diff --git a/lib/node-loader-http.js b/lib/node-loader-http.js
index 2936522..d5d13d8 100644
--- a/lib/node-loader-http.js
+++ b/lib/node-loader-http.js
@@ -27,20 +27,25 @@ export function resolve(specifier, context, defaultResolve) {
 
 export function getFormat(url, context, defaultGetFormat) {
   if (useLoader(url)) {
-    let isModule;
+    let format;
+    // TODO: maybe change to content-type / mime type check rather than file extensions
     if (url.endsWith(".mjs")) {
-      isModule = true;
+      format = "module";
     } else if (url.endsWith(".cjs")) {
-      isModule = false;
+      format = "commonjs";
+    } else if (url.endsWith(".wasm")) {
+      format = "wasm";
+    } else if (url.endsWith(".json")) {
+      format = "json";
     } else {
       // default to true, since NodeJS loaders only are triggered by ESM code
       // Alternatively, we could consider looking up the nearest package.json to the process.cwd()
       // And seeing if it has `"type": "module"`
-      isModule = true;
+      format = "module";
     }
 
     return {
-      format: "module",
+      format,
     };
   }
 
diff --git a/test/basic.test.js b/test/basic.test.js
index 7be21c7..faf17b8 100644
--- a/test/basic.test.js
+++ b/test/basic.test.js
@@ -5,7 +5,6 @@ describe(`basic http / https tests`, () => {
     const ns = await import(
       "http://unpkg.com/single-spa@5.5.5/lib/esm/single-spa.dev.js"
     );
-    console.log("ns", ns);
     assert.ok(ns.start);
     ns.start();
   });
@@ -14,8 +13,12 @@ describe(`basic http / https tests`, () => {
     const ns = await import(
       "https://unpkg.com/single-spa@5.5.5/lib/esm/single-spa.dev.js"
     );
-    console.log("ns", ns);
     assert.ok(ns.start);
     ns.start();
   });
+
+  it(`can load a json module`, async () => {
+    const ns = await import("https://unpkg.com/single-spa@5.5.5/package.json");
+    assert.equal(ns.default.name, "single-spa");
+  });
 });