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Express.js

Fast, unopinionated, minimalist web framework for Node.js.

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Field note

What it does

Express is a minimal and flexible Node.js web application framework providing routing and middleware.

Capabilities

Available capabilities

RoutingBuilt-in middlewareMiddlewareTemplate RenderingTrust proxy configurationClient IP detection behind proxiesHTTP MethodsWeb FrameworkStandard Request/Response HandlingRouter-level middlewareAPI OverrideRequest/response object modificationDebuggingReverse proxy supportHTTP RoutingApplication GeneratorStructured Error HandlingConfigurable Views DirectoryPrototype CustomizationProtocol detection via X-Forwarded-ProtoApplication-level middlewareConfigurable middlewareTypeScript ExtensionDatabase IntegrationNode.js inspector integrationDiagnostics channelsTypeScript SupportView RenderingRoute parametersModular route handlersClient IP address detectionStatic File ServingPromise-based middlewareTemplate Engine IntegrationThird-party middleware

Tags

Tags

MiddlewareWeb frameworkNode.jsJavaScriptTemplate EngineBackendProxyNode.js

Ways to use it

Ways to use it

npm

javascript / debug

sdk

javascript / https://expressjs.com/en/5x/api.html

npm

JavaScript / cassandra-driver

npm

JavaScript / couchbase

npm

JavaScript / nano

npm

javascript / express

npm

javascript / express

npm

javascript / pug

npm

javascript / @ladjs/consolidate

npm

JavaScript / express

npm

JavaScript / debug

sdk

javascript / @expressjs/v5-migration-recipe

npm

javascript / pug

npm

javascript / hbs

npm

javascript / @ladjs/consolidate

npm

JavaScript / express

npm

JavaScript / express

npm

javascript / debug

Product features

Product features

app.js

app.route() method

app.use accepts parameters

Changes in Express 4

Changes to Express core and middleware system

Set DEBUG in IDE

Configure DEBUG via env property in launch configurations such as VS Code.

Debug logging via DEBUG env var

Set DEBUG to express:*,router,router:* to see internal Express logs.

Application debug logging

Use the debug module with custom namespaces in your own app code.

Example app migration

express.Router class

Moving to Express 4

Node.js inspector support

Start with --inspect and attach Chrome DevTools or VS Code for breakpoints.

Other changes

package.json

The routing system

Version 3 app