diff --git a/Library/Homebrew/test/cask/cask_spec.rb b/Library/Homebrew/test/cask/cask_spec.rb
index 6927a656ca..eb90f5090c 100644
--- a/Library/Homebrew/test/cask/cask_spec.rb
+++ b/Library/Homebrew/test/cask/cask_spec.rb
@@ -41,6 +41,12 @@ describe Cask::Cask, :cask do
       expect(c.token).to eq("local-caffeine")
     end
 
+    it "returns an instance of the Cask from a JSON file" do
+      c = Cask::CaskLoader.load("#{tap_path}/caffeine.json")
+      expect(c).to be_a(described_class)
+      expect(c.token).to eq("caffeine")
+    end
+
     it "returns an instance of the Cask from a URL" do
       c = Cask::CaskLoader.load("file://#{tap_path}/Casks/local-caffeine.rb")
       expect(c).to be_a(described_class)
@@ -49,9 +55,7 @@ describe Cask::Cask, :cask do
 
     it "raises an error when failing to download a Cask from a URL" do
       expect {
-        url = "file://#{tap_path}/Casks/notacask.rb"
-
-        Cask::CaskLoader.load(url)
+        Cask::CaskLoader.load("file://#{tap_path}/Casks/notacask.rb")
       }.to raise_error(Cask::CaskUnavailableError)
     end
 
@@ -212,6 +216,33 @@ describe Cask::Cask, :cask do
     end
   end
 
+  describe "#to_h" do
+    let(:json_file) { "#{TEST_FIXTURE_DIR}/cask/everything.json" }
+    let(:expected_json) { File.read(json_file).strip }
+
+    context "when loaded from cask file" do
+      it "returns expected hash" do
+        hash = Cask::CaskLoader.load("everything").to_h
+
+        expect(hash).to be_a(Hash)
+        expect(JSON.pretty_generate(hash)).to eq(expected_json)
+      end
+    end
+
+    context "when loaded from json file" do
+      it "returns expected hash" do
+        expect(Homebrew::API::Cask).not_to receive(:fetch_source)
+        hash = Cask::CaskLoader::FromAPILoader
+          .new("everything", from_json: JSON.parse(expected_json))
+          .load(config: nil)
+          .to_h
+
+        expect(hash).to be_a(Hash)
+        expect(JSON.pretty_generate(hash)).to eq(expected_json)
+      end
+    end
+  end
+
   describe "#to_hash_with_variations" do
     let!(:original_macos_version) { MacOS.full_version.to_s }
     let(:expected_versions_variations) {
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/everything.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/everything.rb
new file mode 100644
index 0000000000..b253c3d787
--- /dev/null
+++ b/Library/Homebrew/test/support/fixtures/cask/Casks/everything.rb
@@ -0,0 +1,48 @@
+# Used to test cask hash generation.
+cask "everything" do
+  version "1.2.3"
+
+  language "en", default: true do
+    sha256 "c64c05bdc0be845505d6e55e69e696a7f50d40846e76155f0c85d5ff5e7bbb84"
+    "en-US"
+  end
+  language "eo" do
+    sha256 "e8ffa07370a7fb7e1696b04c269e01d3459725965a32facdd54629a95d148908"
+    "eo"
+  end
+
+  url "https://cachefly.everything.app/releases/Everything_#{version}.zip",
+      user_agent: :fake,
+      cookies:    { "ALL" => "1234" }
+  name "Everything"
+  desc "Little bit of everything"
+  homepage "https://www.everything.app/"
+
+  auto_updates true
+  conflicts_with formula: "nothing"
+  depends_on cask: "something"
+  container type: :naked
+
+  app "Everything.app"
+  installer script: {
+    executable:   "~/just/another/path/install.sh",
+    args:         ["--mode=silent"],
+    sudo:         true,
+    print_stderr: false,
+  }
+
+  uninstall launchctl: "com.every.thing.agent",
+            delete:    ["/Library/EverythingHelperTools"],
+            kext:      "com.every.thing.driver",
+            signal:    [
+              ["TERM", "com.every.thing.controller#{version.major}"],
+              ["TERM", "com.every.thing.bin"],
+            ]
+
+  zap trash: [
+    "~/.everything",
+    "~/Library/Everything",
+  ]
+
+  caveats "Installing everything might take a while..."
+end
diff --git a/Library/Homebrew/test/support/fixtures/cask/caffeine.json b/Library/Homebrew/test/support/fixtures/cask/caffeine.json
new file mode 100644
index 0000000000..0907739b63
--- /dev/null
+++ b/Library/Homebrew/test/support/fixtures/cask/caffeine.json
@@ -0,0 +1,42 @@
+{
+  "token": "caffeine",
+  "full_token": "caffeine",
+  "tap": null,
+  "name": [
+
+  ],
+  "desc": null,
+  "homepage": "https://brew.sh/",
+  "url": "https://www.example.com/cask/caffeine.zip",
+  "appcast": null,
+  "version": "1.2.3",
+  "versions": {
+  },
+  "installed": null,
+  "outdated": false,
+  "sha256": "67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94",
+  "artifacts": [
+    {
+      "app": [
+        "Caffeine.app"
+      ]
+    },
+    {
+      "zap": [
+        {
+          "trash": "/$HOME/support/fixtures/cask/caffeine/org.example.caffeine.plist"
+        }
+      ]
+    }
+  ],
+  "caveats": null,
+  "depends_on": {
+  },
+  "conflicts_with": null,
+  "container": null,
+  "auto_updates": null,
+  "tap_git_head": null,
+  "languages": [
+
+  ]
+}
diff --git a/Library/Homebrew/test/support/fixtures/cask/everything.json b/Library/Homebrew/test/support/fixtures/cask/everything.json
new file mode 100644
index 0000000000..9ac6b3d522
--- /dev/null
+++ b/Library/Homebrew/test/support/fixtures/cask/everything.json
@@ -0,0 +1,99 @@
+{
+  "token": "everything",
+  "full_token": "everything",
+  "tap": "homebrew/cask",
+  "name": [
+    "Everything"
+  ],
+  "desc": "Little bit of everything",
+  "homepage": "https://www.everything.app/",
+  "url": "https://cachefly.everything.app/releases/Everything_1.2.3.zip",
+  "url_specs": {
+    "cookies": {
+      "ALL": "1234"
+    },
+    "user_agent": ":fake"
+  },
+  "appcast": null,
+  "version": "1.2.3",
+  "versions": {
+  },
+  "installed": null,
+  "outdated": false,
+  "sha256": "c64c05bdc0be845505d6e55e69e696a7f50d40846e76155f0c85d5ff5e7bbb84",
+  "artifacts": [
+    {
+      "uninstall": [
+        {
+          "launchctl": "com.every.thing.agent",
+          "delete": [
+            "/Library/EverythingHelperTools"
+          ],
+          "kext": "com.every.thing.driver",
+          "signal": [
+            [
+              "TERM",
+              "com.every.thing.controller1"
+            ],
+            [
+              "TERM",
+              "com.every.thing.bin"
+            ]
+          ]
+        }
+      ]
+    },
+    {
+      "installer": [
+        {
+          "script": {
+            "executable": "~/just/another/path/install.sh",
+            "args": [
+              "--mode=silent"
+            ],
+            "sudo": true,
+            "print_stderr": false
+          }
+        }
+      ]
+    },
+    {
+      "app": [
+        "Everything.app"
+      ]
+    },
+    {
+      "zap": [
+        {
+          "trash": [
+            "~/.everything",
+            "~/Library/Everything"
+          ]
+        }
+      ]
+    }
+  ],
+  "caveats": "Installing everything might take a while...\n\neverything requires a kernel extension to work.\nIf the installation fails, retry after you enable it in:\n  System Preferences → Security & Privacy → General\n\nFor more information, refer to vendor documentation or this Apple Technical Note:\n  https://developer.apple.com/library/content/technotes/tn2459/_index.html\n",
+  "depends_on": {
+    "cask": [
+      "something"
+    ]
+  },
+  "conflicts_with": {
+    "formula": [
+      "nothing"
+    ]
+  },
+  "container": {
+    "type": "naked"
+  },
+  "auto_updates": true,
+  "tap_git_head": null,
+  "languages": [
+    "en",
+    "eo"
+  ],
+  "ruby_source_checksum": {
+    "sha256": "b2707d1952f02c3fa566b7ad2a707a847a959d36f51d3dee642dbe5deec12f27"
+  }
+}