diff --git a/Library/Homebrew/api.rb b/Library/Homebrew/api.rb
index df733d69dd..13a411987d 100644
--- a/Library/Homebrew/api.rb
+++ b/Library/Homebrew/api.rb
@@ -184,6 +184,13 @@ module Homebrew
 
       Tap.fetch(org, repo)
     end
+
+    sig { returns(T::Boolean) }
+    def self.internal_json_v3?
+      return @internal_json_v3 if defined?(@internal_json_v3)
+
+      @internal_json_v3 = ENV["HOMEBREW_INTERNAL_JSON_V3"].present?
+    end
   end
 
   # @api private
diff --git a/Library/Homebrew/api/formula.rb b/Library/Homebrew/api/formula.rb
index e9747c1ba4..d27e963eff 100644
--- a/Library/Homebrew/api/formula.rb
+++ b/Library/Homebrew/api/formula.rb
@@ -39,19 +39,24 @@ module Homebrew
 
       sig { returns(T::Boolean) }
       def self.download_and_cache_data!
-        json_formulae, updated = Homebrew::API.fetch_json_api_file "formula.jws.json"
+        if Homebrew::API.internal_json_v3?
+          json_formulae, updated = Homebrew::API.fetch_json_api_file "internal/v3/homebrew-core.jws.json"
+          overwrite_cache! T.cast(json_formulae, T::Hash[String, T.untyped])
+        else
+          json_formulae, updated = Homebrew::API.fetch_json_api_file "formula.jws.json"
 
-        cache["aliases"] = {}
-        cache["renames"] = {}
-        cache["formulae"] = json_formulae.to_h do |json_formula|
-          json_formula["aliases"].each do |alias_name|
-            cache["aliases"][alias_name] = json_formula["name"]
-          end
-          (json_formula["oldnames"] || [json_formula["oldname"]].compact).each do |oldname|
-            cache["renames"][oldname] = json_formula["name"]
-          end
+          cache["aliases"] = {}
+          cache["renames"] = {}
+          cache["formulae"] = json_formulae.to_h do |json_formula|
+            json_formula["aliases"].each do |alias_name|
+              cache["aliases"][alias_name] = json_formula["name"]
+            end
+            (json_formula["oldnames"] || [json_formula["oldname"]].compact).each do |oldname|
+              cache["renames"][oldname] = json_formula["name"]
+            end
 
-          [json_formula["name"], json_formula.except("name")]
+            [json_formula["name"], json_formula.except("name")]
+          end
         end
 
         updated
@@ -88,6 +93,28 @@ module Homebrew
         cache["renames"]
       end
 
+      sig { returns(Hash) }
+      def self.tap_migrations
+        # Not sure that we need to reload here.
+        unless cache.key?("tap_migrations")
+          json_updated = download_and_cache_data!
+          write_names_and_aliases(regenerate: json_updated)
+        end
+
+        cache["tap_migrations"]
+      end
+
+      sig { returns(String) }
+      def self.tap_git_head
+        # Note sure we need to reload here.
+        unless cache.key?("tap_git_head")
+          json_updated = download_and_cache_data!
+          write_names_and_aliases(regenerate: json_updated)
+        end
+
+        cache["tap_git_head"]
+      end
+
       sig { params(regenerate: T::Boolean).void }
       def self.write_names_and_aliases(regenerate: false)
         download_and_cache_data! unless cache.key?("formulae")
diff --git a/Library/Homebrew/extend/cachable.rb b/Library/Homebrew/extend/cachable.rb
index b124c638e6..785dff4c57 100644
--- a/Library/Homebrew/extend/cachable.rb
+++ b/Library/Homebrew/extend/cachable.rb
@@ -7,6 +7,11 @@ module Cachable
     @cache ||= T.let({}, T.nilable(T::Hash[T.untyped, T.untyped]))
   end
 
+  sig { params(hash: T.nilable(T::Hash[T.untyped, T.untyped])).void }
+  def overwrite_cache!(hash)
+    @cache = hash
+  end
+
   sig { void }
   def clear_cache
     cache.clear
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 60df907f12..568e155706 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -1101,6 +1101,8 @@ class CoreTap < AbstractCoreTap
     @tap_migrations ||= if Homebrew::EnvConfig.no_install_from_api?
       ensure_installed!
       super
+    elsif Homebrew::API.internal_json_v3?
+      Homebrew::API::Formula.tap_migrations
     else
       migrations, = Homebrew::API.fetch_json_api_file "formula_tap_migrations.jws.json",
                                                       stale_seconds: TAP_MIGRATIONS_STALE_SECONDS