diff --git a/js-comint.el b/js-comint.el
index 22bf916..8c6a93e 100644
--- a/js-comint.el
+++ b/js-comint.el
@@ -137,8 +137,11 @@
 (defvar js-comint-code-format
   (concat
    "process.stdout.columns = %d;"
-   "require('repl').start('%s', null, null, true, false, "
-   "require('repl')['REPL_MODE_' + '%s'.toUpperCase()])"))
+   "require('repl').start({
+\"prompt\": '%s',
+\"ignoreUndefined\": true,
+\"preview\": true
+})"))
 
 (defvar js-nvm-current-version nil
   "Current version of node for js-comint.
@@ -308,9 +311,8 @@ Create a new Javascript REPL process."
                                                js-comint-module-paths)))
            (all-paths-list (seq-remove 'string-empty-p all-paths-list))
            (local-node-path (string-join all-paths-list (js-comint--path-sep)))
-           (repl-mode (or (getenv "NODE_REPL_MODE") "magic"))
            (js-comint-code (format js-comint-code-format
-                          (window-width) js-comint-prompt repl-mode)))
+                          (window-width) js-comint-prompt)))
       (with-environment-variables (("NODE_NO_READLINE" "1")
                                    ("NODE_PATH" local-node-path))
         (pop-to-buffer
diff --git a/test-js-comint.el b/test-js-comint.el
index fff330c..e3cfb04 100644
--- a/test-js-comint.el
+++ b/test-js-comint.el
@@ -116,3 +116,9 @@ reduce((prev, curr) => prev + curr, 0);" "^9$")))
       (setenv "NODE_PATH" original-env)
       (fset 'js-comint--suggest-module-path original-suggest)
       (js-comint-test-exit-comint))))
+
+(ert-deftest js-comint/test-strict-mode ()
+  "When NODE_REPL_MODE=strict should use strict mode."
+  (with-environment-variables (("NODE_REPL_MODE" "strict"))
+    ;; global variables are not allowed in strict mode
+    (js-comint-test-output-matches "foo = 5;" "Uncaught ReferenceError.*")))