diff --git a/core/requires.js b/core/requires.js
index 1ce08dddcac..974db99fedc 100644
--- a/core/requires.js
+++ b/core/requires.js
@@ -83,5 +83,4 @@ goog.require('Blockly.zelos.Renderer');
 // Classic is the default theme.
 goog.require('Blockly.Themes.Classic');
 
-goog.require('Blockly.serialization.blocks');
-goog.require('Blockly.serialization.variables');
+goog.require('Blockly.serialization.workspaces');
diff --git a/core/serialization/blocks.js b/core/serialization/blocks.js
index 4ab79a3a45b..86a1bc33334 100644
--- a/core/serialization/blocks.js
+++ b/core/serialization/blocks.js
@@ -17,6 +17,8 @@ goog.module.declareLegacyNamespace();
 const Block = goog.requireType('Blockly.Block');
 // eslint-disable-next-line no-unused-vars
 const Connection = goog.requireType('Blockly.Connection');
+// eslint-disable-next-line no-unused-vars
+const Workspace = goog.requireType('Blockly.Workspace');
 const Xml = goog.require('Blockly.Xml');
 const inputTypes = goog.require('Blockly.inputTypes');
 
@@ -255,3 +257,14 @@ const saveConnection = function(connection) {
   }
   return state;
 };
+
+/**
+ * Loads the block represented by the given state into the given workspace.
+ * @param {!State} state The state of a block to deserialize into the workspace.
+ * @param {!Workspace} workspace The workspace to add the block to.
+ */
+// eslint-disable-next-line no-unused-vars
+const load = function(state, workspace) {
+  // Temporarily NOP while connecting things together.
+};
+exports.load = load;
diff --git a/core/serialization/serialization.js b/core/serialization/serialization.js
deleted file mode 100644
index c53a2eb6432..00000000000
--- a/core/serialization/serialization.js
+++ /dev/null
@@ -1,18 +0,0 @@
-/**
- * @license
- * Copyright 2021 Google LLC
- * SPDX-License-Identifier: Apache-2.0
- */
-
-/**
- * @fileoverview Contains top-level functions for serialization of the workspace
- *     to JavaScript objects.
- */
-'use strict';
-
-/**
- * The top level namespace for JavaScript Object serialization.
- * @namespace Blockly.serialization
- */
-goog.module('Blockly.serialization');
-goog.module.declareLegacyNamespace();
diff --git a/core/serialization/workspaces.js b/core/serialization/workspaces.js
new file mode 100644
index 00000000000..b4600f9879a
--- /dev/null
+++ b/core/serialization/workspaces.js
@@ -0,0 +1,80 @@
+/**
+ * @license
+ * Copyright 2021 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Contains top-level functions for serializing workspaces to
+ *     plain JavaScript objects.
+ */
+'use strict';
+
+goog.module('Blockly.serialization.workspaces');
+goog.module.declareLegacyNamespace();
+ 
+// eslint-disable-next-line no-unused-vars
+const Workspace = goog.require('Blockly.Workspace');
+const blocks = goog.require('Blockly.serialization.blocks');
+const variables = goog.require('Blockly.serialization.variables');
+ 
+
+/**
+ * Returns the state of the workspace as a plain JavaScript object.
+ * @param {!Workspace} workspace The workspace to serialize.
+ * @return {!Object<string, *>} The serialized state of the workspace.
+ */
+const save = function(workspace) {
+  const state = Object.create(null);
+
+  // TODO: Switch this to use plugin serialization system (once it is built).
+  const variableState = [];
+  const vars = workspace.getAllVariables();
+  for (let i = 0; i < vars.length; i++) {
+    variableState.push(variables.save(vars[i]));
+  }
+  if (variableState.length) {
+    state['variables'] = variableState;
+  }
+
+  const blockState = [];
+  for (let block of workspace.getTopBlocks(false)) {
+    blockState.push(
+        blocks.save(block, {addCoordinates: true}));
+  }
+  if (blockState.length) {
+    // This is an object to support adding language version later.
+    state['blocks'] = {
+      'blocks': blockState
+    };
+  }
+
+  return state;
+};
+exports.save = save;
+ 
+/**
+ * Loads the variable represented by the given state into the given workspace.
+ * @param {!Object<string, *>} state The state of the workspace to deserialize
+ *     into the workspace.
+ * @param {!Workspace} workspace The workspace to add the new state to.
+ */
+const load = function(state, workspace) {
+  // TODO: Switch this to use plugin serialization system (once it is built).
+  // TODO: Add something for clearing the state before deserializing.
+
+  if (state['variables']) {
+    const variableStates = state['variables'];
+    for (let i = 0; i < variableStates.length; i++) {
+      variables.load(variableStates[i], workspace);
+    }
+  }
+
+  if (state['blocks']) {
+    const blockStates = state['blocks']['blocks'];
+    for (let i = 0; i < blockStates.length; i++) {
+      blocks.load(blockStates[i], workspace);
+    }
+  }
+};
+exports.load = load;
diff --git a/tests/deps.js b/tests/deps.js
index 9dfa475c3df..6de793267bf 100644
--- a/tests/deps.js
+++ b/tests/deps.js
@@ -151,11 +151,11 @@ goog.addDependency('../../core/renderers/zelos/measurables/row_elements.js', ['B
 goog.addDependency('../../core/renderers/zelos/measurables/rows.js', ['Blockly.zelos.BottomRow', 'Blockly.zelos.TopRow'], ['Blockly.blockRendering.BottomRow', 'Blockly.blockRendering.TopRow', 'Blockly.utils.object']);
 goog.addDependency('../../core/renderers/zelos/path_object.js', ['Blockly.zelos.PathObject'], ['Blockly.blockRendering.PathObject', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.zelos.ConstantProvider']);
 goog.addDependency('../../core/renderers/zelos/renderer.js', ['Blockly.zelos.Renderer'], ['Blockly.InsertionMarkerManager', 'Blockly.blockRendering', 'Blockly.blockRendering.Renderer', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.utils.object', 'Blockly.zelos.ConstantProvider', 'Blockly.zelos.Drawer', 'Blockly.zelos.MarkerSvg', 'Blockly.zelos.PathObject', 'Blockly.zelos.RenderInfo']);
-goog.addDependency('../../core/requires.js', ['Blockly.requires'], ['Blockly', 'Blockly.Comment', 'Blockly.ContextMenuItems', 'Blockly.FieldAngle', 'Blockly.FieldCheckbox', 'Blockly.FieldColour', 'Blockly.FieldDropdown', 'Blockly.FieldImage', 'Blockly.FieldLabelSerializable', 'Blockly.FieldMultilineInput', 'Blockly.FieldNumber', 'Blockly.FieldTextInput', 'Blockly.FieldVariable', 'Blockly.FlyoutButton', 'Blockly.Generator', 'Blockly.HorizontalFlyout', 'Blockly.Mutator', 'Blockly.ShortcutItems', 'Blockly.Themes.Classic', 'Blockly.Toolbox', 'Blockly.Trashcan', 'Blockly.VariablesDynamic', 'Blockly.VerticalFlyout', 'Blockly.Warning', 'Blockly.ZoomControls', 'Blockly.geras.Renderer', 'Blockly.serialization.blocks', 'Blockly.serialization.variables', 'Blockly.thrasos.Renderer', 'Blockly.zelos.Renderer']);
+goog.addDependency('../../core/requires.js', ['Blockly.requires'], ['Blockly', 'Blockly.Comment', 'Blockly.ContextMenuItems', 'Blockly.FieldAngle', 'Blockly.FieldCheckbox', 'Blockly.FieldColour', 'Blockly.FieldDropdown', 'Blockly.FieldImage', 'Blockly.FieldLabelSerializable', 'Blockly.FieldMultilineInput', 'Blockly.FieldNumber', 'Blockly.FieldTextInput', 'Blockly.FieldVariable', 'Blockly.FlyoutButton', 'Blockly.Generator', 'Blockly.HorizontalFlyout', 'Blockly.Mutator', 'Blockly.ShortcutItems', 'Blockly.Themes.Classic', 'Blockly.Toolbox', 'Blockly.Trashcan', 'Blockly.VariablesDynamic', 'Blockly.VerticalFlyout', 'Blockly.Warning', 'Blockly.ZoomControls', 'Blockly.geras.Renderer', 'Blockly.serialization.workspaces', 'Blockly.thrasos.Renderer', 'Blockly.zelos.Renderer']);
 goog.addDependency('../../core/scrollbar.js', ['Blockly.Scrollbar', 'Blockly.ScrollbarPair'], ['Blockly.Events', 'Blockly.Touch', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Metrics', 'Blockly.utils.Svg', 'Blockly.utils.dom']);
 goog.addDependency('../../core/serialization/blocks.js', ['Blockly.serialization.blocks'], ['Blockly.Xml', 'Blockly.inputTypes'], {'lang': 'es6', 'module': 'goog'});
-goog.addDependency('../../core/serialization/serialization.js', ['Blockly.serialization'], [], {'module': 'goog'});
 goog.addDependency('../../core/serialization/variables.js', ['Blockly.serialization.variables'], [], {'lang': 'es6', 'module': 'goog'});
+goog.addDependency('../../core/serialization/workspaces.js', ['Blockly.serialization.workspaces'], ['Blockly.Workspace', 'Blockly.serialization.blocks', 'Blockly.serialization.variables'], {'lang': 'es6', 'module': 'goog'});
 goog.addDependency('../../core/shortcut_items.js', ['Blockly.ShortcutItems'], ['Blockly.Gesture', 'Blockly.ShortcutRegistry', 'Blockly.utils.KeyCodes']);
 goog.addDependency('../../core/shortcut_registry.js', ['Blockly.ShortcutRegistry'], ['Blockly.utils.KeyCodes', 'Blockly.utils.object']);
 goog.addDependency('../../core/theme.js', ['Blockly.Theme'], ['Blockly.registry', 'Blockly.utils', 'Blockly.utils.object']);
diff --git a/tests/mocha/serializer_test.js b/tests/mocha/serializer_test.js
index 8a77e704d71..8bd3e672d88 100644
--- a/tests/mocha/serializer_test.js
+++ b/tests/mocha/serializer_test.js
@@ -1726,14 +1726,16 @@ Serializer.testSuites = [
 ];
 
 var runSerializerTestSuite = (serializer, deserializer, testSuite) => {
+  const workspaces = Blockly.serialization.workspaces;
 
   const createTestFunction = function(test) {
     return function() {
       Blockly.Xml.domToWorkspace(
           Blockly.Xml.textToDom(test.xml), this.workspace);
       if (serializer && deserializer) {
-        // TODO: Add support for custom serializeers and deserializers.
-        //    Will be added once we have the JSO format working.
+        const save = serializer(workspaces.save(this.workspace));
+        this.workspace.clear();
+        workspaces.load(deserializer(save), this.workspace);
       }
       var newXml = Blockly.Xml.workspaceToDom(this.workspace);
       chai.assert.equal(Blockly.Xml.domToText(newXml), test.xml);
@@ -1766,3 +1768,5 @@ var runSerializerTestSuite = (serializer, deserializer, testSuite) => {
 };
 
 runSerializerTestSuite(null, null, Serializer);
+Serializer.skip = true;
+runSerializerTestSuite(state => state, state => state, Serializer);