Lanza NPM | npm.io

Lanza

Lanza is a launch-ready server tools package to create APIs

Server

import { Server } from 'lanza';

const server = new Server();
await server.start();

Without any configuration this server already has:

Initialized in the 8000 port
/health endpoint
404 errors
Error handler (no app crashes)
Disabled x-powered-by header
Incoming JSON requests parsed
CORS

Installation

You will have to install the lanza package:

npm install lanza

Options

Option	Default	Description
hostname		Hostname for the API
port	`8000`	Port to access the API
cors	`true`	CORS enabled to accept requests from anywhere
versions	`[]`	API versions. Check below for more details
healthCheck	`null`	Custom /health endpoint response
error404	`null`	Custom 404 error response
maxBodySize	`200mb`	Max body size the API can receive
rawBody	`false`	Option to store the unparsed request in `req.rawBody`
logger	`null`	Custom logger to log errors
appMiddlewares	`null`	Express' application-level middlewares

Versions

You can use various API versions in Lanza. You have to pass the array of versions to the versions option of the server.

Option	Description
path	Path for the versions (e.g. `/v1`)
routes	Array of routes. Check below for more details
middlewares	Array of conditional middlewares for the routes. Check below for more details

Routes

Option	Description
path	Path of the resource without the version path (e.g. `/users`)
method	Method of the request (e.g. `post`)
handler	Function that will handle the request
dto	Function that will get your response and transform it before returning it to the client

Middlewares

Option	Description
condition	Function to check if the path fulfills the condition to execute the middleware
handler	Function that will act as a middleware

Note: The order of the middlewares matter

Responses

There is no need to use res.status(200).send(...) anymore (although you still can).

You can directly return booleans, text, and objects and Lanza will handle the responses for you:

Type	Response
boolean	`{ "success": true }` or `{ "success": false }`
string	Will return the string
JSON	Will return the JSON with its content type

Errors

If an error occurs and it is thrown, Lanza will return the error in a specific format:

{
  "error": {
    "message": "Custom error message"
  }
}

Example

import { Server } from 'lanza';

const server = new Server({
  port: 8008,
  rawBody: true,
  versions: [
    {
      path: '/v1',
      middlewares: [
        {
          condition: (route) => !!route.executeMiddleware,
          handler: (req, _res, next) => {
            req.middlewareExecuted = true;
            next();
          }
        }
      ],
      routes: [
        {
          method: 'get',
          path: '/test',
          executeMiddleware: true,
          handler: (req) => {
            console.log(req.middlewareExecuted);
            return true;
          }
        }
      ],
    }
  ]
});

await server.start();

Making a request to /test would log a true and the client would receive a { "success": true }