📅 Compatibility Dates

• Compatibility Dates ReferenceOpen external link

​Compatibility Dates

Miniflare uses compatibility dates to opt-into backwards-incompatible changes from a specific date. If one isn't set, it will default to some time far in the past.

const mf = new Miniflare({
  compatibilityDate: "2021-11-12",
});

​Compatibility Flags

Miniflare also lets you opt-in/out of specific changes using compatibility flags:

const mf = new Miniflare({
  compatibilityFlags: [
    "formdata_parser_supports_files",
    "durable_object_fetch_allows_relative_url",
  ],
});