diff --git a/ui-ngx/src/app/core/auth/auth.models.ts b/ui-ngx/src/app/core/auth/auth.models.ts
index 33b84945aa..7e97cb7a13 100644
--- a/ui-ngx/src/app/core/auth/auth.models.ts
+++ b/ui-ngx/src/app/core/auth/auth.models.ts
@@ -21,6 +21,7 @@ export interface SysParamsState {
   allowedDashboardIds: string[];
   edgesSupportEnabled: boolean;
   hasRepository: boolean;
+  mvelEnabled: boolean;
 }
 
 export interface AuthPayload extends SysParamsState {
diff --git a/ui-ngx/src/app/core/auth/auth.reducer.ts b/ui-ngx/src/app/core/auth/auth.reducer.ts
index cace62660e..7408f29145 100644
--- a/ui-ngx/src/app/core/auth/auth.reducer.ts
+++ b/ui-ngx/src/app/core/auth/auth.reducer.ts
@@ -24,7 +24,8 @@ const emptyUserAuthState: AuthPayload = {
   forceFullscreen: false,
   allowedDashboardIds: [],
   edgesSupportEnabled: false,
-  hasRepository: false
+  hasRepository: false,
+  mvelEnabled: false
 };
 
 export const initialState: AuthState = {
diff --git a/ui-ngx/src/app/core/auth/auth.selectors.ts b/ui-ngx/src/app/core/auth/auth.selectors.ts
index 4a63dbcbed..f703d72f57 100644
--- a/ui-ngx/src/app/core/auth/auth.selectors.ts
+++ b/ui-ngx/src/app/core/auth/auth.selectors.ts
@@ -60,6 +60,11 @@ export const selectHasRepository = createSelector(
   (state: AuthState) => state.hasRepository
 );
 
+export const selectMvelEnabled = createSelector(
+  selectAuthState,
+  (state: AuthState) => state.mvelEnabled
+);
+
 export function getCurrentAuthState(store: Store<AppState>): AuthState {
   let state: AuthState;
   store.pipe(select(selectAuth), take(1)).subscribe(
diff --git a/ui-ngx/src/app/core/auth/auth.service.ts b/ui-ngx/src/app/core/auth/auth.service.ts
index 172e4d5ac9..2b54306e2c 100644
--- a/ui-ngx/src/app/core/auth/auth.service.ts
+++ b/ui-ngx/src/app/core/auth/auth.service.ts
@@ -478,11 +478,20 @@ export class AuthService {
     }
   }
 
+  private loadMvelEnabled(authUser: AuthUser): Observable<boolean> {
+    if (authUser.authority === Authority.TENANT_ADMIN) {
+      return this.http.get<boolean>('/api/ruleChain/mvelEnabled', defaultHttpOptions());
+    } else {
+      return of(false);
+    }
+  }
+
   private loadSystemParams(authPayload: AuthPayload): Observable<SysParamsState> {
     const sources = [this.loadIsUserTokenAccessEnabled(authPayload.authUser),
                      this.fetchAllowedDashboardIds(authPayload),
                      this.loadIsEdgesSupportEnabled(),
                      this.loadHasRepository(authPayload.authUser),
+                     this.loadMvelEnabled(authPayload.authUser),
                      this.timeService.loadMaxDatapointsLimit()];
     return forkJoin(sources)
       .pipe(map((data) => {
@@ -490,7 +499,8 @@ export class AuthService {
         const allowedDashboardIds: string[] = data[1] as string[];
         const edgesSupportEnabled: boolean = data[2] as boolean;
         const hasRepository: boolean = data[3] as boolean;
-        return {userTokenAccessEnabled, allowedDashboardIds, edgesSupportEnabled, hasRepository};
+        const mvelEnabled: boolean = data[4] as boolean;
+        return {userTokenAccessEnabled, allowedDashboardIds, edgesSupportEnabled, hasRepository, mvelEnabled};
       }, catchError((err) => {
         return of({});
       })));
diff --git a/ui-ngx/src/app/core/http/rule-chain.service.ts b/ui-ngx/src/app/core/http/rule-chain.service.ts
index 6b0f3c3f22..8fcb5ecc5c 100644
--- a/ui-ngx/src/app/core/http/rule-chain.service.ts
+++ b/ui-ngx/src/app/core/http/rule-chain.service.ts
@@ -31,7 +31,7 @@ import { ComponentDescriptorService } from './component-descriptor.service';
 import {
   IRuleNodeConfigurationComponent,
   LinkLabel,
-  RuleNodeComponentDescriptor, RuleNodeConfiguration,
+  RuleNodeComponentDescriptor, RuleNodeConfiguration, ScriptLanguage,
   TestScriptInputParams,
   TestScriptResult
 } from '@app/shared/models/rule-node.models';
@@ -170,8 +170,12 @@ export class RuleChainService {
     return this.http.get<DebugRuleNodeEventBody>(`/api/ruleNode/${ruleNodeId}/debugIn`, defaultHttpOptionsFromConfig(config));
   }
 
-  public testScript(inputParams: TestScriptInputParams, config?: RequestConfig): Observable<TestScriptResult> {
-    return this.http.post<TestScriptResult>('/api/ruleChain/testScript', inputParams, defaultHttpOptionsFromConfig(config));
+  public testScript(inputParams: TestScriptInputParams, scriptLang?: ScriptLanguage, config?: RequestConfig): Observable<TestScriptResult> {
+    let url = '/api/ruleChain/testScript';
+    if (scriptLang) {
+      url += `?scriptLang=${scriptLang}`;
+    }
+    return this.http.post<TestScriptResult>(url, inputParams, defaultHttpOptionsFromConfig(config));
   }
 
   private loadRuleNodeComponents(ruleChainType: RuleChainType, config?: RequestConfig): Observable<Array<RuleNodeComponentDescriptor>> {
diff --git a/ui-ngx/src/app/core/services/script/node-script-test.service.ts b/ui-ngx/src/app/core/services/script/node-script-test.service.ts
index 5dcdb192af..2aca503daa 100644
--- a/ui-ngx/src/app/core/services/script/node-script-test.service.ts
+++ b/ui-ngx/src/app/core/services/script/node-script-test.service.ts
@@ -24,6 +24,7 @@ import {
   NodeScriptTestDialogData
 } from '@shared/components/dialog/node-script-test-dialog.component';
 import { sortObjectKeys } from '@core/utils';
+import { ScriptLanguage } from '@shared/models/rule-node.models';
 
 @Injectable({
   providedIn: 'root'
@@ -35,7 +36,8 @@ export class NodeScriptTestService {
   }
 
   testNodeScript(script: string, scriptType: string, functionTitle: string,
-                 functionName: string, argNames: string[], ruleNodeId: string, helpId?: string): Observable<string> {
+                 functionName: string, argNames: string[], ruleNodeId: string, helpId?: string,
+                 scriptLang?: ScriptLanguage): Observable<string> {
     if (ruleNodeId) {
       return this.ruleChainService.getLatestRuleNodeDebugInput(ruleNodeId).pipe(
         switchMap((debugIn) => {
@@ -57,13 +59,14 @@ export class NodeScriptTestService {
       );
     } else {
       return this.openTestScriptDialog(script, scriptType, functionTitle,
-        functionName, argNames, null, null, null, helpId);
+        functionName, argNames, null, null, null, helpId, scriptLang);
     }
   }
 
   private openTestScriptDialog(script: string, scriptType: string,
                                functionTitle: string, functionName: string, argNames: string[],
-                               msg?: any, metadata?: {[key: string]: string}, msgType?: string, helpId?: string): Observable<string> {
+                               msg?: any, metadata?: {[key: string]: string}, msgType?: string, helpId?: string,
+                               scriptLang?: ScriptLanguage): Observable<string> {
     if (!msg) {
       msg = {
         temperature: 22.4,
@@ -95,7 +98,8 @@ export class NodeScriptTestService {
           script,
           scriptType,
           argNames,
-          helpId
+          helpId,
+          scriptLang
         }
       }).afterClosed();
   }
diff --git a/ui-ngx/src/app/shared/components/dialog/node-script-test-dialog.component.ts b/ui-ngx/src/app/shared/components/dialog/node-script-test-dialog.component.ts
index fd2f7cd976..542e108aaa 100644
--- a/ui-ngx/src/app/shared/components/dialog/node-script-test-dialog.component.ts
+++ b/ui-ngx/src/app/shared/components/dialog/node-script-test-dialog.component.ts
@@ -37,7 +37,7 @@ import { Router } from '@angular/router';
 import { DialogComponent } from '@shared/components/dialog.component';
 import { ContentType } from '@shared/models/constants';
 import { JsonContentComponent } from '@shared/components/json-content.component';
-import { TestScriptInputParams } from '@shared/models/rule-node.models';
+import { ScriptLanguage, TestScriptInputParams } from '@shared/models/rule-node.models';
 import { RuleChainService } from '@core/http/rule-chain.service';
 import { mergeMap } from 'rxjs/operators';
 import { ActionNotificationShow } from '@core/notification/notification.actions';
@@ -49,6 +49,7 @@ export interface NodeScriptTestDialogData {
   functionTitle: string;
   functionName: string;
   argNames: string[];
+  scriptLang?: ScriptLanguage;
   msg?: any;
   metadata?: {[key: string]: string};
   msgType?: string;
@@ -191,7 +192,8 @@ export class NodeScriptTestDialogComponent extends DialogComponent<NodeScriptTes
         metadata: this.nodeScriptTestFormGroup.get('metadata').value,
         script: this.nodeScriptTestFormGroup.get('script').value
       };
-      return this.ruleChainService.testScript(inputParams).pipe(
+      const scriptLang = this.data.scriptLang ? this.data.scriptLang : ScriptLanguage.JS;
+      return this.ruleChainService.testScript(inputParams, scriptLang).pipe(
         mergeMap((result) => {
           if (result.error) {
             this.store.dispatch(new ActionNotificationShow(
diff --git a/ui-ngx/src/app/shared/models/rule-node.models.ts b/ui-ngx/src/app/shared/models/rule-node.models.ts
index df8ea3ed87..2c5ccd3015 100644
--- a/ui-ngx/src/app/shared/models/rule-node.models.ts
+++ b/ui-ngx/src/app/shared/models/rule-node.models.ts
@@ -328,6 +328,11 @@ export interface FcRuleEdge extends FcEdge {
   labels?: string[];
 }
 
+export enum ScriptLanguage {
+  JS = 'JS',
+  MVEL = 'MVEL'
+}
+
 export interface TestScriptInputParams {
   script: string;
   scriptType: string;