README.md

Express Query Adapter

Easily transform an Express req.query into your favourite query tool






Contributing · License

Installation

npm install @tool-kid/express-query-adapter

How it works?

Usage

Use getQueryBuilder exported from package and pass your req.query as an argument:

import { getQueryBuilder } from '@tool-kid/express-query-adapter';

const builder = await getQueryBuilder({ adapter: 'typeorm' });
const builtQuery = builder.build(req.query);
// Now your query is built, pass it to your favourite tool
const results = await fooRepository.find(builtQuery);

Adapters

• TypeORM

TypeORM

Given the following url query string:

foo/?name__contains=foo&role__in=admin,common&age__gte=18&page=3&limit=10

It will be transformed into:

{
  where: {
    foo: Like('%foo%'),
    role: In(['admin', 'common']),
    age: MoreThanOrEqual(18)
  },
  skip: 20,
  take: 10
}

Different ways of retrieve data

GET, POST method by url query string

GET foo/?name__contains=foo&role__in=admin,common&age__gte=18&page=3&limit=10

POST foo/?name__contains=foo&role__in=admin,common&age__gte=18&page=3&limit=10

app.get('/foo', (req, res) => {
  const qb = await getQueryBuilder({ adapter: 'typeorm' });
  const built = qb.build(req.query); // => Parsed into req.query
});

POST method by body

POST foo/, body: {
  "name__contains": "foo",
  "role__in": "admin,common",
  "age__gte": 18,
  "page": 3,
  "limit": 10
}

app.post('/foo', (req, res) => {
  const qb = await getQueryBuilder({ adapter: 'typeorm' });
  const built = qb.build(req.query); // => Parsed into req.body
});

Available Lookups

Lookup	Behaviour	Example
(none)	Return entries that match with value	foo=raul
contains	Return entries that contains value	foo__contains=lopez
startswith	Return entries that starts with value	foo__startswith=r
endswith	Return entries that ends with value	foo__endswith=dev
icontains	Return entries that contains value and ignoring case	foo__icontains=Lopez
istartswith	Return entries that starts with value and ignoring case	foo__istartswith=R
iendswith	Return entries that ends with value and ignoring case	foo__iendswith=Dev
isnull	Return entries with null value	foo__isnull
lt	Return entries with value less than or equal to provided	foo__lt=18
lte	Return entries with value less than provided	foo__lte=18
gt	Returns entries with value greater than provided	foo__gt=18
gte	Return entries with value greater than or equal to provided	foo__gte=18
in	Return entries that match with values in list	foo__in=admin,common
between	Return entries in range (numeric, dates)	foo__between=1,27

Notice: you can use negative logic prefixing lookup with __not.

Example: foo__not__contains=value

Options

Pagination

Option	Default	Behaviour	Example
pagination	true	If true, paginate results. If false, disable pagination	pagination=false
page	1	Return entries for page page	page=2
limit	25	Return entries for page page paginated by size limit	limit=15

Ordering

Option	Default	Behaviour	Example
order	-	Order for fields: +: Ascendant -: Descendant	order=+foo,-name,+surname

Selection

Option	Default	Behaviour	Example
select	-	Fields to select as response. If no provided, it select all fields.	select=name,surname,foo.nested
with	-	Entity relations to attach to query	with=posts,comments

Profile

If you need to disable some capabilities, you can do using shortcuts to enable|disable by default or provide a custom Profile.

A Profile describe capabilities that can be used by clients & its behaviour.

const qb = getQueryBuilder({ adapter: 'typeorm', profile: 'enabled' | 'disabled' | ConfigProgile });
const builtQuery = builder.build(req.query);

ConfigProfile

ConfigProfile object looks like:

const customProfile: ConfigProfile = {
  options: {
    pagination: {
      status: 'enabled',
      paginate: true,
      itemsPerPage: 25,
    },
    ordering: {
      status: 'enabled',
    },
    relations: {
      status: 'enabled',
    },
    select: {
      status: 'enabled',
    },
  },
  policy: 'skip',
};

Field	Default	Behaviour	Type
options	'enabled'	Profile options	ProfileOptions
policy	'skip'	Policy to apply in cases client try use disabled options	FindPolicyType