like	Like with case sensitive	?name__like=smith
__ilike	Like with case insensitive (Postgres)	?name__ilike=smith
__notLike	Opposite of like with case sensitive	?name__notLike=smith
__notILike	Opposite of like with case insensitive (Postgres)	?name__notILike=smith
__in	Find value which listed on given list	?city__in=jakarta,bandung,bekasi
__notIn	Find value which not listed in given list	?city__notIn=bogor,depok,tangerang
__contains	Find value that contains in given list (Postgres)	?name__contains=smith
__between	Find value which between 2 given values	?date__between=2015-06-18,2017-05-31
__notBetween	Find value which is not between 2 given values	?date__notBetween=2015-06-18,2017-05-31

Test

npm run test

Note

Please open a pull request for further abilities and another issues

License

MIT