diff --git a/js/.eslintrc.js b/js/.eslintrc.js
index 106c76b..283d75c 100644
--- a/js/.eslintrc.js
+++ b/js/.eslintrc.js
@@ -1,7 +1,6 @@
 // Copyright 2019-2021, University of Colorado Boulder
 // @author Chris Klusendorf
 
-'use strict';
 
 module.exports = {
 
diff --git a/js/createHTMLString.js b/js/createHTMLString.js
index 7fba92a..d41f25a 100644
--- a/js/createHTMLString.js
+++ b/js/createHTMLString.js
@@ -5,7 +5,6 @@
  * @author Sam Reid (PhET Interactive Simulations)
  */
 
-'use strict';
 
 // const getMarkdownFileAsHTML = require( './getMarkdownFileAsHTML' );
 const fs = require( 'fs' );
diff --git a/js/generate.js b/js/generate.js
index 5df81f7..9934dca 100644
--- a/js/generate.js
+++ b/js/generate.js
@@ -6,7 +6,6 @@
  * @author Michael Kauzmann (PhET Interactive Simulations)
  */
 
-'use strict';
 
 const createHTMLString = require( './createHTMLString' );
 const fs = require( 'fs' );
diff --git a/js/getFromSimInMaster.js b/js/getFromSimInMaster.js
index a18a48e..6c79f95 100644
--- a/js/getFromSimInMaster.js
+++ b/js/getFromSimInMaster.js
@@ -17,7 +17,6 @@
  * @author Michael Kauzmann (PhET Interactive Simulations)
  */
 
-'use strict';
 
 // modules
 const _ = require( 'lodash' ); // eslint-disable-line
diff --git a/js/getMarkdownFileAsHTML.js b/js/getMarkdownFileAsHTML.js
index 8a4a3fe..1beee0b 100644
--- a/js/getMarkdownFileAsHTML.js
+++ b/js/getMarkdownFileAsHTML.js
@@ -5,7 +5,6 @@
  * @author Michael Kauzmann (PhET Interactive Simulations)
  */
 
-'use strict';
 
 // modules
 const fs = require( 'fs' );
diff --git a/js/serverTest.js b/js/serverTest.js
index 5818fa8..8b265fe 100644
--- a/js/serverTest.js
+++ b/js/serverTest.js
@@ -1,6 +1,5 @@
 // Copyright 2018-2021, University of Colorado Boulder
 
-'use strict';
 
 const assert = require( 'assert' );
 const buildLocal = require( '../../perennial/js/common/buildLocal' );