diff --git a/extensions/json-language-features/client/src/jsonClient.ts b/extensions/json-language-features/client/src/jsonClient.ts
index f49bcac2fd5..15054d499e7 100644
--- a/extensions/json-language-features/client/src/jsonClient.ts
+++ b/extensions/json-language-features/client/src/jsonClient.ts
@@ -13,6 +13,7 @@ import {
 } from 'vscode';
 import {
 	LanguageClientOptions, RequestType, NotificationType, FormattingOptions as LSPFormattingOptions, DocumentDiagnosticReportKind,
+	Diagnostic as LSPDiagnostic,
 	DidChangeConfigurationNotification, HandleDiagnosticsSignature, ResponseError, DocumentRangeFormattingParams,
 	DocumentRangeFormattingRequest, ProvideCompletionItemsSignature, ProvideHoverSignature, BaseLanguageClient, ProvideFoldingRangeSignature, ProvideDocumentSymbolsSignature, ProvideDocumentColorsSignature
 } from 'vscode-languageclient';
@@ -38,6 +39,9 @@ namespace LanguageStatusRequest {
 	export const type: RequestType<string, JSONLanguageStatus, any> = new RequestType('json/languageStatus');
 }
 
+namespace ValidateContentRequest {
+	export const type: RequestType<{ schemaUri: string; content: string }, LSPDiagnostic[], any> = new RequestType('json/validateContent');
+}
 interface SortOptions extends LSPFormattingOptions {
 }
 
@@ -211,6 +215,10 @@ async function startClientWithParticipants(_context: ExtensionContext, languageP
 		window.showInformationMessage(l10n.t('JSON schema cache cleared.'));
 	}));
 
+	toDispose.push(commands.registerCommand('json.validate', async (schemaUri: Uri, content: string) => {
+		const diagnostics: LSPDiagnostic[] = await client.sendRequest(ValidateContentRequest.type, { schemaUri: schemaUri.toString(), content });
+		return diagnostics.map(client.protocol2CodeConverter.asDiagnostic);
+	}));
 
 	toDispose.push(commands.registerCommand('json.sort', async () => {
 
@@ -767,3 +775,5 @@ function updateMarkdownString(h: MarkdownString): MarkdownString {
 function isSchemaResolveError(d: Diagnostic) {
 	return d.code === /* SchemaResolveError */ 0x300;
 }
+
+
diff --git a/extensions/json-language-features/package.json b/extensions/json-language-features/package.json
index dc3b6a69219..375afed0ce6 100644
--- a/extensions/json-language-features/package.json
+++ b/extensions/json-language-features/package.json
@@ -16,7 +16,8 @@
   "activationEvents": [
     "onLanguage:json",
     "onLanguage:jsonc",
-    "onLanguage:snippets"
+    "onLanguage:snippets",
+    "onCommand:json.validate"
   ],
   "main": "./client/out/node/jsonClientMain",
   "browser": "./client/dist/browser/jsonClientMain",
diff --git a/extensions/json-language-features/server/src/jsonServer.ts b/extensions/json-language-features/server/src/jsonServer.ts
index 36ca0dc591d..6a806b72df6 100644
--- a/extensions/json-language-features/server/src/jsonServer.ts
+++ b/extensions/json-language-features/server/src/jsonServer.ts
@@ -40,6 +40,10 @@ namespace LanguageStatusRequest {
 	export const type: RequestType<string, JSONLanguageStatus, any> = new RequestType('json/languageStatus');
 }
 
+namespace ValidateContentRequest {
+	export const type: RequestType<{ schemaUri: string; content: string }, Diagnostic[], any> = new RequestType('json/validateContent');
+}
+
 export interface DocumentSortingParams {
 	/**
 	 * The uri of the document to sort.
@@ -299,6 +303,14 @@ export function startServer(connection: Connection, runtime: RuntimeEnvironment)
 		return [];
 	});
 
+	connection.onRequest(ValidateContentRequest.type, async ({ schemaUri, content }) => {
+		const docURI = 'vscode://schemas/temp/' + new Date().getTime();
+		const document = TextDocument.create(docURI, 'json', 1, content);
+		updateConfiguration([{ uri: schemaUri, fileMatch: [docURI] }]);
+		return await validateTextDocument(document);
+	});
+
+
 	connection.onRequest(LanguageStatusRequest.type, async uri => {
 		const document = documents.get(uri);
 		if (document) {
@@ -319,7 +331,7 @@ export function startServer(connection: Connection, runtime: RuntimeEnvironment)
 		return [];
 	});
 
-	function updateConfiguration() {
+	function updateConfiguration(extraSchemas?: SchemaConfiguration[]) {
 		const languageSettings = {
 			validate: validateEnabled,
 			allowComments: true,
@@ -350,6 +362,10 @@ export function startServer(connection: Connection, runtime: RuntimeEnvironment)
 				}
 			});
 		}
+		if (extraSchemas) {
+			languageSettings.schemas.push(...extraSchemas);
+		}
+
 		languageService.configure(languageSettings);
 
 		diagnosticsSupport?.requestRefresh();
@@ -529,3 +545,7 @@ export function startServer(connection: Connection, runtime: RuntimeEnvironment)
 function getFullRange(document: TextDocument): Range {
 	return Range.create(Position.create(0, 0), document.positionAt(document.getText().length));
 }
+
+
+
+