README

@CentralPing/json-api-query

An extensible JSON Schema for validating and optionally coercing JSON API query parameters for fetching data.

Notes

The request querystring is expected to have been parsed into an object.

// Example Original URL:
// http://localhost:3000/?include=author&fields%5Barticles%5D=title%2Cbody&fields%5Bpeople%5D=name

// Parsed querystring:
{
  include: 'author',
  fields: {
    articles: ['title', 'body']
  },
  fields: {
    people: 'name'
  }
}

The values of the query object can be strings or coerced to expected value types prior to validation. By default the object values will be coerced if strings and validation succeeds.
Per the JSON API specification, any additional query parameters are ignored for validation and coercion by the validation method.

Installation

npm i --save @centralping/json-api-query

API Reference

jsonApiQuery~schema : `Object`

Module property that generates a new deep copy of the default schema on every import. Apply any extensions and provide as an optional schema for the validate method.

Kind: inner property of jsonApiQuery

jsonApiQuery~parse ⇒ `Object`

Kind: inner property of jsonApiQuery
Returns: Object - A url parse object.

Param	Type	Description
url	`String`	Any URL string.

Example

const url = '/foo/bar?include=author&fields%5Barticles%5D=title%2Cbody&fields%5Bpeople%5D=name';
const {query, pathname, ...extra} = parse(url);
// query
// {
//   include: [ 'author' ],
//   fields: {
//     articles: ['title', 'body'],
//     people: ['name']
//   }
// }
// pathname
// '/foo/bar'

jsonApiQuery~validate ⇒ `function`

Kind: inner property of jsonApiQuery
Returns: function - the configured validator function

Param	Type	Default	Description
[options]	`Object`		any AJV option.
[options.coerceTypes]	`Boolean` \| `String`	`'array'`	coerce validated values to specified types.
[options.ownProperties]	`Boolean`	`true`	restrict validation to own properties of data object.
[schema]	`Object`		JSON Schema. Defaults to the included `schema`.

Example

const validator = validate();
const valid = validator(queryParams); // where queryParams is an object

if (!valid) {
  // Log errors
  console.log(validator.errors);
}

Examples

For Default Verification

const {validate} = require('@centralping/json-api-query');

const validator = validate();

// queryParams would be an query param object to validate/coerce
const valid = validator(queryParams);

if (!valid) {
  // Log errors
  console.log(validator.errors);
}

For Extended Verification

const {validate, schema} = require('@centralping/json-api-query');

// extend schema

const validator = validate(undefined, schema);

// queryParams would be an query param object to validate/coerce
const valid = validator(queryParams);

if (!valid) {
  // Log errors
  console.log(validator.errors);
}

For AJV options

const {validate} = require('@centralping/json-api-query');

const validator = validate({allErrors: true});

// queryParams would be an query param object to validate/coerce
const valid = validator(queryParams);

if (!valid) {
  // Log errors
  console.log(validator.errors);
}

For Parsing & Verification

const {parse, validate} = require('@centralping/json-api-query');

const validator = validate();
const {query} = parse(url); // url is a string

const valid = validator(query);

if (!valid) {
  // Log errors
  console.log(validator.errors);
}

Test

npm test

With coverage reporting:

npm test -- --coverage

With file watch:

npm run watch

License

MIT

Usage no npm install needed!