diff --git a/packages/@ngtools/json-schema/src/serializers/json.spec.ts b/packages/@ngtools/json-schema/src/serializers/json.spec.ts
index ef6f36563dfb..bf8465161a21 100644
--- a/packages/@ngtools/json-schema/src/serializers/json.spec.ts
+++ b/packages/@ngtools/json-schema/src/serializers/json.spec.ts
@@ -7,26 +7,28 @@ import {RootSchemaTreeNode} from '../schema-tree';
 
 
 describe('JsonSerializer', () => {
-  const schemaJsonFilePath = path.join(__dirname, '../../tests/schema1.json');
-  const schemaJson = JSON.parse(fs.readFileSync(schemaJsonFilePath, 'utf-8'));
-  const valueJsonFilePath = path.join(__dirname, '../../tests/value1.json');
-  const valueJson = JSON.parse(fs.readFileSync(valueJsonFilePath, 'utf-8'));
-
-  const schemaClass = new (SchemaClassFactory(schemaJson))(valueJson);
-  const schema: RootSchemaTreeNode = schemaClass.$$schema();
-
-  it('works', () => {
-    let str = '';
-    function writer(s: string) {
-      str += s;
-    }
-
-    const serializer = new JsonSerializer(writer);
-
-    serializer.start();
-    schema.serialize(serializer);
-    serializer.end();
-
-    expect(JSON.stringify(JSON.parse(str))).toEqual(JSON.stringify(valueJson));
-  });
+  for (const nb of [1, 2, 3]) {
+    it(`works (${nb})`, () => {
+      const schemaJsonFilePath = path.join(__dirname, `../../tests/serializer/schema${nb}.json`);
+      const schemaJson = JSON.parse(fs.readFileSync(schemaJsonFilePath, 'utf-8'));
+      const valueJsonFilePath = path.join(__dirname, `../../tests/serializer/value${nb}.json`);
+      const valueJson = JSON.parse(fs.readFileSync(valueJsonFilePath, 'utf-8'));
+
+      const schemaClass = new (SchemaClassFactory(schemaJson))(valueJson);
+      const schema: RootSchemaTreeNode = schemaClass.$$schema();
+
+      let str = '';
+      function writer(s: string) {
+        str += s;
+      }
+
+      const serializer = new JsonSerializer(writer);
+
+      serializer.start();
+      schema.serialize(serializer);
+      serializer.end();
+
+      expect(JSON.stringify(JSON.parse(str))).toEqual(JSON.stringify(valueJson));
+    });
+  }
 });
diff --git a/packages/@ngtools/json-schema/src/serializers/json.ts b/packages/@ngtools/json-schema/src/serializers/json.ts
index 1ab57575ffd7..156778088db3 100644
--- a/packages/@ngtools/json-schema/src/serializers/json.ts
+++ b/packages/@ngtools/json-schema/src/serializers/json.ts
@@ -77,7 +77,7 @@ export class JsonSerializer implements Serializer {
         this._willOutputValue();
         this._writer(JSON.stringify(key));
         this._writer(': ');
-        this._writer(JSON.stringify(node.value));
+        this._writer(JSON.stringify(node.value[key]));
       }
     }
 
diff --git a/packages/@ngtools/json-schema/tests/serializer/schema1.json b/packages/@ngtools/json-schema/tests/serializer/schema1.json
new file mode 100644
index 000000000000..983feceb8bcd
--- /dev/null
+++ b/packages/@ngtools/json-schema/tests/serializer/schema1.json
@@ -0,0 +1,84 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "id": "JsonSchema",
+  "type": "object",
+  "properties": {
+    "requiredKey": {
+      "type": "number"
+    },
+    "stringKeyDefault": {
+      "type": "string",
+      "default": "defaultValue"
+    },
+    "stringKey": {
+      "type": "string"
+    },
+    "booleanKey": {
+      "type": "boolean"
+    },
+    "numberKey": {
+      "type": "number"
+    },
+    "oneOfKey1": {
+      "oneOf": [
+        { "type": "string" },
+        { "type": "number" }
+      ]
+    },
+    "oneOfKey2": {
+      "oneOf": [
+        { "type": "string" },
+        { "type": "array", "items": { "type": "string" } }
+      ]
+    },
+    "objectKey1": {
+      "type": "object",
+      "properties": {
+        "stringKey": {
+          "type": "string"
+        },
+        "objectKey": {
+          "type": "object",
+          "properties": {
+            "stringKey": {
+              "type": "string"
+            }
+          }
+        }
+      }
+    },
+    "objectKey2": {
+      "type": "object",
+      "properties": {
+        "stringKey": {
+          "type": "string",
+          "default": "default objectKey2.stringKey"
+        }
+      },
+      "additionalProperties": true
+    },
+    "arrayKey1": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "stringKey": {
+            "type": "string"
+          }
+        }
+      }
+    },
+    "arrayKey2": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "stringKey": {
+            "type": "string"
+          }
+        }
+      }
+    }
+  },
+  "required": ["requiredKey"]
+}
\ No newline at end of file
diff --git a/packages/@ngtools/json-schema/tests/serializer/schema2.json b/packages/@ngtools/json-schema/tests/serializer/schema2.json
new file mode 100644
index 000000000000..8afa29a93b42
--- /dev/null
+++ b/packages/@ngtools/json-schema/tests/serializer/schema2.json
@@ -0,0 +1,13 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "id": "JsonSchema",
+  "type": "object",
+  "properties": {
+    "a": {
+      "type": "array",
+      "items": {
+        "enum": [ "v1", "v2", "v3" ]
+      }
+    }
+  }
+}
diff --git a/packages/@ngtools/json-schema/tests/serializer/schema3.json b/packages/@ngtools/json-schema/tests/serializer/schema3.json
new file mode 100644
index 000000000000..c8626d1aac1d
--- /dev/null
+++ b/packages/@ngtools/json-schema/tests/serializer/schema3.json
@@ -0,0 +1,237 @@
+{
+  "$comment": "Please run `npm run build-config-interface` after changing this file. Thanks!",
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "id": "CliConfig",
+  "title": "Angular CLI Config Schema",
+  "type": "object",
+  "properties": {
+    "project": {
+      "description": "The global configuration of the project.",
+      "type": "object",
+      "properties": {
+        "version": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": false
+    },
+    "apps": {
+      "description": "Properties of the different applications in this project.",
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "root": {
+            "type": "string"
+          },
+          "outDir": {
+            "type": "string",
+            "default": "dist/"
+          },
+          "assets": {
+            "oneOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "array",
+                "items": {
+                  "type": "string"
+                }
+              }
+            ],
+            "default": []
+          },
+          "deployUrl": {
+            "type": "string"
+          },
+          "index": {
+            "type": "string",
+            "default": "index.html"
+          },
+          "main": {
+            "type": "string"
+          },
+          "test": {
+            "type": "string"
+          },
+          "tsconfig": {
+            "type": "string",
+            "default": "tsconfig.json"
+          },
+          "prefix": {
+            "type": "string"
+          },
+          "mobile": {
+            "type": "boolean"
+          },
+          "styles": {
+            "description": "Global styles to be included in the build.",
+            "type": "array",
+            "items": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "object",
+                  "properties": {
+                    "input": {
+                      "type": "string"
+                    }
+                  },
+                  "additionalProperties": true
+                }
+              ]
+            },
+            "additionalProperties": false
+          },
+          "scripts": {
+            "description": "Global scripts to be included in the build.",
+            "type": "array",
+            "items": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "object",
+                  "properties": {
+                    "input": {
+                      "type": "string"
+                    }
+                  },
+                  "additionalProperties": true,
+                  "required": ["input"]
+                }
+              ]
+            },
+            "additionalProperties": false
+          },
+          "environments": {
+            "description": "Name and corresponding file for environment config.",
+            "type": "object",
+            "additionalProperties": true
+          }
+        },
+        "additionalProperties": false
+      },
+      "additionalProperties": false
+    },
+    "addons": {
+      "description": "Configuration reserved for installed third party addons.",
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {},
+        "additionalProperties": true
+      }
+    },
+    "packages": {
+      "description": "Configuration reserved for installed third party packages.",
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {},
+        "additionalProperties": true
+      }
+    },
+    "e2e": {
+      "type": "object",
+      "properties": {
+        "protractor": {
+          "type": "object",
+          "properties": {
+            "config": {
+              "type": "string"
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    "test": {
+      "type": "object",
+      "properties": {
+        "karma": {
+          "type": "object",
+          "properties": {
+            "config": {
+              "type": "string"
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    "defaults": {
+      "type": "object",
+      "properties": {
+        "styleExt": {
+          "type": "string"
+        },
+        "prefixInterfaces": {
+          "type": "boolean"
+        },
+        "poll": {
+          "type": "number"
+        },
+        "viewEncapsulation": {
+          "type": "string"
+        },
+        "changeDetection": {
+          "type": "string"
+        },
+        "inline": {
+          "type": "object",
+          "properties": {
+            "style": {
+              "type": "boolean",
+              "default": false
+            },
+            "template": {
+              "type": "boolean",
+              "default": false
+            }
+          }
+        },
+        "spec": {
+          "type": "object",
+          "properties": {
+            "class": {
+              "type": "boolean",
+              "default": false
+            },
+            "component": {
+              "type": "boolean",
+              "default": true
+            },
+            "directive": {
+              "type": "boolean",
+              "default": true
+            },
+            "module": {
+              "type": "boolean",
+              "default": false
+            },
+            "pipe": {
+              "type": "boolean",
+              "default": true
+            },
+            "service": {
+              "type": "boolean",
+              "default": true
+            }
+          }
+        }
+      },
+      "additionalProperties": false
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/packages/@ngtools/json-schema/tests/serializer/value1.json b/packages/@ngtools/json-schema/tests/serializer/value1.json
new file mode 100644
index 000000000000..31f049534148
--- /dev/null
+++ b/packages/@ngtools/json-schema/tests/serializer/value1.json
@@ -0,0 +1,7 @@
+{
+  "requiredKey": 1,
+  "arrayKey2": [
+    { "stringKey": "value1" },
+    { "stringKey": "value2" }
+  ]
+}
\ No newline at end of file
diff --git a/packages/@ngtools/json-schema/tests/serializer/value2.json b/packages/@ngtools/json-schema/tests/serializer/value2.json
new file mode 100644
index 000000000000..d464dcc68e46
--- /dev/null
+++ b/packages/@ngtools/json-schema/tests/serializer/value2.json
@@ -0,0 +1,8 @@
+{
+  "a": [
+    null,
+    "v1",
+    null,
+    "v3"
+  ]
+}
diff --git a/packages/@ngtools/json-schema/tests/serializer/value3.json b/packages/@ngtools/json-schema/tests/serializer/value3.json
new file mode 100644
index 000000000000..8d79f3fc30f3
--- /dev/null
+++ b/packages/@ngtools/json-schema/tests/serializer/value3.json
@@ -0,0 +1,57 @@
+{
+  "project": {
+    "version": "<%= version %>",
+    "name": "<%= htmlComponentName %>"
+  },
+  "apps": [
+    {
+      "root": "<%= sourceDir %>",
+      "outDir": "dist",
+      "assets": [
+        "assets",
+        "favicon.ico"
+      ],
+      "index": "index.html",
+      "main": "main.ts",
+      "test": "test.ts",
+      "tsconfig": "tsconfig.json",
+      "prefix": "<%= prefix %>",
+      "mobile": true,
+      "styles": [
+        "styles.<%= styleExt %>"
+      ],
+      "scripts": [],
+      "environments": {
+        "source": "environments/environment.ts",
+        "dev": "environments/environment.ts",
+        "prod": "environments/environment.prod.ts"
+      }
+    }
+  ],
+  "e2e": {
+    "protractor": {
+      "config": "./protractor.conf.js"
+    }
+  },
+  "test": {
+    "karma": {
+      "config": "./karma.conf.js"
+    }
+  },
+  "defaults": {
+    "styleExt": "<%= styleExt %>",
+    "prefixInterfaces": false,
+    "inline": {
+      "style": false,
+      "template": false
+    },
+    "spec": {
+      "class": false,
+      "component": true,
+      "directive": false,
+      "module": false,
+      "pipe": true,
+      "service": false
+    }
+  }
+}