diff --git a/source/SentenceCase.popclipext/Config.js b/source/SentenceCase.popclipext/Config.js
deleted file mode 100644
index 869fe113..00000000
--- a/source/SentenceCase.popclipext/Config.js
+++ /dev/null
@@ -1,7 +0,0 @@
-define({
-    identifier: "com.pilotmoon.popclip.extension.sentence-case",
-    name: "Sentence Case",
-    icon: "square filled S",
-    action: require('sentence-case.js'),
-    popclipVersion: 3482,
-});
\ No newline at end of file
diff --git a/source/SentenceCase.popclipext/Config.json b/source/SentenceCase.popclipext/Config.json
index 5eca2524..926a1c60 100644
--- a/source/SentenceCase.popclipext/Config.json
+++ b/source/SentenceCase.popclipext/Config.json
@@ -1,16 +1,8 @@
 {
-  "Actions" : [
-    {
-      "After" : "paste-result",
-      "Image File" : "sentence-case.png",
-      "Script Interpreter" : "\/usr\/bin\/php",
-      "Shell Script File" : "sentence-case.php",
-      "Title" : "Sentence Case"
-    }
-  ],
-  "Extension Description" : "Start each selected sentence with a capital letter.",
-  "Extension Identifier" : "com.pilotmoon.popclip.extension.sentence-case",
-  "Extension Name" : "Sentence Case",
-  "Note": "Updated for macOS 12.0 Monterey.",
-  "popclipVersion" : 3543
+  "name" : "Sentence Case",  
+  "identifier" : "com.pilotmoon.popclip.extension.sentence-case",
+  "description" : "Start each selected sentence with a capital letter.",
+  "icon": "square filled S",
+  "popclip version" : 4151,
+  "module": "sentence-case.js"
 }
\ No newline at end of file
diff --git a/source/SentenceCase.popclipext/sentence-case.js b/source/SentenceCase.popclipext/sentence-case.js
index 7766ef43..9cc97f3f 100644
--- a/source/SentenceCase.popclipext/sentence-case.js
+++ b/source/SentenceCase.popclipext/sentence-case.js
@@ -1,32 +1,31 @@
-function sentenceCase(text) {    
-    const regex=/(^\s*\p{L}{1}|[.?!]\s+\p{L}{1})/gu; // split into something approximating sentences
-    text = text.toLowerCase();
-    return text.replace(regex, (match) => match.toUpperCase());
+function sentenceCase(text) {
+  const regex = /(^\s*\p{L}{1}|[.?!]\s+\p{L}{1})/gu; // split into something approximating sentences
+  text = text.toLowerCase();
+  return text.replace(regex, (match) => match.toUpperCase());
 }
 
-if (typeof(define) !== 'undefined') { // when running in popclip, export the function
-    define(() => {
-        return (selection) => {
-            popclip.pasteText(sentenceCase(selection.text));
-        }
-    })
-}
-else { // when running in jsc, perform tests
-    function test() {
-        const data=[
-            ["blah", "Blah"],
-            ["BLAH. blah.", "Blah. Blah."],
-            ["  BLAH blah? BHAL.\nff", "  Blah blah? Bhal.\nFf"],
-            ["BLAH (blah-more", "Blah (blah-more"],
-            ["élan fdf? написанная! OK", "Élan fdf? Написанная! Ok"],
-        
-            ["Nick's   best dog's fur", "Nick's   best dog's fur"],
-        ];
-        data.forEach((pair) => {
-            const [input, output]=pair;
-            const result=sentenceCase(input);
-            print(`${output===result?'pass  ':'fail *'} ${input} => ${result} (expected: ${output})`);
-        });
-    }
-    test();
+exports.action = (input) => {
+  popclip.pasteText(sentenceCase(input.text));
+};
+
+function test() {
+  const data = [
+    ["blah", "Blah"],
+    ["BLAH. blah.", "Blah. Blah."],
+    ["  BLAH blah? BHAL.\nff", "  Blah blah? Bhal.\nFf"],
+    ["BLAH (blah-more", "Blah (blah-more"],
+    ["élan fdf? написанная! OK", "Élan fdf? Написанная! Ok"],
+
+    ["Nick's   best dog's fur", "Nick's   best dog's fur"],
+  ];
+  data.forEach((pair) => {
+    const [input, output] = pair;
+    const result = sentenceCase(input);
+    print(
+      `${
+        output === result ? "pass  " : "fail *"
+      } ${input} => ${result} (expected: ${output})`,
+    );
+  });
 }
+// test();
diff --git a/source/SentenceCase.popclipext/sentence-case.php b/source/SentenceCase.popclipext/sentence-case.php
deleted file mode 100644
index b47e6117..00000000
--- a/source/SentenceCase.popclipext/sentence-case.php
+++ /dev/null
@@ -1,26 +0,0 @@
-<?php
-mb_internal_encoding("UTF-8");
-$input=getenv('POPCLIP_TEXT');
-//$input="  the sky is blue. grass is green!  is the\nfrog green too?... . something";
-
-function mb_ucfirst($string)
-{
-    $strlen = mb_strlen($string);
-    $firstChar = mb_substr($string, 0, 1);
-    $then = mb_substr($string, 1, $strlen - 1);
-    return mb_strtoupper($firstChar) . $then;
-}
-
-// split into leading space and the rest
-$initial_space=preg_match('/(\s*)(.*)/u', $input, $matches);
-$result=$matches[1];
-
-// split into sentences. delimiter is any space preceded by [.?!].
-// include the spaces between sentences in the result, so we can reconstruct the spacing.
-$split = preg_split('/((?<=[.?!])\s+)/um', $matches[2], NULL, PREG_SPLIT_DELIM_CAPTURE);
-
-foreach ($split as $fragment) {
-	$result .= mb_ucfirst(mb_strtolower($fragment));
-}
-echo $result;
-?>
\ No newline at end of file
diff --git a/source/SentenceCase.popclipext/sentence-case.png b/source/SentenceCase.popclipext/sentence-case.png
deleted file mode 100644
index aa85278b..00000000
Binary files a/source/SentenceCase.popclipext/sentence-case.png and /dev/null differ
diff --git a/source/Uppercase.popclipext/Config.js b/source/Uppercase.popclipext/Config.js
index 001e6203..d76ce0cc 100644
--- a/source/Uppercase.popclipext/Config.js
+++ b/source/Uppercase.popclipext/Config.js
@@ -1,8 +1,10 @@
-define({
-    identifier: "com.pilotmoon.popclip.extension.uppercase",
-    name: "Uppercase",
-    icon: "square filled AB",
-    action: (selection) => {
-        popclip.pasteText(selection.text.toUpperCase());
-    }
-})
\ No newline at end of file
+// #popclip
+// name: Uppercase
+// #identifier: com.pilotmoon.popclip.extension.uppercase
+// description: Make the selected text ALL UPPERCASE.
+// icon: "square filled AB"
+// popclip version: 4151
+
+exports.action = (input) => {
+  popclip.pasteText(input.text.toUpperCase());
+};
diff --git a/source/Uppercase.popclipext/Config.json b/source/Uppercase.popclipext/Config.json
deleted file mode 100644
index c5d63352..00000000
--- a/source/Uppercase.popclipext/Config.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "Actions" : [
-    {
-      "After" : "paste-result",
-      "Image File" : "uppercase.png",
-      "Script Interpreter" : "\/usr\/bin\/php",
-      "Shell Script File" : "uppercase.php",
-      "Title" : "Uppercase"
-    }
-  ],
-  "Extension Description" : "Make the selected text ALL UPPERCASE.",
-  "Extension Identifier" : "com.pilotmoon.popclip.extension.uppercase",
-  "Extension Name" : "Uppercase",
-  "Note" : "Updated for macOS 12.0 Monterey.",
-  "popclipVersion": 3543
-}
\ No newline at end of file
diff --git a/source/Uppercase.popclipext/uppercase.png b/source/Uppercase.popclipext/uppercase.png
deleted file mode 100644
index cd539512..00000000
Binary files a/source/Uppercase.popclipext/uppercase.png and /dev/null differ