umid

Universal Middleware

Fast, lightweight middleware framework.

Features

• Lightweight -

• Browser and Node - Use in browser and node

• Async Await and Promise support - Support both async await and promise functions

• No Dependency - No Bloating. No external dependencies

• Express.js style middlware - Express.js like design

yarn: yarn add umid

npm: npm i umid

cdn: https://unpkg.com/umid

module: https://unpkg.com/umid?module

Installation

To use this utility, simply import it into your project:

import { run } from "umid";

Usage

The run function accepts a mode and returns a function that accepts an array of functions to be executed asynchronously. The execution behavior depends on the mode specified.

Parameters

• mode (optional): Specifies the execution mode. Default is 0.
• ...fns: An array of functions to be executed.
• ...args: Parameters to be passed to the functions.

Modes

1. Mode 0: (Default) Without next
2. Mode 1: With next

Examples

Mode 0: Without next

In this mode, the functions are called sequentially without a next callback.

const runWithoutNext = run(0);

const fn1 = async (param1, param2) => {
	console.log("fn1", param1, param2);
};

const fn2 = async (param1, param2) => {
	console.log("fn2", param1, param2);
	return "result2";
};

runWithoutNext(fn1, fn2)("hello", "world")
	.then((result) => console.log("Final result:", result))
	.catch((err) => console.error("Error:", err));

Mode 1: With next

In this mode, the functions are called sequentially with a next callback, which must be called to proceed to the next function.

const runWithNext = run(1);

const fn1 = async (param1, param2, next) => {
	console.log("fn1", param1, param2);
	next();
};

const fn2 = async (param1, param2, next) => {
	console.log("fn2", param1, param2);
	next();
	// next('not authorized'); // not authorized error
};

runWithNext(fn1, fn2)("hello", "world")
	.then(() => console.log("All functions executed"))
	.catch((err) => console.error("Error:", err));

Creating a express middleware utility

const expressMiddleware = run(1);

const fn1 = async (req) => {
	console.log('fn1');
};

const fn2 = async (req) => {
	console.log('fn2');
};

const expressMiddleware = (req, res, next) => {
	console.log('ex middleware', req, res, next);
	setTimeout(() => {
		next();
	}, 1000)
}
const fn3 = async (req) => "over";
const req = {};
const res = {};

run()(fn1, expressMiddleware(expressMiddleware), fn2, fn3)(req, res).then(console.log).catch(console.log);

API

run(mode) => (...fns) => async (...args) => Promise

Parameters:

• mode: Number (optional) - Execution mode (0, 1). Default is 0.
• ...fns: Array - Functions to be executed.
• ...args: Array - Parameters to be passed to the functions.

Returns:

• Promise: Resolves when all functions are executed or when a function returns a result (in mode 0).

License

This project is licensed under the MIT License. See the LICENSE file for details.