jhipster · sumrender · Aug 26, 2025 · Aug 26, 2025
diff --git a/cli/cli-jdl.spec.ts b/cli/cli-jdl.spec.ts
@@ -12,7 +12,8 @@ describe('allows customizing JDL definitions', () => {
     await helpers
       .prepareTemporaryDir()
       .withFiles({
-        '.blueprint/app/index.mjs': `export const command = {
+        '.blueprint/package.json': JSON.stringify({ type: 'module' }),
+        '.blueprint/app/index.js': `export const command = {
   configs: {
     fooConfig: {
       jdl: {

diff --git a/cli/program.ts b/cli/program.ts
@@ -244,7 +244,7 @@ export const buildCommands = ({
       return command;
     } catch (error) {
       try {
-        const { default: command } = await import(`./${key}.mjs`);
+        const { default: command } = await import(`./${key}.cjs`);
         return command;
       } catch {
         throw error;

diff --git a/generators/angular/__snapshots__/generator.spec.ts.snap b/generators/angular/__snapshots__/generator.spec.ts.snap
@@ -20,7 +20,7 @@ exports[`generator - angular gateway-jwt-skipUserManagement(true)-withAdminUi(fa
   "clientRoot/angular.json": {
     "stateCleared": "modified",
   },
-  "clientRoot/eslint.config.mjs": {
+  "clientRoot/eslint.config.js": {
     "stateCleared": "modified",
   },
   "clientRoot/jest.conf.js": {
@@ -759,7 +759,7 @@ exports[`generator - angular gateway-oauth2-withAdminUi(true)-skipJhipsterDepend
   "clientRoot/angular.json": {
     "stateCleared": "modified",
   },
-  "clientRoot/eslint.config.mjs": {
+  "clientRoot/eslint.config.js": {
     "stateCleared": "modified",
   },
   "clientRoot/jest.conf.js": {
@@ -1725,7 +1725,7 @@ exports[`generator - angular microservice-jwt-skipUserManagement(false)-withAdmi
   "clientRoot/angular.json": {
     "stateCleared": "modified",
   },
-  "clientRoot/eslint.config.mjs": {
+  "clientRoot/eslint.config.js": {
     "stateCleared": "modified",
   },
   "clientRoot/jest.conf.js": {
@@ -2448,7 +2448,7 @@ exports[`generator - angular microservice-oauth2-withAdminUi(true)-skipJhipsterD
   "angular.json": {
     "stateCleared": "modified",
   },
-  "eslint.config.mjs": {
+  "eslint.config.js": {
     "stateCleared": "modified",
   },
   "jest.conf.js": {
@@ -3181,7 +3181,7 @@ exports[`generator - angular monolith-jwt-skipUserManagement(false)-withAdminUi(
   "angular.json": {
     "stateCleared": "modified",
   },
-  "eslint.config.mjs": {
+  "eslint.config.js": {
     "stateCleared": "modified",
   },
   "jest.conf.js": {
@@ -4315,7 +4315,7 @@ exports[`generator - angular monolith-oauth2-withAdminUi(false)-skipJhipsterDepe
   "angular.json": {
     "stateCleared": "modified",
   },
-  "eslint.config.mjs": {
+  "eslint.config.js": {
     "stateCleared": "modified",
   },
   "jest.conf.js": {
@@ -5024,7 +5024,7 @@ exports[`generator - angular monolith-session-skipUserManagement(true)-withAdmin
   "angular.json": {
     "stateCleared": "modified",
   },
-  "eslint.config.mjs": {
+  "eslint.config.js": {
     "stateCleared": "modified",
   },
   "jest.conf.js": {

diff --git a/generators/angular/files-angular.ts b/generators/angular/files-angular.ts
@@ -61,13 +61,13 @@ export const files = asWriteFilesSection({
       condition: ctx => ctx.clientBundlerExperimentalEsbuild,
       templates: [
         { sourceFile: 'angular.json.esbuild', destinationFile: 'angular.json' },
-        'proxy.config.mjs',
-        'build-plugins/define-esbuild.mjs',
+        'proxy.config.js',
+        'build-plugins/define-esbuild.js',
       ],
     }),
     clientRootTemplatesBlock({
       condition: ctx => ctx.clientBundlerExperimentalEsbuild && ctx.enableTranslation,
-      templates: ['build-plugins/i18n-esbuild.mjs'],
+      templates: ['build-plugins/i18n-esbuild.js'],
     }),
     clientSrcTemplatesBlock({
       condition: ctx => ctx.clientBundlerExperimentalEsbuild && ctx.enableTranslation,

diff --git a/generators/angular/generator.spec.ts b/generators/angular/generator.spec.ts
@@ -114,6 +114,16 @@ describe(`generator - ${clientFramework}`, () => {
         runResult.assertNoFileContent(`${clientRootDir}package.json`, /VERSION_MANAGED_BY_CLIENT_VUE/);
       });
 
+      it('should use ESM by default in package.json', () => {
+        runResult.assertFileContent(`${clientRootDir}package.json`, /"type": "module"/);
+      });
+
+      it('should not create files with .mjs extension', () => {
+        const generatedFiles = runResult.getStateSnapshot();
+        const mjsFiles = Object.keys(generatedFiles).filter(file => file.endsWith('.mjs'));
+        expect(mjsFiles).toHaveLength(0);
+      });
+
       describe('withAdminUi', () => {
         const { applicationType, withAdminUi, clientRootDir = '' } = sampleConfig;
         const clientSrcDir = `${clientRootDir}${clientRootDir ? 'src/' : CLIENT_MAIN_SRC_DIR}`;

diff --git a/generators/angular/generator.ts b/generators/angular/generator.ts
@@ -95,7 +95,7 @@ export default class AngularGenerator extends BaseApplicationGenerator<
       applicationDefauts({ application, applicationDefaults }) {
         applicationDefaults({
           __override__: true,
-          eslintConfigFile: app => `eslint.config.${app.packageJsonType === 'module' ? 'js' : 'mjs'}`,
+          eslintConfigFile: _app => `eslint.config.js`,
           webappEnumerationsDir: app => `${app.clientSrcDir}app/entities/enumerations/`,
           angularLocaleId: app => app.nativeLanguageDefinition.angularLocale ?? defaultLanguage.angularLocale!,
         });

diff --git a/generators/angular/templates/angular.json.esbuild.ejs b/generators/angular/templates/angular.json.esbuild.ejs
@@ -40,9 +40,9 @@
           "options": {
             "plugins": [
 <%_ if (enableTranslation) { _%>
-              "build-plugins/i18n-esbuild.mjs",
+              "build-plugins/i18n-esbuild.js",
 <%_ } _%>
-              "build-plugins/define-esbuild.mjs"
+              "build-plugins/define-esbuild.js"
             ],
             "outputPath": {
               "base": "<%= this.relativeDir(clientRootDir, clientDistDir) %>",
@@ -126,7 +126,7 @@
           "options": {
             "buildTarget": "<%= dasherizedBaseName %>:build:development",
             "open": true,
-            "proxyConfig": "proxy.config.mjs",
+            "proxyConfig": "proxy.config.js",
             "port": <%= devServerPort %>
           },
           "configurations": {

diff --git a/...ates/build-plugins/define-esbuild.mjs.ejs → ...lates/build-plugins/define-esbuild.js.ejs b/...ates/build-plugins/define-esbuild.mjs.ejs → ...lates/build-plugins/define-esbuild.js.ejs
diff --git a/...plates/build-plugins/i18n-esbuild.mjs.ejs → ...mplates/build-plugins/i18n-esbuild.js.ejs b/...plates/build-plugins/i18n-esbuild.mjs.ejs → ...mplates/build-plugins/i18n-esbuild.js.ejs
diff --git a/generators/angular/templates/jest.conf.js.ejs b/generators/angular/templates/jest.conf.js.ejs
@@ -23,7 +23,7 @@ const {
 } = require('./tsconfig.json');
 
 module.exports = {
-  transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$|dayjs/esm<% if (applicationTypeGateway && microfrontend) { %>|@angular-architects/module-federation-runtime<% } %>)'],
+  transformIgnorePatterns: ['node_modules/(?!.*\\.js$|dayjs/esm<% if (applicationTypeGateway && microfrontend) { %>|@angular-architects/module-federation-runtime<% } %>)'],
   resolver: 'jest-preset-angular/build/resolvers/ng-jest-resolver.js',
   globals: {
     __VERSION__: 'test',

diff --git a/generators/angular/templates/package.json.ejs b/generators/angular/templates/package.json.ejs
@@ -22,6 +22,7 @@
   "version": "0.0.1-SNAPSHOT",
   "description": "<%= projectDescription %>",
   "private": true,
+  "type": "module",
   "license": "UNLICENSED",
   "cacheDirectories": [
     "node_modules"

diff --git a/...rs/angular/templates/proxy.config.mjs.ejs → ...ors/angular/templates/proxy.config.js.ejs b/...rs/angular/templates/proxy.config.mjs.ejs → ...ors/angular/templates/proxy.config.js.ejs
diff --git a/generators/app/__snapshots__/generator.spec.ts.snap b/generators/app/__snapshots__/generator.spec.ts.snap
@@ -243,7 +243,7 @@ exports[`generator - app with default config should match snapshot 1`] = `
   "camelizedBaseName": "jhipster",
   "capitalizedBaseName": "Jhipster",
   "caret": undefined,
-  "cjsExtension": ".js",
+  "cjsExtension": ".cjs",
   "cli": undefined,
   "cliName": undefined,
   "clientBundler": "webpack",
@@ -467,7 +467,7 @@ exports[`generator - app with default config should match snapshot 1`] = `
     "com.mycompany.myapp",
   ],
   "entitySuffix": "",
-  "eslintConfigFile": "eslint.config.mjs",
+  "eslintConfigFile": "eslint.config.js",
   "feignClient": false,
   "filterEntitiesAndPropertiesForClient": [Function],
   "filterEntitiesForClient": [Function],
@@ -632,7 +632,7 @@ exports[`generator - app with default config should match snapshot 1`] = `
   "messageBrokerPulsar": false,
   "microfrontend": false,
   "microfrontends": undefined,
-  "mjsExtension": ".mjs",
+  "mjsExtension": ".js",
   "monorepository": undefined,
   "nativeLanguage": "en",
   "nativeLanguageDefinition": {
@@ -765,10 +765,7 @@ exports[`generator - app with default config should match snapshot 1`] = `
   ],
   "packageJsonNodeEngine": undefined,
   "packageJsonScripts": {},
-  "packageJsonType": "commonjs",
-  "packageJsonTypeAny": true,
-  "packageJsonTypeCommonjs": true,
-  "packageJsonTypeModule": false,
+  "packageJsonType": "module",
   "packageName": "com.mycompany.myapp",
   "pkType": undefined,
   "prettierExtensions": "md,json,yml,js,cjs,mjs,ts,cts,mts,java,html,css,scss",
@@ -895,7 +892,7 @@ exports[`generator - app with gateway should match snapshot 1`] = `
   "camelizedBaseName": "jhipster",
   "capitalizedBaseName": "Jhipster",
   "caret": undefined,
-  "cjsExtension": ".js",
+  "cjsExtension": ".cjs",
   "cli": undefined,
   "cliName": undefined,
   "clientBundler": "webpack",
@@ -1121,7 +1118,7 @@ exports[`generator - app with gateway should match snapshot 1`] = `
     "com.mycompany.myapp",
   ],
   "entitySuffix": "",
-  "eslintConfigFile": "eslint.config.mjs",
+  "eslintConfigFile": "eslint.config.js",
   "feignClient": false,
   "filterEntitiesAndPropertiesForClient": [Function],
   "filterEntitiesForClient": [Function],
@@ -1280,7 +1277,7 @@ exports[`generator - app with gateway should match snapshot 1`] = `
   "messageBrokerPulsar": false,
   "microfrontend": undefined,
   "microfrontends": undefined,
-  "mjsExtension": ".mjs",
+  "mjsExtension": ".js",
   "monorepository": undefined,
   "nativeLanguage": "en",
   "nativeLanguageDefinition": {
@@ -1413,10 +1410,7 @@ exports[`generator - app with gateway should match snapshot 1`] = `
   ],
   "packageJsonNodeEngine": undefined,
   "packageJsonScripts": {},
-  "packageJsonType": "commonjs",
-  "packageJsonTypeAny": true,
-  "packageJsonTypeCommonjs": true,
-  "packageJsonTypeModule": false,
+  "packageJsonType": "module",
   "packageName": "com.mycompany.myapp",
   "pkType": undefined,
   "prettierExtensions": "md,json,yml,js,cjs,mjs,ts,cts,mts,java,html,css,scss",
@@ -1541,7 +1535,7 @@ exports[`generator - app with microservice should match snapshot 1`] = `
   "camelizedBaseName": "jhipster",
   "capitalizedBaseName": "Jhipster",
   "caret": undefined,
-  "cjsExtension": ".js",
+  "cjsExtension": ".cjs",
   "cli": undefined,
   "cliName": undefined,
   "clientBundler": undefined,
@@ -1913,7 +1907,7 @@ exports[`generator - app with microservice should match snapshot 1`] = `
   "messageBrokerPulsar": false,
   "microfrontend": false,
   "microfrontends": undefined,
-  "mjsExtension": ".mjs",
+  "mjsExtension": ".js",
   "monorepository": undefined,
   "nativeLanguage": "en",
   "nativeLanguageDefinition": {
@@ -1985,10 +1979,7 @@ exports[`generator - app with microservice should match snapshot 1`] = `
   ],
   "packageJsonNodeEngine": undefined,
   "packageJsonScripts": {},
-  "packageJsonType": "commonjs",
-  "packageJsonTypeAny": true,
-  "packageJsonTypeCommonjs": true,
-  "packageJsonTypeModule": false,
+  "packageJsonType": "module",
   "packageName": "com.mycompany.myapp",
   "pkType": undefined,
   "prettierExtensions": "md,json,yml,js,cjs,mjs,ts,cts,mts,java",

diff --git a/generators/base/blueprints.spec.ts b/generators/base/blueprints.spec.ts
@@ -294,15 +294,21 @@ describe('generator - base - local blueprint', () => {
     before(async () => {
       await helpers
         .runJHipster(BLUEPRINT_NS, { useEnvironmentBuilder: true })
-        .withFiles({ '.blueprint/app/index.mjs': BLUEPRINT_CONTENTS })
+        .withFiles({
+          '.blueprint/app/index.js': BLUEPRINT_CONTENTS,
+          '.blueprint/package.json': { type: 'module' },
+        })
         .commitFiles()
         .withJHipsterConfig();
     });
 
     it('creates expected default files', () => {
       expect(runResult.getStateSnapshot()).toMatchInlineSnapshot(`
 {
-  ".blueprint/app/index.mjs": {
+  ".blueprint/app/index.js": {
+    "stateCleared": "modified",
+  },
+  ".blueprint/package.json": {
     "stateCleared": "modified",
   },
   ".yo-rc.json": {

diff --git a/generators/ci-cd/__snapshots__/generator.spec.ts.snap b/generators/ci-cd/__snapshots__/generator.spec.ts.snap
@@ -64,7 +64,7 @@ exports[`generator - ci-cd cli with multiples values should match context snapsh
   "ciCdIntegrationsSonar": false,
   "ciCdJenkins": true,
   "ciCdTravis": false,
-  "cjsExtension": ".js",
+  "cjsExtension": ".cjs",
   "cli": undefined,
   "cliName": undefined,
   "clientBundler": "webpack",
@@ -230,7 +230,7 @@ exports[`generator - ci-cd cli with multiples values should match context snapsh
   "messageBrokerPulsar": false,
   "microfrontend": undefined,
   "microfrontends": undefined,
-  "mjsExtension": ".mjs",
+  "mjsExtension": ".js",
   "monorepository": undefined,
   "nativeLanguage": "en",
   "nativeLanguageDefinition": {
@@ -302,10 +302,7 @@ exports[`generator - ci-cd cli with multiples values should match context snapsh
   ],
   "packageJsonNodeEngine": undefined,
   "packageJsonScripts": {},
-  "packageJsonType": "commonjs",
-  "packageJsonTypeAny": true,
-  "packageJsonTypeCommonjs": true,
-  "packageJsonTypeModule": false,
+  "packageJsonType": "module",
   "packageName": "com.mycompany.myapp",
   "pkType": undefined,
   "prettierTabWidth": undefined,

diff --git a/generators/client/generators/bootstrap/__snapshots__/generator.spec.ts.snap b/generators/client/generators/bootstrap/__snapshots__/generator.spec.ts.snap
@@ -40,7 +40,7 @@ exports[`generator - client:bootstrap bootstrapping default config should prepar
   "camelizedBaseName": "jhipster",
   "capitalizedBaseName": "Jhipster",
   "caret": undefined,
-  "cjsExtension": ".js",
+  "cjsExtension": ".cjs",
   "cli": undefined,
   "cliName": undefined,
   "clientBundler": "webpack",
@@ -181,7 +181,7 @@ exports[`generator - client:bootstrap bootstrapping default config should prepar
   "messageBrokerPulsar": false,
   "microfrontend": false,
   "microfrontends": undefined,
-  "mjsExtension": ".mjs",
+  "mjsExtension": ".js",
   "monorepository": undefined,
   "nativeLanguage": "en",
   "nativeLanguageDefinition": Any<Object>,
@@ -192,10 +192,7 @@ exports[`generator - client:bootstrap bootstrapping default config should prepar
   "packageFolder": undefined,
   "packageJsonNodeEngine": undefined,
   "packageJsonScripts": Any<Object>,
-  "packageJsonType": "commonjs",
-  "packageJsonTypeAny": true,
-  "packageJsonTypeCommonjs": true,
-  "packageJsonTypeModule": false,
+  "packageJsonType": "module",
   "packageName": "com.mycompany.myapp",
   "pkType": undefined,
   "prettierTabWidth": undefined,

diff --git a/generators/common/__snapshots__/generator.spec.ts.snap b/generators/common/__snapshots__/generator.spec.ts.snap
@@ -153,6 +153,7 @@ This application was generated using JHipster JHIPSTER_VERSION, you can find doc
   "package.json": {
     "contents": "{
   "private": true,
+  "type": "module",
   "dependencies": {},
   "devDependencies": {
     "generator-jhipster": "JHIPSTER_VERSION",

diff --git a/generators/common/generators/bootstrap/__snapshots__/generator.spec.ts.snap b/generators/common/generators/bootstrap/__snapshots__/generator.spec.ts.snap
@@ -40,7 +40,7 @@ exports[`generator - common:bootstrap bootstrapping default config should prepar
   "camelizedBaseName": "jhipster",
   "capitalizedBaseName": "Jhipster",
   "caret": undefined,
-  "cjsExtension": ".js",
+  "cjsExtension": ".cjs",
   "cli": undefined,
   "cliName": undefined,
   "clientBundler": "webpack",
@@ -174,7 +174,7 @@ exports[`generator - common:bootstrap bootstrapping default config should prepar
   "messageBrokerPulsar": false,
   "microfrontend": false,
   "microfrontends": undefined,
-  "mjsExtension": ".mjs",
+  "mjsExtension": ".js",
   "monorepository": undefined,
   "nativeLanguage": "en",
   "nativeLanguageDefinition": Any<Object>,
@@ -185,10 +185,7 @@ exports[`generator - common:bootstrap bootstrapping default config should prepar
   "packageFolder": undefined,
   "packageJsonNodeEngine": undefined,
   "packageJsonScripts": Any<Object>,
-  "packageJsonType": "commonjs",
-  "packageJsonTypeAny": true,
-  "packageJsonTypeCommonjs": true,
-  "packageJsonTypeModule": false,
+  "packageJsonType": "module",
   "packageName": "com.mycompany.myapp",
   "pkType": undefined,
   "prettierTabWidth": undefined,