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npm version Build Status

path-parser

A small library to parse and build paths. It can be used to partially or fully test paths against a defined pattern.

Partial testing allows to determine if a given path starts with the defined pattern. It is used by route-node

import { Path } from 'path-parser'
// or
const { Path } = require('path-parser')

const path = new Path('/users/:id')

// Matching
path.test('/users/00123')
// {
//  id: "00123"
// }

// Partial testing: does the provided path
// starts with the defined pattern?
path.partialTest('/users/00123/orders')
// {
//  id: "00123"
// }
path.partialTest('/profile/00123/orders')
// null

// Building
path.build({ id: '00123' })
// => "/users/00123"

Without new:

const path = Path.createPath('/users/:id')

Defining parameters

  • :param: for URL parameters
  • ;param: for matrix parameters
  • *splat: for parameters spanning over multiple segments. Handle with care
  • ?param1&param2 or ?:param1&:param2: for query parameters. Colons : are optional.

Parameter constraints

For URL parameters and matrix parameters, you can add a constraint in the form of a regular expression. Note that back slashes have to be escaped.

  • :param<\\d+> will match numbers only for parameter param
  • ;id<[a-fA-F0-9]{8} will match 8 characters hexadecimal strings for parameter id

Constraints are also applied when building paths, unless specified otherwise (set option flag ignoreConstraints to true).

// Path.build(params, opts)
var Path = new Path('/users/:id<d+>')

path.build({ id: 'not-a-number' }) // => Will throw an error
path.build({ id: '123' }) // => '/users/123'

API

Constructor

A path instance can be created two ways:

  • new Path(path: string, opts?: object): object
  • Path.create(path: string, opts?: object): object

Options available are:

  • 'queryParams': options for query parameters
  • 'urlParamsEncoding, to specify how URL parameters are encoded and decoded:
    • 'default':encodeURIComponentanddecodeURIComponentare used but some characters to encode and decode URL parameters, but some characters are preserved when encoding (sub-delimiters:+,:,',!,,,;,'*'`).
    • 'uriComponent': use encodeURIComponent and decodeURIComponent for encoding and decoding URL parameters.
    • 'uri': use encodeURI and `decodeURI for encoding amd decoding URL parameters.
    • 'none': no encoding or decoding is performed
    • 'legacy': the approach for version 5.x and below (not recoomended)

path.test(path: string, opts?: object): object | null;

Test if the provided path matches the defined path template. Options available are:

  • 'caseSensitive': whether matching should be case sensitive or not (default to false)
  • 'strictTrailingSlash': whether or not it should strictly match trailing slashes (default to false)

path.partialTest(path: string, opts?: object): object | null;

Test if the provided path is partially matched (starts with) the defined path template. Options available are:

  • 'caseSensitive': whether matching should be case sensitive or not (default to false)
  • 'delimited': whether or not a partial match should only be successful if it reaches a delimiter (/, ?, . and ;). Default to true.
  • 'queryParams': to overwrite query parameter options (see above)
  • 'urlParamsEncoding: to overwrite URL param encoding and decoding option (see above)

path.build(params?: object, opts?: object): string;

Builds the defined path template with the provided parameters

  • 'caseSensitive': whether matching should be case sensitive or not (default to false)
  • 'ignoreConstraints': whether or not to ignore parameter constraints (default to false)
  • 'ignoreSearch': whether or not to build query parameters (default to false)
  • 'queryParams': to overwrite query parameter options (see above)
  • 'urlParamsEncoding: to overwrite URL param encoding and decoding option (see above)

Related modules

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A small utility to parse paths.

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