diff --git a/lapdMouseBrowser.json b/lapdMouseBrowser.json
new file mode 100644
index 00000000..4e7b159c
--- /dev/null
+++ b/lapdMouseBrowser.json
@@ -0,0 +1,8 @@
+{
+  "$schema": "https://raw.githubusercontent.com/Slicer/Slicer/main/Schemas/slicer-extension-catalog-entry-schema-v1.0.0.json#",
+  "build_dependencies": [],
+  "build_subdirectory": ".",
+  "category": "Informatics",
+  "scm_revision": "master",
+  "scm_url": "https://github.com/lapdMouse/Slicer-lapdMouseBrowser.git"
+}
diff --git a/lapdMouseBrowser.s4ext b/lapdMouseBrowser.s4ext
deleted file mode 100644
index d423e3c2..00000000
--- a/lapdMouseBrowser.s4ext
+++ /dev/null
@@ -1,45 +0,0 @@
-#
-# First token of each non-comment line is the keyword and the rest of the line
-# (including spaces) is the value.
-# - the value can be blank
-#
-
-# This is source code manager
-scm git
-scmurl https://github.com/lapdMouse/Slicer-lapdMouseBrowser.git
-scmrevision master
-
-# list dependencies
-# - These should be names of other modules that have .s4ext files
-# - The dependencies will be built first
-depends NA
-
-# Inner build directory (default is ".")
-build_subdirectory .
-
-# homepage
-homepage https://github.com/lapdMouse/Slicer-lapdMouseBrowser
-
-# Firstname1 Lastname1 ([SubOrg1, ]Org1), Firstname2 Lastname2 ([SubOrg2, ]Org2)
-# For example: Jane Roe (Superware), John Doe (Lab1, Nowhere), Joe Bloggs (Noware)
-contributors Christian Bauer (University of Iowa), Reinhard Beichel (University of Iowa), Melissa Krueger (University of Washington), Robb Glenny (University of Washington)
-
-# Match category in the xml description of the module (where it shows up in Modules menu)
-category Informatics
-
-# url to icon (png, size 128x128 pixels)
-iconurl https://raw.githubusercontent.com/lapdMouse/Slicer-lapdMouseBrowser/master/lapdMouseBrowser.png
-
-# Give people an idea what to expect from this code
-#  - Is it just a test or something you stand behind?
-status 
-
-# One line stating what the module does
-description Connect to the lapdMouse archive, browse the collection, download and visualize data files in 3D Slicer.
-
-# Space separated list of urls
-screenshoturls https://raw.githubusercontent.com/lapdMouse/Slicer-lapdMouseBrowser/master/Screenshots/LapdMouseDBBrowserWindow.png https://raw.githubusercontent.com/lapdMouse/Slicer-lapdMouseBrowser/master/Screenshots/LapdMouseStandardFiles.png https://raw.githubusercontent.com/lapdMouse/Slicer-lapdMouseBrowser/master/Screenshots/LapdMouseNearAciniTree.png
-
-
-# 0 or 1: Define if the extension should be enabled after its installation.
-enabled 1