Exhandlers NPM

Express Handlers

Utility Middlewares for working with Express.js

A simple middleware package for Express applications.

Documentation

Exhandlers Documentation

Handlers

Async Handler
CORS Handler
Error Handler
Log Handler
Not Found Handler
Hash Handler
Password Handler
MongoDB Handler
Postgres Handler
Redis Handler

Installation

You can install exhandlers using npm:

npm install exhandlers

Usage

Contents of your entry point file would look like this

const express = require("express");
const {
  asyncHandler,
  errorHandler,
  logHandler,
  notFoundHandler,
  corsHandler,
  passwordHandler,
  hashHandler,
  mongoHandler,
  initPostgres,
  initRedis,
  transports,
  initLogger,
  streamHandler,
} = require("exhandlers");
const User = require("path/to/userModel");

const app = express();

// Use CORS handler
app.use(corsHandler("http://localhost:3000, http://127.0.0.1:4321"));

const logger = initLogger({ transports });
// Use logging middleware
app.use(logHandler("combined", { stream: streamHandler(logger) }));

// Define routes with asyncHandler
app.get(
  "/api/data",
  asyncHandler(async (req, res) => {
    const data = await fetchData(); // Replace with your async logic
    res.json(data);
  }),
);

// Use hashHandler to hash password
app.post(
  "/api/auth/register",
  asyncHandler(async (req, res) => {
    const { password } = req.body;

    const hashedPassword = await hashHandler(password);
  }),
);

// Use passwordHandler to compare passwords
app.post(
  "/api/auth/login",
  asyncHandler(async (req, res) => {
    const { email, password } = req.body;

    const user = await User.findOne({ email });

    const hashedPassword = user.password;

    const passwordMatch = await passwordHandler(password, hashedPassword);

    if (!passwordMatch) {
      throw new Error("Invalid credentials");
    }
  }),
);

// Use Not Found handler for undefined routes
app.use(notFoundHandler);

// Use error handler at the end of the middleware stack
app.use(errorHandler);

const PORT = 3000;

// Use mongoHandler to connect to mongodb database
mongoHandler(
  "mongodb://<username>:<password>@<host>:<port>/<database>?options",
);
// or
// Use initPostgres to connect to postgres database and postgresHandler to make queries
const pool = initPostgres({
  connectionString: "postgres://<user>:<password>@<host>:<port>/<database>",
});

// Use initRedis to connect with redis
const client = initRedis({ url: "redis://<user>:<password>@<host>:<port>" });

app.listen(PORT, async () => {
  console.log(`Server running @ port ${PORT}`);
});