João Marins jgcmarins

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Node.js API Performance Playbook

Goal

Maximize throughput and reduce latency without changing infrastructure.

This playbook documents practical patterns that scaled an API from 100 req/s → 50,000 req/s on the same machine and database.

Node.js API Performance Optimization — Technical Specification

Overview

This document outlines performance optimization best practices for Node.js APIs based on real-world improvements where throughput increased from 100 req/s to 50,000 req/s on the same infrastructure (same machine and database).

No changes were made to:

Programming language
System architecture

check mongod process

sudo lsof -iTCP -sTCP:LISTEN -n -P

kill the process

sudo kill <mongod_pid>

	FROM node:22.16-alpine AS builder
	WORKDIR /app
	COPY package.json yarn.lock ./
	RUN yarn install --frozen-lockfile
	COPY . .
	RUN yarn build
	RUN rm -rf node_modules && yarn install --production --frozen-lockfile

	FROM alpine AS runtime
	WORKDIR /app

	MYSQL_ROOT_PASSWORD=
	MYSQL_DATABASE=
	MYSQL_USER=
	MYSQL_PASSWORD=

	/* eslint-disable react-hooks/rules-of-hooks */
	// 24:33 error React Hook "useNextRouter" is called conditionally. React Hooks must be called in the exact same order in every component render react-hooks/rules-of-hooks
	// 25:43 error React Hook "useReactRouterNavigate" is called conditionally. React Hooks must be called in the exact same order in every component render react-hooks/rules-of-hooks
	// 43:35 error React Hook "useNextPathname" is called conditionally. React Hooks must be called in the exact same order in every component render react-hooks/rules-of-hooks
	// 44:37 error React Hook "useReactRouterLocation" is called conditionally. React Hooks must be called in the exact same order in every component render react-hooks/rules-of-hooks

	'use client';

	import { usePathname as useNextPathname, useRouter as useNextRouter } from 'next/navigation';
	import {

	// https://github.com/vitest-dev/vitest/issues/1575#issuecomment-1439286286
	export const setup = () => {
	process.env.TZ = 'UTC';
	process.env.NODE_ENV = 'test';
	// add process.env mocks
	};

	# serverless-api-gateway.yml
	service: central-api-gateway

	provider:
	name: aws
	runtime: nodejs14.x
	stage: dev
	region: sua-região

	resources:

	/**

	Given an integer array arr of distinct integers and an integer k.
	A game will be played between the first two elements of the array (i.e. arr[0] and arr[1]). In each round of the game, we compare arr[0] with arr[1], the larger integer wins and remains at position 0, and the smaller integer moves to the end of the array. The game ends when an integer wins k consecutive rounds.
	Return the integer which will win the game.
	It is guaranteed that there will be a winner of the game.

	Example 1:
	Input: arr = [2,1,3,5,4,6,7], k = 2
	Output: 5