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@vladbasin/strong-api-middleware

v1.3.2

Published

Strongly typed API middleware

Downloads

313

Readme

Strong API middleware

Strongly typed API middleware. Generic library which can be integrated with any HTTP stack.

Installation

npm

npm install @vladbasin/strong-api-middleware @vladbasin/strong-api-mapping reflect-metadata joi

yarn

yarn add @vladbasin/strong-api-middleware @vladbasin/strong-api-mapping reflect-metadata joi

Usage

This is a generic middleware library. You can integrate it with any HTTP stack. Currently the following packages use this library:

Step-by-step guide

  1. Import reflect-metadata ONCE in your index file:
import 'reflect-metadata';
  1. Define your model
import { body, header, path, query } from '@vladbasin/strong-api-mapping';

export class RequestPayload {
    @path()
    public userId!: number;

    @path({ key: 'userId' })
    public id!: number;

    @query()
    public name!: string;

    @query()
    public isAdmin!: boolean;

    @query({ key: 'lastname' })
    public surname!: string;

    @query({ parser: String })
    public cars!: string[];

    @query({ parser: Number })
    public cash!: number[];

    @body()
    public details!: DetailsType;

    @header({ key: 'Content-Type' })
    public contentType!: string;

    @header({ key: 'X-Info', parser: String })
    public info!: string[];
}
  1. Define validation rules with Joi
export const RequestPayloadSchema = Joi.object<RequestPayload>({
    surname: Joi.string().min(10),
    cars: Joi.array().max(3),
    // other rules for field content...
});
  1. Call handleStrongApiRequest() when you want to process HTTP request
handleStrongApiRequest({
    // configure request handling
    request: {
        // define request payload model which will be automapped
        payload: {
            Model: RequestPayload,
            schema: RequestPayloadSchema,
        },
        provideRaw: () => {
            // synchronously or ASYNChronously provide RawApiRequest object (headers, body, query string) based on your HTTP stack
            // you can also provide CustomApiRequestDataType values to introduce and feed custom decorators with data
        },
        handle: ({ payload }) => {
            // handle api request
            // return ApiResponseType<TSuccessModel, TErrorModel>
        },
    },
    // configure response handling
    response: {
        // process request handling error
        processFailure: {
            options: {
                // output possibly sensitive information (useful for debugging)
                allowSensitive: true,
            },
            // OPTIONAL
            responseCreator: (error, options, defaultResponseCreator) => { 
                // create ApiResponseType<TSuccessModel, TErrorModel> when error happens (by default done by this library automatically)
            },
        },
    },
});

This method returns RawApiResponseType which you can later convert to your HTTP stack specific output. For example, @vladbasin/strong-api-middleware-aws-lambda converts it to AWS Lambda function response.

export type RawApiResponseType = {
    statusCode: number;
    headers?: MaybeNullable<Record<string, Maybe<string>>>;
    multiValueHeaders?: MaybeNullable<Record<string, Maybe<string[]>>>;
    body?: MaybeNullable<string>;
};

In addition, you can share request/response models with your API consumers, so they don't need to repeat the same mapping & validation logic. See: @vladbasin/strong-api-client