diff --git a/Gulpfile.js b/Gulpfile.js
index eb40d3e..1c89a15 100644
--- a/Gulpfile.js
+++ b/Gulpfile.js
@@ -16,6 +16,7 @@ var APP_DIR             = path.join(__dirname, 'test/data/test-app-regular');
 var ASAR_ARCHIVE_PATH   = path.join(__dirname, 'test/data/test-app.asar');
 var CONFIG_PATH_REGULAR = path.join(__dirname, 'test/data/app-config-regular');
 var CONFIG_PATH_ASAR    = path.join(__dirname, 'test/data/app-config-asar');
+var CONFIG_PATH_JS      = path.join(__dirname, 'test/data/app-config-js');
 
 function clean () {
     return del(['lib', '.screenshots']);
@@ -54,11 +55,24 @@ function testAsarApp () {
     return childProcess.spawn('testcafe', ['electron:' + CONFIG_PATH_ASAR, 'test/fixtures/**/*-test.js', '-s', '.screenshots'], { shell: true, stdio: 'inherit' });
 }
 
+function testJsConfig () {
+    delete process.env.ASAR_MODE;
+
+    return childProcess.spawn('testcafe', ['electron:' + CONFIG_PATH_JS, 'test/fixtures/**/*-test.js', '-s', '.screenshots'], { shell: true, stdio: 'inherit' });
+}
+function testJsConfigSpecifically () {
+    delete process.env.ASAR_MODE;
+
+    return childProcess.spawn('testcafe', ['electron:' + CONFIG_PATH_JS + '/.testcafe-electron-rc.js', 'test/fixtures/**/*-test.js', '-s', '.screenshots'], { shell: true, stdio: 'inherit' });
+}
+
 exports.lint  = lint;
 exports.build = gulp.parallel(lint, gulp.series(clean, build));
 exports.test  = gulp.series(
     exports.build,
     testRegularApp,
+    testJsConfigSpecifically,
+    testJsConfig,
     'pack-to-asar-archive',
     testAsarApp
 );
diff --git a/src/utils/get-config.js b/src/utils/get-config.js
index f0c1d44..8321b88 100644
--- a/src/utils/get-config.js
+++ b/src/utils/get-config.js
@@ -1,4 +1,4 @@
-import { readFileSync, statSync } from 'fs';
+import { readFileSync, statSync, existsSync } from 'fs';
 import path from 'path';
 import resolveFileUrl from './resolve-file-url';
 import isAbsolute from './is-absolute';
@@ -8,13 +8,40 @@ import CONSTANTS from '../constants';
 const PROTOCOL_RE = /^([\w-]+?)(?=\:\/\/)/;
 
 export default function (id, mainPath) {
-    if (statSync(mainPath).isDirectory())
-        mainPath = path.join(mainPath, CONSTANTS.configFileName);
+    let configPath = mainPath;
+    let config;
+    let mainDir;
 
-    var mainDir      = path.dirname(mainPath);
-    var configString = readFileSync(mainPath).toString();
+    if (statSync(mainPath).isDirectory()) {
+        mainDir = mainPath;
 
-    var config = JSON.parse(configString);
+        const allowedExtensions = [ '.js', '.json' ];
+
+        // get first allowed extension config file that exists.
+        allowedExtensions.some( ext => {
+            const possibleConfig = path.join(mainPath, CONSTANTS.configFileName + ext );
+
+            const exists = existsSync( possibleConfig );
+
+            if ( exists )
+                configPath = possibleConfig;
+
+            return exists;
+        });
+    }
+
+    mainDir = mainDir || path.dirname(mainPath);
+
+    // check if we have a specific ext and can use require.
+    if ( path.extname( configPath ) ) 
+        config = require( configPath );
+    
+    else {
+        // fall back to .testcafe-electron-rc file w/ no extension
+        const configString = readFileSync(path.join(mainPath, CONSTANTS.configFileName )).toString();
+
+        config = JSON.parse(configString);
+    }
 
     if (config.appPath && !isAbsolute(config.appPath))
         config.appPath = path.resolve(mainDir, config.appPath);
diff --git a/test/data/app-config-js/.testcafe-electron-rc.js b/test/data/app-config-js/.testcafe-electron-rc.js
new file mode 100644
index 0000000..07b4131
--- /dev/null
+++ b/test/data/app-config-js/.testcafe-electron-rc.js
@@ -0,0 +1,4 @@
+module.exports = {
+  "mainWindowUrl": "../test-app-regular/index.html",
+  "appPath": "../test-app-regular"
+}