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What is CORS ?

CORS Cross-Origin Resource Sharing

Do I need a cors proxy?​

In short,

  • NO: For your own backend
  • YES: If..
    • Your front end is a plugin that runs on top of other sites. (e.g. shopify, figma plugin)
    • You are accessign third party api (e.g. instagram, twitter) and the api server responds with limited CORS headers.

Okay, it seems I don't need cors proxy service, What can I do?​

If you're application is a general web app and you have control over the backend, here are some quick guides for each backend frameworks.

  • Express
  • Koa
  • Hapi
  • Fastify
  • NestJS
  • AWS Lambda