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‎README.md‎

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[![License][license-image]][license-url] [![NPM Version][npm-image]][npm-url] [![NPM Downloads][downloads-image]][downloads-url] [![Travis][travis-image]][travis-url] [![Coverage][coverage-image]][coverage-url] [![Vulnerabilities][known-vulnerabilities-image]][known-vulnerabilities-url]
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# Query Strings Parser
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Middleware to transform query strings in a format that is recognized by the MongoDB, MySQL[¹](#future-features) and other databases.
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## Prerequisites
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To ensure the smooth operation of the middleware, your web application must be built using the [express.js][express] or [hapi.js][hapi] frameworks.
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## Installing
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Use the npm command to install this library into your project:
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```
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npm i --save query-strings-parser
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```
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### Usage Examples
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#### 1. Using default configurations
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```js
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const express = require('express')
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const qs = require('query-strings-parser')
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const app = express()
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app.use(qs()) // middleware query-strings-parser
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app.listen(3000, (req, res) => {
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console.log('app listening on port 3000')
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})
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app.get('/', (req, res) => {
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res.send('the query is:' + JSON.stringify(req.query))
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})
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/**
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* Request: http://localhost:3000?fields=name,age&skip=10&limit=10&sort=created_at
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* Result (req.query):
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* {
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* fields: { name: 1, age: 1 },
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* sort: { created_at: 'asc' }
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* filters: {},
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* pagination: {
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* skip: 10,
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* limit: 10
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* },
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* original: '?fields=name,age&skip=10&limit=10&sort=created_at'
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* }
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*/
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```
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#### The middleware uses the following defaults:
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```js
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options = {
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use_page: false,
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client_db: 'mongodb',
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date_field: {
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start_at: 'created_at',
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end_at: 'created_at'
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},
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default: {
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fields: {},
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sort: {},
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filters: {},
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pagination: {
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limit: Number.MAX_SAFE_INTEGER,
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skip: 0,
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page: 1
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}
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}
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}
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```
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If the options are not provided, the default values will be used for the treatment of queries strings.
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### 2. Using custom configurations:
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```js
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const express = require('express')
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const qs = require('query-strings-parser')
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const app = express()
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app.use(qs({
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use_page: true,
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client_db: 'mongodb',
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date_field: {
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start_at: 'timestamp',
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end_at: 'timestamp'
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},
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default: {
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fields: {name: 1 , age: 1, number: 1, _id: 0},
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sort: { created_at: 'desc' },
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filters: {},
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pagination: {
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page: 1,
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limit: 100
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}
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}
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}))
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/**
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* Request: http://localhost:3000?fields=name,age&age=30
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* Result (req.query):
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* {
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* fields: { name: 1, age: 1},
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* sort: { created_at: 'desc' }
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* filters: {age: 30},
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* pagination: {
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* limit: 100,
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* page: 1
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* },
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* original: '?fields=name,age&age=30'
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* }
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*/
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```
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For more details, access the [wiki](https://github.com/nutes-uepb/query-strings-parser/wiki/2.-Usage-Examples) page.
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## Supported Query Strings
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For informations and details about the supported query strings, access the [wiki](https://github.com/nutes-uepb/query-strings-parser/wiki/3.-Supported-Query-Strings) page.
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## New Features
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- Support for parser functions. For informations and details about parser functions, access the [wiki](https://github.com/nutes-uepb/query-strings-parser/wiki/4.-Parsers) page.
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## Future Features
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- ¹Support for relational databases such as MySQL, PostgreSQL and SQLite.
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Query Strings Parser
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=========================
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[![License][license-image]][license-url] [![NPM Version][npm-image]][npm-url] [![NPM Downloads][downloads-image]][npm-url] [![Travis][travis-image]][travis-url] [![Coverage][coverage-image]][coverage-url] [![Dependencies][dependencies-image]][dependencies-url] [![DependenciesDev][dependencies-dev-image]][dependencies-dev-url] [![Vulnerabilities][known-vulnerabilities-image]][known-vulnerabilities-url] [![Releases][releases-image]][releases-url] [![Contributors][contributors-image]][contributors-url] [![Issues][issues-image]][issues-url]
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Middleware to transform query strings in a format that is recognized by the MongoDB, MySQL[¹](#future-features) and other databases.
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## Prerequisites
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To ensure the smooth operation of the middleware, your web application must be built using the [express.js][express] or [hapi.js][hapi] frameworks.
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## Installing
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Use the npm command to install this library into your project:
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```
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npm i --save query-strings-parser
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```
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### Usage Examples
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#### 1. Using default configurations
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```js
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const express = require('express')
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const qs = require('query-strings-parser')
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const app = express()
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app.use(qs()) // middleware query-strings-parser
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app.listen(3000, (req, res) => {
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console.log('app listening on port 3000')
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})
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app.get('/', (req, res) => {
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res.send('the query is:' + JSON.stringify(req.query))
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})
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/**
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* Request: http://localhost:3000?fields=name,age&skip=10&limit=10&sort=created_at
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* Result (req.query):
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* {
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* fields: { name: 1, age: 1 },
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* sort: { created_at: 'asc' }
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* filters: {},
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* pagination: {
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* skip: 10,
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* limit: 10
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* },
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* original: '?fields=name,age&skip=10&limit=10&sort=created_at'
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* }
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*/
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```
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#### The middleware uses the following defaults:
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```js
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options = {
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use_page: false,
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client_db: 'mongodb',
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date_field: {
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start_at: 'created_at',
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end_at: 'created_at'
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},
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default: {
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fields: {},
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sort: {},
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filters: {},
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pagination: {
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limit: Number.MAX_SAFE_INTEGER,
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skip: 0,
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page: 1
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}
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}
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}
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```
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If the options are not provided, the default values will be used for the treatment of queries strings.
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### 2. Using custom configurations:
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```js
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const express = require('express')
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const qs = require('query-strings-parser')
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const app = express()
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app.use(qs({
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use_page: true,
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client_db: 'mongodb',
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date_field: {
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start_at: 'timestamp',
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end_at: 'timestamp'
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},
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default: {
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fields: {name: 1 , age: 1, number: 1, _id: 0},
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sort: { created_at: 'desc' },
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filters: {},
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pagination: {
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page: 1,
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limit: 100
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}
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}
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}))
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/**
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* Request: http://localhost:3000?fields=name,age&age=30
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* Result (req.query):
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* {
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* fields: { name: 1, age: 1},
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* sort: { created_at: 'desc' }
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* filters: {age: 30},
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* pagination: {
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* limit: 100,
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* page: 1
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* },
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* original: '?fields=name,age&age=30'
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* }
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*/
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```
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For more details, access the [wiki](https://github.com/nutes-uepb/query-strings-parser/wiki/2.-Usage-Examples) page.
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## Supported Query Strings
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For informations and details about the supported query strings, access the [wiki](https://github.com/nutes-uepb/query-strings-parser/wiki/3.-Supported-Query-Strings) page.
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## New Features
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- Support for parser functions. For informations and details about parser functions, access the [wiki](https://github.com/nutes-uepb/query-strings-parser/wiki/4.-Parsers) page.
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## Future Features
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- ¹Support for relational databases such as MySQL, PostgreSQL and SQLite.
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[//]: # (These are reference links used in the body of this note.)
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[build-test]: <https://travis-ci.org/nutes-uepb/query-strings-parser>
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[test-coverage]: <https://coveralls.io/github/nutes-uepb/query-strings-parser?branch=master>
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[node.js]: <https://nodejs.org>
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[npm.js]: <https://www.npmjs.com/>
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[express]: <https://expressjs.com>
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[hapi]: <https://hapijs.com/>
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[license-image]: https://img.shields.io/github/license/mashape/apistatus.svg
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[node.js]: <https://nodejs.org>
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[npm.js]: <https://www.npmjs.com/>
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[express]: <https://expressjs.com>
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[hapi]: <https://hapijs.com/>
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[license-image]: https://img.shields.io/badge/license-Apache%202-blue.svg
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[license-url]: https://github.com/nutes-uepb/query-strings-parser/blob/master/LICENSE
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[npm-image]: https://img.shields.io/npm/v/query-strings-parser.svg
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[npm-image]: https://img.shields.io/npm/v/query-strings-parser.svg?color=red&logo=npm
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[npm-url]: https://npmjs.org/package/query-strings-parser
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[downloads-image]: https://img.shields.io/npm/dt/query-strings-parser.svg
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[downloads-url]: https://npmjs.org/package/query-strings-parser
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[travis-image]: https://travis-ci.org/nutes-uepb/query-strings-parser.svg?branch=master
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[downloads-image]: https://img.shields.io/npm/dt/query-strings-parser.svg?logo=npm
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[travis-image]: https://img.shields.io/travis/nutes-uepb/query-strings-parser.svg?logo=travis
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[travis-url]: https://travis-ci.org/nutes-uepb/query-strings-parser
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[coverage-image]: https://coveralls.io/repos/github/nutes-uepb/query-strings-parser/badge.svg
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[coverage-url]: https://coveralls.io/github/nutes-uepb/query-strings-parser?branch=master
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[known-vulnerabilities-image]: https://snyk.io/test/github/nutes-uepb/query-strings-parser/badge.svg?targetFile=package.json
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[known-vulnerabilities-url]: https://snyk.io/test/github/nutes-uepb/query-strings-parser?targetFile=package.json
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[dependencies-image]: https://david-dm.org/nutes-uepb/query-strings-parser.svg
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[dependencies-url]: https://david-dm.org/nutes-uepb/query-strings-parser
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[dependencies-dev-image]: https://david-dm.org/nutes-uepb/query-strings-parser/dev-status.svg
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[dependencies-dev-url]: https://david-dm.org/nutes-uepb/query-strings-parser?type=dev
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[releases-image]: https://img.shields.io/github/release-date/nutes-uepb/query-strings-parser.svg
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[releases-url]: https://github.com/nutes-uepb/ip-allowed/releases
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[contributors-image]: https://img.shields.io/github/contributors/nutes-uepb/query-strings-parser.svg?color=green
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[contributors-url]: https://github.com/nutes-uepb/query-strings-parser/graphs/contributors
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[issues-image]: https://img.shields.io/github/issues/nutes-uepb/query-strings-parser.svg
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[issues-url]: https://github.com/nutes-uepb/query-strings-parser/issues

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