diff --git src/wp-includes/js/wp-api.js src/wp-includes/js/wp-api.js
index 31886d280b..e3c3dc7a4d 100644
--- src/wp-includes/js/wp-api.js
+++ src/wp-includes/js/wp-api.js
@@ -501,9 +501,50 @@
 			 * Add a helper function to handle post Meta.
 			 */
 			MetaMixin = {
-				getMeta: function() {
-					return buildCollectionGetter( this, 'PostMeta', 'https://api.w.org/meta' );
-				}
+
+				/**
+				 * Get meta by key for a post.
+				 *
+				 * @param {string} key The meta key.
+				 *
+				 * @return {object} The post meta value.
+				 */
+				getMeta: function( key ) {
+					var metas = this.get( 'meta' );
+					return metas[ key ];
+				},
+
+				/**
+				 * Get all meta key/values for a post.
+				 *
+				 * @return {object} The post metas, as a key value pair object.
+				 */
+				getMetas: function() {
+					return this.get( 'meta' );
+				},
+
+				/**
+				 * Set a group of meta key/values for a post.
+				 *
+				 * @param {object} meta The post meta to set, as key/value pairs.
+				 */
+				setMetas: function( meta ) {
+					var metas = this.get( 'meta' );
+					_.extend( metas, meta );
+					this.set( 'meta', metas );
+				},
+
+				/**
+				 * Set a single meta value for a post, by key.
+				 *
+				 * @param {string} key   The meta key.
+				 * @param {object} value The meta value.
+				 */
+				setMeta: function( key, value ) {
+					var metas = this.get( 'meta' );
+					metas[ key ] = value;
+					this.set( 'meta', metas );
+				},
 			},
 
 			/**
@@ -734,8 +775,8 @@
 			model = model.extend( CategoriesMixin );
 		}
 
-		// Add the MetaMixin for models that support meta collections.
-		if ( ! _.isUndefined( loadingObjects.collections[ modelClassName + 'Meta' ] ) ) {
+		// Add the MetaMixin for models that support meta.
+		if ( ! _.isUndefined( model.prototype.args.meta ) ) {
 			model = model.extend( MetaMixin );
 		}
 
diff --git tests/phpunit/tests/rest-api/rest-schema-setup.php tests/phpunit/tests/rest-api/rest-schema-setup.php
index 078232328e..6f652b0d3e 100644
--- tests/phpunit/tests/rest-api/rest-schema-setup.php
+++ tests/phpunit/tests/rest-api/rest-schema-setup.php
@@ -145,6 +145,16 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 			'post_excerpt'   => 'REST API Client Fixture: Post',
 			'post_author'    => 0,
 		) );
+		$args = array(
+			'sanitize_callback' => 'sanitize_my_meta_key',
+			'auth_callback'     => '__return_true',
+			'type'              => 'string',
+			'description'       => 'Test meta key',
+			'single'            => true,
+			'show_in_rest'      => true,
+		);
+		register_meta( 'post', 'meta_key', $args );
+		update_post_meta( $post_id, 'meta_key', 'meta_value' );
 		wp_update_post( array(
 			'ID'           => $post_id,
 			'post_content' => 'Updated post content.',
diff --git tests/qunit/fixtures/wp-api-generated.js tests/qunit/fixtures/wp-api-generated.js
index 679d024598..aae96457c1 100644
--- tests/qunit/fixtures/wp-api-generated.js
+++ tests/qunit/fixtures/wp-api-generated.js
@@ -3560,7 +3560,9 @@ mockedApiResponse.PostsCollection = [
         "sticky": false,
         "template": "",
         "format": "standard",
-        "meta": [],
+        "meta": {
+            "meta_key": "meta_value"
+        },
         "categories": [
             1
         ],
@@ -3651,7 +3653,9 @@ mockedApiResponse.PostModel = {
     "sticky": false,
     "template": "",
     "format": "standard",
-    "meta": [],
+    "meta": {
+        "meta_key": "meta_value"
+    },
     "categories": [
         1
     ],
@@ -3745,7 +3749,9 @@ mockedApiResponse.PagesCollection = [
         "comment_status": "closed",
         "ping_status": "closed",
         "template": "",
-        "meta": [],
+        "meta": {
+            "meta_key": ""
+        },
         "_links": {
             "self": [
                 {
@@ -3820,7 +3826,9 @@ mockedApiResponse.PageModel = {
     "comment_status": "closed",
     "ping_status": "closed",
     "template": "",
-    "meta": []
+    "meta": {
+        "meta_key": ""
+    }
 };
 
 mockedApiResponse.pageRevisions = [
@@ -3899,7 +3907,9 @@ mockedApiResponse.MediaCollection = [
         "comment_status": "open",
         "ping_status": "closed",
         "template": "",
-        "meta": [],
+        "meta": {
+            "meta_key": ""
+        },
         "description": {
             "rendered": "<p class=\"attachment\"><!-- <a...><img.../></a> --></p>"
         },
@@ -3958,7 +3968,9 @@ mockedApiResponse.MediaModel = {
     "comment_status": "open",
     "ping_status": "closed",
     "template": "",
-    "meta": [],
+    "meta": {
+        "meta_key": ""
+    },
     "description": {
         "rendered": "<p class=\"attachment\"><!-- <a...><img.../></a> --></p>"
     },
diff --git tests/qunit/wp-includes/js/wp-api.js tests/qunit/wp-includes/js/wp-api.js
index e904ccaec8..eb31897e76 100644
--- tests/qunit/wp-includes/js/wp-api.js
+++ tests/qunit/wp-includes/js/wp-api.js
@@ -1,4 +1,4 @@
-/* global wp */
+/* global wp, JSON */
 ( function( QUnit ) {
 	module( 'wpapi' );
 
@@ -343,4 +343,33 @@
 		} );
 	});
 
+	// Test post meta.
+	wp.api.loadPromise.done( function() {
+		QUnit.test( 'Check meta support.' , function( assert ) {
+			var theModels = new wp.api.collections.Posts();
+
+			theModels.fetch().done( function() {
+
+				// Get the main endpoint.
+				var endpoint = theModels.at(0);
+
+				// Verify the meta object returned correctly from `getMetas()`.
+				assert.equal( JSON.stringify( endpoint.getMetas() ), '{"meta_key":"meta_value"}', 'Full meta key/values object should be readable.' );
+
+				// Verify single meta returned correctly from `getMeta()`
+				assert.equal( endpoint.getMeta( 'meta_key' ), 'meta_value', 'Single meta should be readable by key.' );
+
+				// Verify setting meta values with `setMetas()`.
+				endpoint.setMetas( { 'test_key':'test_value' } );
+				assert.equal( endpoint.getMeta( 'test_key' ), 'test_value', 'Multiple meta should be writable via setMetas.' );
+
+				// Verify setting a single meta value with `setMeta()`.
+				endpoint.setMeta( 'test_key2', 'test_value2' );
+				assert.equal( endpoint.getMeta( 'test_key2' ), 'test_value2', 'Single meta should be writable via setMeta.' );
+
+			} );
+		} );
+	} );
+
+
 } )( window.QUnit );