---
name: "expressjs"
description: "Scraped from https://expressjs.com/ Source: https://expressjs.com. Use when questions involve: 2024, 2025, de, en, es, fr."
---

# Expressjs

> Official documentation: https://expressjs.com

## Overview

This skill provides comprehensive documentation for expressjs.

**Total references:** 141 files (~1,248,723 tokens)

**Topics covered:**
Moderate severity vulnerability CVE-2024-43796 in Express core, 모델을 어떻게 정의해야 합니까, Autres considérations, Performance, Middleware integrato, Cómo configuro un manejador de errores, Exemplos adicionais, 性能表现, Prototype, 如何处理 404 响应, 移行の例, 路由路径...

## Reference Files

Load only the reference files relevant to the user's question:

### 2024

- **[Welcome to The Express Blog! and more](references/2024.md)** (~4,850 tokens)
  - Topics: High severity vulnerability CVE-2024-45590 in body-parser middleware, High severity vulnerability CVE-2024-47178 in basic-auth-connect middleware, Moderate severity vulnerability CVE-2024-43796 in Express core

### 2025

- **[A New Chapter for Express.js: Triumphs of 2024 and an ambitious 2025 and more](references/2025.md)** (~6,670 tokens)
  - Topics: A Transformative 2024, A Bold Vision for 2025, The Road Ahead

### De

- **[3.x](references/de-1.md)** (~2,841 tokens)
  - Topics: Application
- **[4.x](references/de-2.md)** (~21,057 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/de-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[Best Practices in Produktionsumgebungen: Leistung und Zuverlässigkeit and more](references/de-4.md)** (~7,870 tokens)
  - Topics: Things to do in your code, Things to do in your environment  setup, Überblick
- **[5.x API](references/de-5.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[Express hinter Proxys and more](references/de-6.md)** (~7,360 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Wechsel zu Express 5 and more](references/de-7.md)** (~7,991 tokens)
  - Topics: Überblick, Express 5 Codemods, Änderungen in Express 5
- **[Template and more](references/de-8.md)** (~6,706 tokens)
  - Topics: Überblick, Technical committee, Express is made of many modules
- **[body and more](references/de-9.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/de-10.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/de-11.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/de-12.md)** (~7,871 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/de-13.md)** (~2,908 tokens)
  - Topics: Additional examples, Wie muss ich meine Anwendung strukturieren, Wie definiere ich Modelle

### En

- **[3.x API](references/en-1.md)** (~7,060 tokens)
  - Topics: express, Application, Request
- **[4.x API](references/en-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/en-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[Production best practices: performance and reliability and more](references/en-4.md)** (~7,732 tokens)
  - Topics: Things to do in your code, Things to do in your environment  setup, Overview
- **[5.x API](references/en-5.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[Express Blog Posts and more](references/en-6.md)** (~6,007 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Moving to Express 4 and more](references/en-7.md)** (~6,672 tokens)
  - Topics: Overview, Changes in Express 4, Example app migration
- **[Routing and more](references/en-8.md)** (~6,411 tokens)
  - Topics: Route methods, Route paths, Route parameters
- **[Contributing to Express and more](references/en-9.md)** (~5,775 tokens)
  - Topics: Technical committee, Community contributing guide, Collaborators guide
- **[body and more](references/en-10.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/en-11.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/en-12.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/en-13.md)** (~7,841 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/en-14.md)** (~2,922 tokens)
  - Topics: Additional examples, How should I structure my application, How do I define models

### Es

- **[API de 3.x](references/es-1.md)** (~2,848 tokens)
  - Topics: Application
- **[API de 4.x](references/es-2.md)** (~21,062 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/es-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[Production best practices: performance and reliability and more](references/es-4.md)** (~7,530 tokens)
  - Topics: Cosas que hacer en el código, Cosas que hacer en el entorno  configuración, Overview
- **[Actualizaciones de seguridad](references/es-5.md)** (~1,053 tokens)
- **[5.x API](references/es-6.md)** (~20,043 tokens)
  - Topics: express, Application, Request
- **[Express detrás de proxies and more](references/es-7.md)** (~7,368 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Migración a Express 5 and more](references/es-8.md)** (~6,606 tokens)
  - Topics: Overview, Express 5 Codemods, Changes in Express 5
- **[Utilización del middleware and more](references/es-9.md)** (~3,192 tokens)
  - Topics: Application-level middleware, Middleware de nivel de direccionador, Error-handling middleware
- **[Contribuir a Express and more](references/es-10.md)** (~5,526 tokens)
  - Topics: Technical committee, Community contributing guide, Collaborators guide
- **[body and more](references/es-11.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/es-12.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/es-13.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/es-14.md)** (~7,944 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/es-15.md)** (~3,030 tokens)
  - Topics: Additional examples, How should I structure my application, Cómo debo definir los modelos

### Fr

- **[API 3.x](references/fr-1.md)** (~2,845 tokens)
  - Topics: Application
- **[API 4.x](references/fr-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/fr-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[Meilleures pratiques en production : performances et fiabilité and more](references/fr-4.md)** (~7,599 tokens)
  - Topics: A faire dans votre code, A faire dans votre environnementconfiguration, Présentation
- **[Mises à jour de sécurité](references/fr-5.md)** (~1,012 tokens)
- **[5.x API](references/fr-6.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[Serveurs proxy derrière Express and more](references/fr-7.md)** (~7,832 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Migration vers Express 5 and more](references/fr-8.md)** (~6,663 tokens)
  - Topics: Présentation, Express 5 Codemods, Modifications dans Express 5
- **[Utilisation de middleware and more](references/fr-9.md)** (~3,122 tokens)
  - Topics: Middleware niveau application, Middleware niveau routeur, Middleware de traitement derreurs
- **[Contributing to Express and more](references/fr-10.md)** (~5,513 tokens)
  - Topics: Technical committee, Community contributing guide, Collaborators guide
- **[body and more](references/fr-11.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/fr-12.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/fr-13.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/fr-14.md)** (~7,935 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/fr-15.md)** (~3,084 tokens)
  - Topics: Additional examples, Comment puis-je structurer mon application, Comment puis-je définir des modèles

### General

- **[Fast, unopinionated, minimalist web framework forNode.js and more](references/general.md)** (~2,637 tokens)
  - Topics: Web Applications, APIs, Performance

### It

- **[API 3.x](references/it-1.md)** (~2,840 tokens)
  - Topics: Application
- **[API 4.x](references/it-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/it-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[Best practice sulla produzione: prestazioni e affidabilità and more](references/it-4.md)** (~7,398 tokens)
  - Topics: Things to do in your code, Operazioni da effettuare nellambiente  configurazione, Panoramica
- **[Aggiornamenti sulla sicurezza](references/it-5.md)** (~993 tokens)
- **[5.x API](references/it-6.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[Express con i proxy and more](references/it-7.md)** (~7,553 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Passaggio a Express 5 and more](references/it-8.md)** (~6,498 tokens)
  - Topics: Panoramica, Express 5 Codemods, Modifiche in Express 5
- **[Utilizzo del middleware and more](references/it-9.md)** (~7,965 tokens)
  - Topics: Middleware a livello dellapplicazione, Middleware a livello del router, Middleware di gestione degli errori
- **[Glossario and more](references/it-10.md)** (~6,657 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/it-11.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/it-12.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/it-13.md)** (~7,876 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/it-14.md)** (~2,965 tokens)
  - Topics: Additional examples, In che modo devo strutturare lapplicazione, In che modo è possibile definire i modelli

### Ja

- **[3.x API](references/ja-1.md)** (~2,814 tokens)
  - Topics: Application
- **[4.x API](references/ja-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/ja-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[実稼働環境におけるベスト・プラクティス: パフォーマンスと信頼性 and more](references/ja-4.md)** (~6,260 tokens)
  - Topics: コードで実行する処理, 環境セットアップで実行する処理, 非推奨バージョンや脆弱なバージョンの Express を使用しない
- **[5.x API](references/ja-5.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[プロキシーの背後の Express and more](references/ja-6.md)** (~5,283 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Express 5 への移行 and more](references/ja-7.md)** (~7,540 tokens)
  - Topics: Express 5 Codemods, Express 5 における変更点, 削除されたメソッドとプロパティー
- **[Contributing to Express and more](references/ja-8.md)** (~5,333 tokens)
  - Topics: Technical committee, Community contributing guide, Collaborators guide
- **[body and more](references/ja-9.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/ja-10.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/ja-11.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/ja-12.md)** (~7,720 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/ja-13.md)** (~2,410 tokens)
  - Topics: Additional examples, どのようにしてアプリケーションを構成するのですか, どのようにしてモデルを定義するのですか

### Ko

- **[3.x API](references/ko-1.md)** (~7,044 tokens)
  - Topics: express, Application, Request
- **[4.x API](references/ko-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/ko-3.md)** (~20,049 tokens)
  - Topics: express, Application, Request
- **[프로덕션 우수 사례: 성능 및 신뢰성 and more](references/ko-4.md)** (~6,524 tokens)
  - Topics: 코드에서 해야 할 일, 환경설정에서 수행할 항목, 더 이상 사용되지 않거나 취약성이 있는 버전의 Express를 사용 중지
- **[5.x API](references/ko-5.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[프록시 환경에서 Express 사용 and more](references/ko-6.md)** (~6,485 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Express 5로의 이전 and more](references/ko-7.md)** (~7,558 tokens)
  - Topics: Express 5 Codemods, Express 5에서의 변경사항, 제거된 메소드 및 특성
- **[Express와 함께 템플리트 엔진 사용 and more](references/ko-8.md)** (~6,518 tokens)
  - Topics: Technical committee, Express is made of many modules, Github Discussions
- **[body and more](references/ko-9.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/ko-10.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/ko-11.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/ko-12.md)** (~7,764 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/ko-13.md)** (~2,648 tokens)
  - Topics: Additional examples, 애플리케이션을 어떻게 구조화해야 합니까, 모델을 어떻게 정의해야 합니까

### Pt Br

- **[3.x API](references/pt-br-1.md)** (~2,841 tokens)
  - Topics: Application
- **[API 4.x](references/pt-br-2.md)** (~21,062 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/pt-br-3.md)** (~20,055 tokens)
  - Topics: express, Application, Request
- **[Melhores Práticas de Produção: desempenho e confiabilidade and more](references/pt-br-4.md)** (~7,693 tokens)
  - Topics: Itens a fazer no seu código, Coisa a se fazer no seu ambiente  configuração, Visão Geral
- **[Atualizações de segurança](references/pt-br-5.md)** (~1,007 tokens)
- **[5.x API](references/pt-br-6.md)** (~20,042 tokens)
  - Topics: express, Application, Request
- **[Express atrás de proxies and more](references/pt-br-7.md)** (~7,738 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[Migrando para o Express 5 and more](references/pt-br-8.md)** (~6,559 tokens)
  - Topics: Visão Geral, Express 5 Codemods, Mudanças no Express 5
- **[Usando middlewares and more](references/pt-br-9.md)** (~3,117 tokens)
  - Topics: Middleware de nível do aplicativo, Middleware de nível de roteador, Middleware de manipulação de erros
- **[Contributing to Express and more](references/pt-br-10.md)** (~5,512 tokens)
  - Topics: Comitê técnico, Community contributing guide, Collaborators guide
- **[body and more](references/pt-br-11.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/pt-br-12.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/pt-br-13.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/pt-br-14.md)** (~7,889 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/pt-br-15.md)** (~3,022 tokens)
  - Topics: Exemplos adicionais, Como eu devo estruturar meu aplicativo, Como eu defino modelos

### Zh Cn

- **[3.x API](references/zh-cn-1.md)** (~2,839 tokens)
  - Topics: Application
- **[4.x API](references/zh-cn-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/zh-cn-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[生产环境最佳实践：性能和可靠性 and more](references/zh-cn-4.md)** (~6,526 tokens)
  - Topics: Things to do in your code, 环境设置中的注意事项, 请勿使用不推荐或者存在漏洞的 Express 版本
- **[5.x API](references/zh-cn-5.md)** (~20,021 tokens)
  - Topics: express, Application, Request
- **[代理背后的 Express and more](references/zh-cn-6.md)** (~5,785 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[迁移到 Express 5 and more](references/zh-cn-7.md)** (~7,920 tokens)
  - Topics: Express 5 Codemods, Express 5 中的更改, 已移除的方法和属性
- **[Contributing to Express and more](references/zh-cn-8.md)** (~5,332 tokens)
  - Topics: Technical committee, Community contributing guide, Collaborators guide
- **[body and more](references/zh-cn-9.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/zh-cn-10.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/zh-cn-11.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/zh-cn-12.md)** (~7,716 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/zh-cn-13.md)** (~2,359 tokens)
  - Topics: Additional examples, 如何构造自己的应用程序, 如何定义模型

### Zh Tw

- **[3.x API](references/zh-tw-1.md)** (~2,839 tokens)
  - Topics: Application
- **[4.x API](references/zh-tw-2.md)** (~21,060 tokens)
  - Topics: express, Application, Request
- **[5.x API](references/zh-tw-3.md)** (~20,051 tokens)
  - Topics: express, Application, Request
- **[正式作業最佳作法：效能和可靠性 and more](references/zh-tw-4.md)** (~6,960 tokens)
  - Topics: Things to do in your code, 在環境  設定中的作法, 請勿使用已淘汰或有漏洞的 Express 版本
- **[5.x API](references/zh-tw-5.md)** (~20,038 tokens)
  - Topics: express, Application, Request
- **[位於 Proxy 背後的 Express and more](references/zh-tw-6.md)** (~5,157 tokens)
  - Topics: Cassandra, Couchbase, CouchDB
- **[移至 Express 5 and more](references/zh-tw-7.md)** (~7,763 tokens)
  - Topics: Express 5 Codemods, Express 5 中的變更, 已移除的方法和內容
- **[撰寫中介軟體以用於 Express 應用程式中 and more](references/zh-tw-8.md)** (~6,054 tokens)
  - Topics: Technical committee, Express is made of many modules, Github Discussions
- **[body and more](references/zh-tw-9.md)** (~6,097 tokens)
  - Topics: Installation, API, Errors
- **[cookie and more](references/zh-tw-10.md)** (~7,428 tokens)
  - Topics: Install, API, Examples
- **[Multer and more](references/zh-tw-11.md)** (~5,370 tokens)
  - Topics: Translations, Installation, Usage
- **[express and more](references/zh-tw-12.md)** (~7,774 tokens)
  - Topics: Installation, API, Session Store Implementation
- **[Express examples and more](references/zh-tw-13.md)** (~2,511 tokens)
  - Topics: Additional examples, 我該如何建立我的應用程式結構, 如何定義模型

## Usage Guidelines

1. **Identify relevant sections** - Match the user's question to the appropriate reference file(s)
2. **Load minimally** - Only read files directly relevant to the question to conserve context
3. **Cite sources** - Reference specific sections when answering
4. **Combine knowledge** - For complex questions, you may need multiple reference files

### When to use each reference:

- **2024**: 2024-related features and documentation
- **2025**: 2025-related features and documentation
- **De**: De-related features and documentation
- **En**: En-related features and documentation
- **Es**: Es-related features and documentation
- **Fr**: Fr-related features and documentation
- **General**: General documentation, overview, and getting started
- **It**: It-related features and documentation
- **Ja**: Ja-related features and documentation
- **Ko**: Ko-related features and documentation
- **Pt Br**: Pt Br-related features and documentation
- **Zh Cn**: Zh Cn-related features and documentation
- **Zh Tw**: Zh Tw-related features and documentation
