expressjs/cors

Health v2 · maintenance only

Adoption not part of the score

6191 stars · 511 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A Node.js middleware for Express and Connect that sets CORS response headers, telling browsers which origins may read responses from your server. It supports simple usage, per-route enabling, dynamic origin configuration, and pre-flight handling.

Use cases

• enable cross-origin requests to my express api
• allow a browser frontend to call my nodejs server
• configure allowed origins for cors headers
• handle cors pre-flight options requests
• enable cors for a single route in express
• set dynamic origin per request in nodejs

When to choose

• you run an Express or Connect server and need browser cross-origin access
• you want configurable, per-route or dynamic CORS header handling
• you need a small, battle-tested middleware with simple npm install

When to avoid

• your server is not Node.js/Express/Connect
• you expect CORS to block requests - it only sets headers enforced by browsers
• non-browser clients are your only consumers, since they ignore CORS entirely

Facets

library · maturity stable

middleware http-server security web-framework web-development backend apis security cors express connect cross-origin-resource-sharing http-headers pre-flight nodejs web-server

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markdown · JSON · MCP: product_card(name="expressjs/cors")