cache option is no longer available ⚠️

This option is vulnerable to misuse and can therefore cause serious vulnerabilities in your application. If you want to use the Cache API in a more human way, please use the new Cache module.

Removed helper functions from c.res ⚠️

c.res.blob(), c.res.buffer(), c.res.formData(), c.res.json(), c.res.stream(), c.res.string(), and c.res.text() have been removed.

Please use one of the following approaches to set the body of the response.

  1. c.res.body

    app.get('/', (c) => {
      c.res.body = 'Hello World'
  2. return

    app.get('/', () => {
      return 'Hello World'

Removed support for TypeBox ⚠️

The validator/... namespace and the validator option are no longer available. zod is now used by default without any configuration required.

This change was made to simplify the internal code and allow for future flexibility.

New Extensions API ⚠️

Plugins are no longer available. Use the new extensions instead, e.g. helmet:

import cheetah from 'https://deno.land/x/cheetah/mod.ts'
import { helmet } from 'https://deno.land/x/cheetah/ext/helmet.ts'

const app = new cheetah()

For end users, this really only means a change in the import path. If you're the developer of a extension for cheetah, this change requires a total rewrite of it.

New way to retrieve environment variables ⚠️

If you're using cheetah for Cloudflare Workers, you now have to retrieve environment variables through the new env method.

import { env } from 'https://deno.land/x/cheetah/x/mod.ts'

app.get('/', (c) => {
  const { foo } = env<{ foo: string }>(c)

  // ...

Removed debug option ⚠️

The debug option is no longer available, instead you should use the debug extension.

No need for using app.fetch on Deno

The app.serve() function is the successor to Deno.serve(app.fetch).

While app.serve is specifically meant for Deno, app.fetch is now purely meant for Cloudflare Workers (& for our internal testing).

import cheetah from 'https://deno.land/x/cheetah/mod.ts'

const app = new cheetah()
  .get('/', () => 'Hello World')


Various new accessories

We've added various new accessories which should make it even easier for you to get started building something great.

  • Cache - the new alternative to the original cache option.
  • env - a cross-runtime module for retrieving environment variables (especially useful for Cloudflare Workers).
  • jsx - a module for responding with a JSX component.
  • LocationData - a typesafe module for retrieving geolocation data.

Various new extensions

As we've rewritten cheetah's Extensions API, we added several new extensions which might be pretty useful for you:

Insignificant Changes

  • You can now retrieve the size of the currently set response body with c.res.bodySize.

  • You now have the option to retrieve a set of all your routes with app.routes.

  • The type of c.req.method is now more strict.