The applies a static website configuration to a bucket named my-bucket:

aws s3api put-bucket-website --bucket my-bucket --website-configuration file://website.json

The file website.json is a JSON document in the current folder that specifies index and error pages for the website:

{
    "IndexDocument": {
        "Suffix": "index.html"
    },
    "ErrorDocument": {
        "Key": "error.html"
    }
}