validate-request-parameters

The purpose of this module is to enable configurable query parameter validation from HTTP request events, such as API Gateway Events or Express Routes.

Key Features

• Type Coercion
• Type Enforcement
• Default Values
• Defined Value Options
• Regular Expression Matching
• Apply Transforms to Values
• Numeric Value Ranges
• String Length Ranges

Working

• AWS APIGatewayEvent Handling (Lambda)
• Query String Parameter Validation

Not Working, yet

• Multi Value Query String Parameters
• Request Body JSON Validation
• Express.js Support

Lambda API Gateway Example

// https://.../query?searchTerm=code&limit=10&offset=10&order=asc&orderBy=name

import {
  validateAPIGatewayEvent,
  QueryStringValueTypes,
} from '@doneee/validate-request-parameters';

import { toUpperCase, toLowerCase } from '@doneee/composable-transform-functions';

const config = {
	queryStringParameters: {
		offset: {
			type: QueryStringValueTypes.Integer,
			min: 0,
			defaultValue: 0,
		},
		limit: {
			type: QueryStringValueTypes.Integer,
			min: 1,
			max: 100,
			defaultValue: 10,
		},
		searchTerm: {
			type: QueryStringValueTypes.String,
			regex: /[a-z0-9]+/gi,
			min: 4,
			max: 75,
		},
		order: {
			type: QueryStringValueTypes.String,
			options: ['ASC', 'DESC'],
			defaultValue: 'ASC',
			transforms: [ toUpperCase ],
		},
		orderBy: {
			type: QueryStringValueTypes.String,
			transforms: [ toLowerCase ],
			options: [
				'name',
				'date',
			],
			defaultValue: 'name',
		},
	},
};

exports.handler = (event) => {
  const [ params, paramErrors ] = validateAPIGatewayEvent(event, config);
  
  // params = {
  //  queryStringParameters: {
  //    offset: 10,
  //    limit: 10,
  //    searchTerm: 'code',
  //    order: 'ASC',
  //    orderBy: 'name',
  //   },
  // };

  // Use params without needing to do additional type checks or validation
}