diff --git a/changelog.md b/changelog.md
index 7afa9cc..47049d9 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,10 +1,11 @@
 Changelog
 =========
 
-0.2.0 (????-??-??)
+1.0.0 (????-??-??)
 ------------------
 
 * Updated to Typescript 5.
+* Conversion from Typescript to Javascript.
 
 
 0.1.12 (2022-10-22)
diff --git a/package.json b/package.json
index be5622f..c4508d7 100644
--- a/package.json
+++ b/package.json
@@ -2,12 +2,12 @@
   "name": "html-form-enhancer",
   "version": "0.1.12",
   "description": "Adds support for enctype=\"application/json\", more HTTP methods and HTTP status codes to HTML forms",
-  "export": "html-form-enhancer.mjs",
-  "main": "dist/html-form-enhancer.js",
+  "export": "src/html-form-enhancer.mjs",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "lint": "eslint"
   },
+  "type": "module",
   "keywords": [
     "html",
     "json",
diff --git a/src/html-form-enhancer.ts b/src/html-form-enhancer.js
similarity index 88%
rename from src/html-form-enhancer.ts
rename to src/html-form-enhancer.js
index f833113..2e68ed4 100644
--- a/src/html-form-enhancer.ts
+++ b/src/html-form-enhancer.js
@@ -1,7 +1,9 @@
-/* eslint no-console: 0 */
 import { serializeJsonForm } from './serialize-json-form.js';
 
-export function enhanceForm(elem: HTMLFormElement) {
+/**
+ * @param {HTMLFormElement} elem
+ */
+export function enhanceForm(elem) {
 
   elem.addEventListener('submit', (ev) => {
 
@@ -12,7 +14,10 @@ export function enhanceForm(elem: HTMLFormElement) {
 
 }
 
-export function autoEnhanceForms(doc: Document) {
+/**
+ * @param {Document} doc
+ */
+export function autoEnhanceForms(doc) {
   const forms = doc.getElementsByTagName('form');
   for(const form of forms) {
 
@@ -30,7 +35,10 @@ export function autoEnhanceForms(doc: Document) {
 
 autoEnhanceForms(document);
 
-async function processSubmit(elem: HTMLFormElement) {
+/**
+ * @param {HTMLFormElement} elem
+ */
+async function processSubmit(elem) {
 
   const method = elem.getAttribute('method')?.toUpperCase() || 'GET';
   const encType = elem.getAttribute('enctype')?.toLowerCase() || 'application/x-www-form-urlencoded';
@@ -51,7 +59,9 @@ async function processSubmit(elem: HTMLFormElement) {
   } else {
 
     if (!encType || encType === 'application/x-www-form-urlencoded') {
-      body = new URLSearchParams(Object.fromEntries(new FormData(elem).entries()) as Record<string, string>);
+      body = new URLSearchParams(
+        /** @type {any} */(new FormData(elem))
+      );
     } else if (encType === 'application/json' || encType.match(/^application\/(.*)\+json$/)) {
       body = JSON.stringify(serializeJsonForm(elem));
     }
@@ -63,7 +73,7 @@ async function processSubmit(elem: HTMLFormElement) {
     response = await fetch(action, {
       method,
       headers: {
-        'Content-Type': encType!,
+        'Content-Type': encType,
         'Accept': 'text/html',
       },
       body,
@@ -123,7 +133,10 @@ async function processSubmit(elem: HTMLFormElement) {
 
 }
 
-async function replaceBody(response: Response) {
+/**
+ * @param {Response} response
+ */
+async function replaceBody(response) {
 
   const responseBody = await response.text();
   const domParser = new DOMParser();
diff --git a/src/serialize-json-form.ts b/src/serialize-json-form.js
similarity index 89%
rename from src/serialize-json-form.ts
rename to src/serialize-json-form.js
index 20a34ea..574713e 100644
--- a/src/serialize-json-form.ts
+++ b/src/serialize-json-form.js
@@ -3,7 +3,7 @@
  *
  * https://github.com/defunctzombie/form-serialize/blob/master/LICENSE
  *
- * It's cleaned up, modernized and converted to Typescript, but the original
+ * It's cleaned up and modernized, but the original
  * is Copyright (c) 2013 Roman Shtylman and licensed under the MIT license.
  */
 
@@ -17,9 +17,10 @@ const brackets = /(\[[^[\]]*\])/g;
 /**
  * Serializes a form into html-json-forms format.
  *
+ * @param {HTMLFormElement} form
  * https://www.w3.org/TR/html-json-forms/
  */
-export function serializeJsonForm(form: HTMLFormElement) {
+export function serializeJsonForm(form) {
 
   let result = {};
 
@@ -112,7 +113,11 @@ export function serializeJsonForm(form: HTMLFormElement) {
   return result;
 }
 
-function parse_keys(str: string): string[] {
+/**
+ * @param {string} str
+ * @returns {string[]}
+ */
+function parse_keys(str) {
   const keys = [];
   const prefix = /^([^[\]]*)/;
   const children = new RegExp(brackets);
@@ -130,18 +135,18 @@ function parse_keys(str: string): string[] {
 }
 
 /**
- * Too hard to type right now
+ * @param {any} result
+ * @param {string[]} keys
+ * @param {any} value
  */
-type Result = any;
-type Value = string;
-
-function hash_assign(result: Result, keys: string[], value: Value): Result {
+function hash_assign(result, keys, value) {
   if (keys.length === 0) {
     result = value;
     return result;
   }
 
-  const key = keys.shift()!;
+  const key = keys.shift();
+  if (!key) return result;
   const between = key.match(/^\[(.+?)\]$/);
 
   if (key === '[]') {
@@ -189,8 +194,12 @@ function hash_assign(result: Result, keys: string[], value: Value): Result {
   return result;
 }
 
-// Object/hash encoding serializer.
-function hash_serializer(result: Result, key: string, value: Value) {
+/**
+ * @param {any} result
+ * @param {string} key
+ * @param {any} value
+ */
+function hash_serializer(result, key, value) {
   const matches = key.match(brackets);
 
   // Has brackets? Use the recursive assignment function to walk the keys,
@@ -225,7 +234,11 @@ function hash_serializer(result: Result, key: string, value: Value) {
   return result;
 }
 
-function isValidInputField(elem: Element): elem is HTMLFormElement {
+/**
+ * @param {Element} elem
+ * @returns {elem is HTMLFormElement}
+ */
+function isValidInputField(elem) {
 
   const supportedElements = ['input', 'select', 'textarea'];
   const unsupportedInputType = ['submit' , 'button' , 'image' , 'reset' , 'file'];
@@ -234,7 +247,11 @@ function isValidInputField(elem: Element): elem is HTMLFormElement {
     return false;
   }
 
-  if (unsupportedInputType.includes((elem as any).type)) {
+  if (!(elem instanceof HTMLInputElement)) {
+    return false;
+  }
+
+  if (unsupportedInputType.includes(elem.type)) {
     return false;
   }
   return true;
diff --git a/tsconfig.json b/tsconfig.json
index 81757dc..e4fff73 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -9,13 +9,14 @@
 
         "moduleResolution": "node",
         "sourceMap": true,
-        "outDir": "dist",
+        "noEmit": true,
         "baseUrl": ".",
         "paths": {
             "*": [
                 "src/types/*"
             ]
         },
+        "checkJs": true,
         "lib": [
           "DOM",
           "DOM.Iterable",