Setting an open CORS policy on an S3 bucket Clark Wilkins, Simplexable 2022.01.18

I was working on implementing file uploads to S3 in a React project. One of the setup steps is to implement a cross-border CORS configuration. Here's how you get this done.

  1. Login to your S3 console.
  2. Go to the bucket.
  4. Select permissions.
  6. Scroll down to Cross-origin resource sharing (CORS).
  8. Click Edit and add this JSON array.

[
  {

    "AllowedHeaders": [

      "*"

    ],

    "AllowedMethods": [

       "GET",

       "HEAD",
       "PUT",

       "POST"

    ],

    "AllowedOrigins": [

       "*"

    ],

    "ExposeHeaders": [],

    "MaxAgeSeconds": 3000

  }

]

There's a good explanation of this here.