diff --git a/src/sql/workbench/contrib/notebook/test/common/jsonext.test.ts b/src/sql/workbench/contrib/notebook/test/common/jsonext.test.ts
new file mode 100644
index 0000000000..d3913fc8df
--- /dev/null
+++ b/src/sql/workbench/contrib/notebook/test/common/jsonext.test.ts
@@ -0,0 +1,42 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as assert from 'assert';
+import { isPrimitive } from 'sql/workbench/services/notebook/common/jsonext';
+
+suite('jsonext', function (): void {
+	test('Validate null object is primitive', async function (): Promise<void> {
+		let object = null;
+		assert.equal(isPrimitive(object), true, 'null object should be primitive');
+		object = undefined;
+		assert.equal(isPrimitive(object), false, 'undefined object should not be primitive');
+	});
+	test('Validate boolean types are primitive', async function (): Promise<void> {
+		let object: boolean = false;
+		assert.equal(isPrimitive(object), true, 'false boolean object should be primitive');
+		object = true;
+		assert.equal(isPrimitive(object), true, 'true boolean object should be primitive');
+	});
+	test('Validate number types are primitive', async function (): Promise<void> {
+		let object: number = 0;
+		assert.equal(isPrimitive(object), true, 'number with value 0 should be primitive');
+		object = 1;
+		assert.equal(isPrimitive(object), true, 'number with value 1 should be primitive');
+	});
+	test('Validate string types are primitive', async function (): Promise<void> {
+		let object: string = '';
+		assert.equal(isPrimitive(object), true, 'empty strings should be primitive');
+		object = 'nonempty string';
+		assert.equal(isPrimitive(object), true, 'non-empty strings should be primitive');
+	});
+	test('custom object is not primitive', async function (): Promise<void> {
+		let object = {
+			prop1: 'val1'
+		};
+		assert.equal(isPrimitive(object), false, 'custom object should not be primitive');
+		object = undefined;
+		assert.equal(isPrimitive(object), false, 'undefined object should not be primitive');
+	});
+});
diff --git a/src/sql/workbench/contrib/notebook/test/common/nbformat.test.ts b/src/sql/workbench/contrib/notebook/test/common/nbformat.test.ts
new file mode 100644
index 0000000000..d464a1ba6e
--- /dev/null
+++ b/src/sql/workbench/contrib/notebook/test/common/nbformat.test.ts
@@ -0,0 +1,58 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { nbformat } from 'sql/workbench/services/notebook/common/nbformat';
+import * as assert from 'assert';
+
+suite('nbformat', function (): void {
+	let sampleOutput: nbformat.IOutput = {
+		data: undefined,
+		ename: '',
+		evalue: undefined,
+		execution_count: 0,
+		name: undefined,
+		output_type: 'display_data'
+	};
+	test('Validate display_data Output Type', async function (): Promise<void> {
+		sampleOutput.output_type = 'display_data';
+		assert.equal(nbformat.isDisplayData(sampleOutput), true, 'display_data output type not recognized correctly');
+		assert.equal(nbformat.isDisplayUpdate(sampleOutput), false, 'update_display_data output type incorrectly recognized');
+		assert.equal(nbformat.isError(sampleOutput), false, 'error output type incorrectly recognized');
+		assert.equal(nbformat.isExecuteResult(sampleOutput), false, 'execute_result output type incorrectly recognized');
+		assert.equal(nbformat.isStream(sampleOutput), false, 'stream output type incorrectly recognized');
+	});
+	test('Validate update_display_data Output Type', async function (): Promise<void> {
+		sampleOutput.output_type = 'update_display_data';
+		assert.equal(nbformat.isDisplayData(sampleOutput), false, 'display_data output type incorrectly recognized');
+		assert.equal(nbformat.isDisplayUpdate(sampleOutput), true, 'update_display_data output type not recognized correctly');
+		assert.equal(nbformat.isError(sampleOutput), false, 'error output type incorrectly recognized');
+		assert.equal(nbformat.isExecuteResult(sampleOutput), false, 'execute_result output type incorrectly recognized');
+		assert.equal(nbformat.isStream(sampleOutput), false, 'stream output type incorrectly recognized');
+	});
+	test('Validate error Output Type', async function (): Promise<void> {
+		sampleOutput.output_type = 'error';
+		assert.equal(nbformat.isDisplayData(sampleOutput), false, 'display_data output type incorrectly recognized');
+		assert.equal(nbformat.isDisplayUpdate(sampleOutput), false, 'update_display_data output type incorrectly recognized');
+		assert.equal(nbformat.isError(sampleOutput), true, 'error output type not recognized correctly');
+		assert.equal(nbformat.isExecuteResult(sampleOutput), false, 'execute_result output type incorrectly recognized');
+		assert.equal(nbformat.isStream(sampleOutput), false, 'stream output type incorrectly recognized');
+	});
+	test('Validate execute_result Output Type', async function (): Promise<void> {
+		sampleOutput.output_type = 'execute_result';
+		assert.equal(nbformat.isDisplayData(sampleOutput), false, 'display_data output type incorrectly recognized');
+		assert.equal(nbformat.isDisplayUpdate(sampleOutput), false, 'update_display_data output type incorrectly recognized');
+		assert.equal(nbformat.isError(sampleOutput), false, 'error output type incorrectly recognized');
+		assert.equal(nbformat.isExecuteResult(sampleOutput), true, 'execute_result output type not recognized correctly');
+		assert.equal(nbformat.isStream(sampleOutput), false, 'stream output type incorrectly recognized');
+	});
+	test('Validate stream Output Type', async function (): Promise<void> {
+		sampleOutput.output_type = 'stream';
+		assert.equal(nbformat.isDisplayData(sampleOutput), false, 'display_data output type incorrectly recognized');
+		assert.equal(nbformat.isDisplayUpdate(sampleOutput), false, 'update_display_data output type incorrectly recognized');
+		assert.equal(nbformat.isError(sampleOutput), false, 'error output type incorrectly recognized');
+		assert.equal(nbformat.isExecuteResult(sampleOutput), false, 'execute_result output type incorrectly recognized');
+		assert.equal(nbformat.isStream(sampleOutput), true, 'stream output type not recognized correctly');
+	});
+});
diff --git a/src/sql/workbench/services/notebook/common/nbformat.ts b/src/sql/workbench/services/notebook/common/nbformat.ts
index 35d3f60603..d956fe2893 100644
--- a/src/sql/workbench/services/notebook/common/nbformat.ts
+++ b/src/sql/workbench/services/notebook/common/nbformat.ts
@@ -90,57 +90,6 @@ export namespace nbformat {
 	 */
 	export type OutputMetadata = JSONObject;
 
-	/**
-	 * Validate a mime type/value pair.
-	 *
-	 * @param type - The mimetype name.
-	 *
-	 * @param value - The value associated with the type.
-	 *
-	 * @returns Whether the type/value pair are valid.
-	 */
-	export function validateMimeValue(
-		type: string,
-		value: MultilineString | JSONObject
-	): boolean {
-		// Check if "application/json" or "application/foo+json"
-		const jsonTest = /^application\/(.*?)+\+json$/;
-		const isJSONType = type === 'application/json' || jsonTest.test(type);
-
-		let isString = (x: any) => {
-			return Object.prototype.toString.call(x) === '[object String]';
-		};
-
-		// If it is an array, make sure if is not a JSON type and it is an
-		// array of strings.
-		if (Array.isArray(value)) {
-			if (isJSONType) {
-				return false;
-			}
-			let valid = true;
-			(value as string[]).forEach(v => {
-				if (!isString(v)) {
-					valid = false;
-				}
-			});
-			return valid;
-		}
-
-		// If it is a string, make sure we are not a JSON type.
-		if (isString(value)) {
-			return !isJSONType;
-		}
-
-		// It is not a string, make sure it is a JSON type.
-		if (!isJSONType) {
-			return false;
-		}
-
-		// It is a JSON type, make sure it is a valid JSON object.
-		// return JSONExt.isObject(value);
-		return true;
-	}
-
 	/**
 	 * Cell-level metadata.
 	 */
@@ -282,27 +231,6 @@ export namespace nbformat {
 	 */
 	export type ICell = IRawCell | IMarkdownCell | ICodeCell | IUnrecognizedCell;
 
-	/**
-	 * Test whether a cell is a raw cell.
-	 */
-	export function isRaw(cell: ICell): cell is IRawCell {
-		return cell.cell_type === 'raw';
-	}
-
-	/**
-	 * Test whether a cell is a markdown cell.
-	 */
-	export function isMarkdown(cell: ICell): cell is IMarkdownCell {
-		return cell.cell_type === 'markdown';
-	}
-
-	/**
-	 * Test whether a cell is a code cell.
-	 */
-	export function isCode(cell: ICell): cell is ICodeCell {
-		return cell.cell_type === 'code';
-	}
-
 	/**
 	 * A union metadata type.
 	 */
@@ -487,8 +415,3 @@ export namespace nbformat {
 		| IStream
 		| IError;
 }
-
-export interface ICellOutputWithIdAndTrust extends nb.ICellOutput {
-	id: number;
-	trusted: boolean;
-}