diff --git a/packages/js/src/generators/library/files/lib/tsconfig.json__tmpl__ b/packages/js/src/generators/library/files/lib/tsconfig.json__tmpl__
index da6f51affaaa6..8d27bd10719eb 100644
--- a/packages/js/src/generators/library/files/lib/tsconfig.json__tmpl__
+++ b/packages/js/src/generators/library/files/lib/tsconfig.json__tmpl__
@@ -1,7 +1,7 @@
 {
   "extends": "<%= rootTsConfigPath %>",
   "compilerOptions": {
-    "module": "CommonJS"<% if (js) { %>,
+    "module": "commonjs"<% if (js) { %>,
     "allowJs": true<% } %>
   },
   "files": [],
diff --git a/packages/js/src/generators/library/library.spec.ts b/packages/js/src/generators/library/library.spec.ts
index bcda94e582795..2ca0b02e7c4dd 100644
--- a/packages/js/src/generators/library/library.spec.ts
+++ b/packages/js/src/generators/library/library.spec.ts
@@ -140,7 +140,7 @@ describe('lib', () => {
                   Object {
                     "compilerOptions": Object {
                       "forceConsistentCasingInFileNames": true,
-                      "module": "CommonJS",
+                      "module": "commonjs",
                       "noFallthroughCasesInSwitch": true,
                       "noImplicitOverride": true,
                       "noImplicitReturns": true,
diff --git a/packages/nest/src/generators/library/__snapshots__/library.spec.ts.snap b/packages/nest/src/generators/library/__snapshots__/library.spec.ts.snap
index 46914eaad4728..4adc174f94238 100644
--- a/packages/nest/src/generators/library/__snapshots__/library.spec.ts.snap
+++ b/packages/nest/src/generators/library/__snapshots__/library.spec.ts.snap
@@ -40,7 +40,7 @@ exports[`lib --testEnvironment should set target jest testEnvironment to node by
 exports[`lib --unit-test-runner none should not generate test configuration 1`] = `
 Object {
   "compilerOptions": Object {
-    "module": "CommonJS",
+    "module": "commonjs",
   },
   "extends": "../../tsconfig.base.json",
   "files": Array [],
@@ -70,7 +70,7 @@ Object {
 exports[`lib nested should create a local tsconfig.json 1`] = `
 Object {
   "compilerOptions": Object {
-    "module": "CommonJS",
+    "module": "commonjs",
   },
   "extends": "../../../tsconfig.base.json",
   "files": Array [],
@@ -102,7 +102,7 @@ export class MyLibModule {}
 exports[`lib not nested should create a local tsconfig.json 1`] = `
 Object {
   "compilerOptions": Object {
-    "module": "CommonJS",
+    "module": "commonjs",
   },
   "extends": "../../tsconfig.base.json",
   "files": Array [],