diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cebf254
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+*.gba
+*.sav
+*.sgm
+*.iml
+.idea
+node_modules
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..141c535
--- /dev/null
+++ b/index.js
@@ -0,0 +1,12 @@
+#! /usr/bin/env node
+const { program } = require('commander')
+const {applyPatch}  = require('./js/cmd')
+program
+    .command('patch')
+    .description('List all the TODO tasks')
+    .argument('<file>', 'the patch to apply')
+    .argument('<file>','the rom file getting the patch')
+    .option('-v, --validate-checksum','should validate checksum')
+    .action((patch, romFile, options) => applyPatch(romFile, patch, options));
+
+program.parse()
\ No newline at end of file
diff --git a/js/File.js b/js/File.js
new file mode 100644
index 0000000..bb0d23b
--- /dev/null
+++ b/js/File.js
@@ -0,0 +1,12 @@
+const path = require('path');
+const fs = require("fs");
+
+exports.File = File;
+
+function File(_path) {
+    this.stat = fs.statSync(_path);
+    this.size = this.stat.size;
+    this.name = path.basename(_path);
+    this.type = this.stat.type;
+    this.data = fs.readFileSync(_path);
+}
\ No newline at end of file
diff --git a/js/MarcFile.js b/js/MarcFile.js
index ec86c08..f12be87 100644
--- a/js/MarcFile.js
+++ b/js/MarcFile.js
@@ -1,6 +1,11 @@
 /* MODDED VERSION OF MarcFile.js v20230202 - Marc Robledo 2014-2023 - http://www.marcrobledo.com/license */
 
-function MarcFile(source, onLoad){	
+if(typeof module !== "undefined" && module.exports){
+	exports.MarcFile = MarcFile;
+	// saveAs = (blob,fileName) => fs.writeFileSync(fileName, blob.arrayBuffer())
+}
+
+function MarcFile(source, onLoad){
 	if(typeof source==='object' && source.files) /* get first file only if source is input with multiple files */
 		source=source.files[0];
 
@@ -9,27 +14,34 @@ function MarcFile(source, onLoad){
 	this._lastRead=null;
 
 	if(typeof source==='object' && source.name && source.size){ /* source is file */
-		if(typeof window.FileReader!=='function')
-			throw new Error('Incompatible Browser');
-
 		this.fileName=source.name;
 		this.fileType=source.type;
 		this.fileSize=source.size;
-
-		this._fileReader=new FileReader();
-		this._fileReader.marcFile=this;
-		this._fileReader.addEventListener('load',function(){
-			this.marcFile._u8array=new Uint8Array(this.result);
-			this.marcFile._dataView=new DataView(this.result);
-
-			if(onLoad)
-				onLoad.call();
-		},false);
-
-		this._fileReader.readAsArrayBuffer(source);
-
-
-
+		try {
+			if (typeof window.FileReader !== 'function')
+				throw new Error('Incompatible Browser');
+			this._fileReader=new FileReader();
+			this._fileReader.addEventListener('load',function(){
+				this.marcFile._u8array=new Uint8Array(this.result);
+				this.marcFile._dataView=new DataView(this.result);
+
+				if(onLoad)
+					onLoad.call();
+			},false);
+
+
+			this._fileReader.marcFile=this;
+
+			this._fileReader.readAsArrayBuffer(source);
+		}catch (e){
+			if(!(e instanceof ReferenceError))
+				throw e;
+			this._fileReader = {}
+			this._u8array = new Uint8Array(source.data.buffer);
+			this._dataView=new DataView(source.data.buffer);
+			this.source = source;
+			MarcFile.prototype.readString = () => source.data.toString();
+		}
 	}else if(typeof source==='object' && typeof source.fileName==='string' && typeof source.littleEndian==='boolean'){ /* source is MarcFile */
 		this.fileName=source.fileName;
 		this.fileType=source.fileType;
@@ -127,22 +139,26 @@ MarcFile.prototype.copyToFile=function(target, offsetSource, len, offsetTarget){
 
 
 MarcFile.prototype.save=function(){
-	var blob;
-	try{
-		blob=new Blob([this._u8array],{type:this.fileType});
-	}catch(e){
-		//old browser, use BlobBuilder
-		window.BlobBuilder=window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
-		if(e.name==='InvalidStateError' && window.BlobBuilder){
-			var bb=new BlobBuilder();
-			bb.append(this._u8array.buffer);
-			blob=bb.getBlob(this.fileType);
-		}else{
-			throw new Error('Incompatible Browser');
-			return false;
+	if(typeof module !== "undefined" && module.exports)
+		require('fs').writeFileSync(this.fileName, Buffer.from(this._u8array.buffer));
+	else {
+		var blob;
+		try {
+			blob = new Blob([this._u8array], {type: this.fileType});
+		} catch (e) {
+			//old browser, use BlobBuilder
+			window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
+			if (e.name === 'InvalidStateError' && window.BlobBuilder) {
+				var bb = new BlobBuilder();
+				bb.append(this._u8array.buffer);
+				blob = bb.getBlob(this.fileType);
+			} else {
+				throw new Error('Incompatible Browser');
+				return false;
+			}
 		}
+		saveAs(blob, this.fileName);
 	}
-	saveAs(blob,this.fileName);
 }
 
 
diff --git a/js/cmd.js b/js/cmd.js
new file mode 100644
index 0000000..c3f4701
--- /dev/null
+++ b/js/cmd.js
@@ -0,0 +1,193 @@
+const {MarcFile} = require("./MarcFile");
+const {File} = require("./File")
+const {IPS_MAGIC, parseIPSFile} = require("./formats/ips")
+const {UPS_MAGIC, parseUPSFile} = require("./formats/ups")
+const {APS_N64_MAGIC, parseAPSFile} = require("./formats/aps_n64")
+const {APS_GBA_MAGIC, APSGBA} = require("./formats/aps_gba")
+const {BPS_MAGIC, parseBPSFile} = require("./formats/bps")
+const {RUP_MAGIC, parseRUPFile} = require("./formats/rup")
+const {PPF_MAGIC, parsePPFFile} = require("./formats/ppf")
+const {PMSR_MAGIC, parseMODFile} = require("./formats/pmsr")
+const {VCDIFF_MAGIC, parseVCDIFF} = require("./formats/vcdiff")
+const {ZIP_MAGIC, ZIPManager} = require("./formats/zip")
+const {md5} = require("./crc")
+
+function hasHeader(romFile){
+    if(romFile.fileSize<=0x600200){
+        if(romFile.fileSize%1024===0)
+            return 0;
+
+        for(var i=0; i<HEADERS_INFO.length; i++){
+            if(HEADERS_INFO[i][0].test(romFile.fileName) && (romFile.fileSize-HEADERS_INFO[i][1])%HEADERS_INFO[i][1]===0){
+                return HEADERS_INFO[i][1];
+            }
+        }
+    }
+    return 0;
+}
+function validateSource(patch, romFile){
+    if(patch && romFile && typeof patch.validateSource !== 'undefined'){
+        if(patch.validateSource(romFile, hasHeader(romFile))){
+            console.log('apply');
+        }else{
+            console.warn('apply'+ 'error_crc_input'+ 'warning');
+        }
+    }else{
+        console.log('valid source');
+    }
+}
+function _readPatchFile(patchFile, romFile){
+    patchFile.littleEndian=false;
+    let patch;
+    const header = patchFile.readString(6);
+    if(patchFile.getExtension()!=='jar' && header.startsWith(ZIP_MAGIC)){
+        patch=false;
+        validateSource();
+        ZIPManager.parseFile(patchFile);
+    }else{
+        if(header.startsWith(IPS_MAGIC)){
+            patch=parseIPSFile(patchFile);
+        }else if(header.startsWith(UPS_MAGIC)){
+            patch=parseUPSFile(patchFile);
+        }else if(header.startsWith(APS_N64_MAGIC)){
+            patch=parseAPSFile(patchFile);
+        }else if(header.startsWith(APS_GBA_MAGIC)){
+            patch=APSGBA.fromFile(patchFile);
+        }else if(header.startsWith(BPS_MAGIC)){
+            patch=parseBPSFile(patchFile);
+        }else if(header.startsWith(RUP_MAGIC)){
+            patch=parseRUPFile(patchFile);
+        }else if(header.startsWith(PPF_MAGIC)){
+            patch=parsePPFFile(patchFile);
+        }else if(header.startsWith(PMSR_MAGIC)){
+            patch=parseMODFile(patchFile);
+        }else if(header.startsWith(VCDIFF_MAGIC)){
+            patch=parseVCDIFF(patchFile);
+        }else{
+            patch=null;
+            console.log('apply'+ 'error_invalid_patch'+ 'error');
+        }
+
+        validateSource(patchFile, romFile);
+    }
+    return patch;
+}
+function preparePatchedRom(originalRom, patchedRom, headerSize) {
+    patchedRom.fileName = originalRom.fileName.replace(/\.([^\.]*?)$/, ' (patched).$1');
+    patchedRom.fileType = originalRom.fileType;
+    if (headerSize) {
+        if (el('checkbox-removeheader').checked) {
+            const patchedRomWithOldHeader = new MarcFile(headerSize + patchedRom.fileSize);
+            oldHeader.copyToFile(patchedRomWithOldHeader, 0);
+            patchedRom.copyToFile(patchedRomWithOldHeader, 0, patchedRom.fileSize, headerSize);
+            patchedRomWithOldHeader.fileName = patchedRom.fileName;
+            patchedRomWithOldHeader.fileType = patchedRom.fileType;
+            patchedRom = patchedRomWithOldHeader;
+        } else if (el('checkbox-addheader').checked) {
+            patchedRom = patchedRom.slice(headerSize);
+
+        }
+    }
+
+
+    /* fix checksum if needed */
+    // if (false) {
+    //     var checksumInfo = _getHeaderChecksumInfo(patchedRom);
+    //     if (checksumInfo && checksumInfo.current !== checksumInfo.calculated && confirm(_('fix_checksum_prompt') + ' (' + padZeroes(checksumInfo.current) + ' -> ' + padZeroes(checksumInfo.calculated) + ')')) {
+    //         checksumInfo.fix(patchedRom);
+    //     }
+    // }
+
+
+    console.log('apply');
+    patchedRom.save();
+}
+
+
+
+function padZeroes(intVal, nBytes){
+    var hexString=intVal.toString(16);
+    while(hexString.length<nBytes*2)
+        hexString='0'+hexString;
+    return hexString
+}
+
+/* CRC32 - from Alex - https://stackoverflow.com/a/18639999 */
+const CRC32_TABLE=(function(){
+    var c,crcTable=[];
+    for(var n=0;n<256;n++){
+        c=n;
+        for(var k=0;k<8;k++)
+            c=((c&1)?(0xedb88320^(c>>>1)):(c>>>1));
+        crcTable[n]=c;
+    }
+    return crcTable;
+}());
+function crc32(marcFile, headerSize, ignoreLast4Bytes){
+    var data=headerSize? new Uint8Array(marcFile._u8array.buffer, headerSize):marcFile._u8array;
+
+    var crc=0^(-1);
+
+    var len=ignoreLast4Bytes?data.length-4:data.length;
+    for(var i=0;i<len;i++)
+        crc=(crc>>>8)^CRC32_TABLE[(crc^data[i])&0xff];
+
+    return ((crc^(-1))>>>0);
+}
+function updateChecksums(file, romFile, startOffset, force){
+    if(file===romFile && file.fileSize>33554432 && !force){
+        console.log('File is too big.  Force calculate checksum?  Add -f to command');
+        return false;
+    }
+
+    console.log('crc32='+padZeroes(crc32(file, startOffset), 4));
+    console.log('md5='+padZeroes(md5(file, startOffset), 16));
+}
+let headerSize;
+
+function canHaveFakeHeader(romFile){
+    if(romFile.fileSize<=0x600000){
+        for(let i=0; i<HEADERS_INFO.length; i++){
+            if(HEADERS_INFO[i][0].test(romFile.fileName) && (romFile.fileSize%HEADERS_INFO[i][2]===0)){
+                return HEADERS_INFO[i][1];
+            }
+        }
+    }
+    return 0;
+}
+function _parseROM(romFile){
+    if(romFile.getExtension()!=='jar' && romFile.readString(4).startsWith(ZIP_MAGIC)){
+        ZIPManager.parseFile(romFile);
+    }else{
+        if(headerSize=canHaveFakeHeader(romFile)){
+            if(headerSize<1024){
+                console.log(headerSize+'b');
+            }else{
+                console.log(parseInt(headerSize/1024)+'kb');
+            }
+        }else if(headerSize=hasHeader(romFile)){
+            // do nothing
+        }else{
+            // do nothing
+        }
+
+        updateChecksums(romFile, 0);
+    }
+}
+const applyPatch = (patch, rom, validateChecksums) => {
+    rom = new MarcFile(new File(rom));
+    _parseROM(rom);
+    patch = new MarcFile(new File(patch));
+    patch = _readPatchFile(patch, rom);
+    if (!patch || !rom)
+        throw new Error('No ROM/patch selected');
+    console.log('apply'+ 'applying_patch'+ 'loading');
+
+    try {
+        preparePatchedRom(rom, patch.apply(rom, validateChecksums), headerSize);
+    } catch (e) {
+        // console.log('apply'+ 'Error: ' + (e.message)+ 'error');
+        throw e;
+    }
+}
+module.exports = {applyPatch}
\ No newline at end of file
diff --git a/js/crc.js b/js/crc.js
index 4c8240d..2a239d5 100644
--- a/js/crc.js
+++ b/js/crc.js
@@ -124,3 +124,7 @@ function crc16(marcFile, offset, len){
 
 	return crc & 0xffff;
 }
+
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {md5};
+}
\ No newline at end of file
diff --git a/js/formats/aps_gba.js b/js/formats/aps_gba.js
index cb1f43b..69ec897 100644
--- a/js/formats/aps_gba.js
+++ b/js/formats/aps_gba.js
@@ -4,7 +4,9 @@
 const APS_GBA_MAGIC='APS1';
 const APS_GBA_BLOCK_SIZE=0x010000; //64Kb
 const APS_GBA_RECORD_SIZE=4 + 2 + 2 + APS_GBA_BLOCK_SIZE;
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {APS_GBA_MAGIC, APSGBA};
+}
 function APSGBA(){
 	this.sourceSize=0;
 	this.targetSize=0;
diff --git a/js/formats/aps_n64.js b/js/formats/aps_n64.js
index b51efc2..bb8ecde 100644
--- a/js/formats/aps_n64.js
+++ b/js/formats/aps_n64.js
@@ -5,7 +5,9 @@ const APS_N64_MAGIC='APS10';
 const APS_RECORD_RLE=0x0000;
 const APS_RECORD_SIMPLE=0x01;
 const APS_N64_MODE=0x01;
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {APS_N64_MAGIC, parseAPSFile};
+}
 function APS(){
 	this.records=[];
 	this.headerType=0;
diff --git a/js/formats/bps.js b/js/formats/bps.js
index 839839d..f402638 100644
--- a/js/formats/bps.js
+++ b/js/formats/bps.js
@@ -6,7 +6,9 @@ const BPS_ACTION_SOURCE_READ=0;
 const BPS_ACTION_TARGET_READ=1;
 const BPS_ACTION_SOURCE_COPY=2;
 const BPS_ACTION_TARGET_COPY=3;
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {BPS_MAGIC, parseBPSFile};
+}
 
 function BPS(){
 	this.sourceSize=0;
diff --git a/js/formats/ips.js b/js/formats/ips.js
index 853ad6e..4ff5df8 100644
--- a/js/formats/ips.js
+++ b/js/formats/ips.js
@@ -1,13 +1,17 @@
 /* IPS module for Rom Patcher JS v20220417 - Marc Robledo 2016-2022 - http://www.marcrobledo.com/license */
 /* File format specification: http://www.smwiki.net/wiki/IPS_file_format */
 
-
-
 const IPS_MAGIC='PATCH';
 const IPS_MAX_SIZE=0x1000000; //16 megabytes
 const IPS_RECORD_RLE=0x0000;
 const IPS_RECORD_SIMPLE=0x01;
 
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {IPS_MAGIC, IPS_MAX_SIZE, IPS_RECORD_RLE, IPS_RECORD_SIMPLE, IPS, parseIPSFile};
+}
+
+
+
 function IPS(){
 	this.records=[];
 	this.truncate=false;
diff --git a/js/formats/pmsr.js b/js/formats/pmsr.js
index e4ba2e5..3986c72 100644
--- a/js/formats/pmsr.js
+++ b/js/formats/pmsr.js
@@ -5,7 +5,9 @@ const PMSR_MAGIC='PMSR';
 const YAY0_MAGIC='Yay0';
 const PAPER_MARIO_USA10_CRC32=0xa7f5cd7e;
 const PAPER_MARIO_USA10_FILE_SIZE=41943040;
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {PMSR_MAGIC, parseMODFile};
+}
 
 function PMSR(){
 	this.targetSize=0;
diff --git a/js/formats/ppf.js b/js/formats/ppf.js
index cf919d9..d3e0fc7 100644
--- a/js/formats/ppf.js
+++ b/js/formats/ppf.js
@@ -2,12 +2,14 @@
 /* File format specification: https://www.romhacking.net/utilities/353/  */
 
 
-
 const PPF_MAGIC='PPF';
 const PPF_IMAGETYPE_BIN=0x00;
 const PPF_IMAGETYPE_GI=0x01;
 const PPF_BEGIN_FILE_ID_DIZ_MAGIC='@BEG';//@BEGIN_FILE_ID.DIZ
 
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {PPF_MAGIC, parsePPFFile};
+}
 function PPF(){
 	this.version=3;
 	this.imageType=PPF_IMAGETYPE_BIN;
diff --git a/js/formats/rup.js b/js/formats/rup.js
index b123113..8d9f59a 100644
--- a/js/formats/rup.js
+++ b/js/formats/rup.js
@@ -6,7 +6,9 @@ const RUP_COMMAND_END=0x00;
 const RUP_COMMAND_OPEN_NEW_FILE=0x01;
 const RUP_COMMAND_XOR_RECORD=0x02;
 const RUP_ROM_TYPES=['raw','nes','fds','snes','n64','gb','sms','mega','pce','lynx'];
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {RUP_MAGIC, parseRUPFile};
+}
 
 function RUP(){
 	this.author='';
diff --git a/js/formats/ups.js b/js/formats/ups.js
index 9c5a8dd..46a6055 100644
--- a/js/formats/ups.js
+++ b/js/formats/ups.js
@@ -2,7 +2,9 @@
 /* File format specification: http://www.romhacking.net/documents/392/ */
 
 const UPS_MAGIC='UPS1';
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {UPS_MAGIC, UPS, parseUPSFile};
+}
 function UPS(){
 	this.records=[];
 	this.sizeInput=0;
diff --git a/js/formats/vcdiff.js b/js/formats/vcdiff.js
index b0584f2..485f1c1 100644
--- a/js/formats/vcdiff.js
+++ b/js/formats/vcdiff.js
@@ -6,7 +6,6 @@
 	some code and ideas borrowed from:
 	https://hack64.net/jscripts/libpatch.js?6
 */
-
 //const VCDIFF_MAGIC=0xd6c3c400;
 const VCDIFF_MAGIC='\xd6\xc3\xc4';
 /*
@@ -17,7 +16,10 @@ const XDELTA_100_MAGIC='%XDZ002';
 const XDELTA_104_MAGIC='%XDZ003';
 const XDELTA_110_MAGIC='%XDZ004';
 */
-
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {VCDIFF_MAGIC, parseVCDIFF};
+	MarcFile = require("../MarcFile").MarcFile;
+}
 
 function VCDIFF(patchFile){
 	this.file=patchFile;
diff --git a/js/formats/zip.js b/js/formats/zip.js
index f5c28f0..3ebdd39 100644
--- a/js/formats/zip.js
+++ b/js/formats/zip.js
@@ -2,6 +2,9 @@
 
 const ZIP_MAGIC='\x50\x4b\x03\x04';
 
+if(typeof module !== "undefined" && module.exports){
+	module.exports = {ZIP_MAGIC, ZIPManager};
+}
 var ZIPManager=(function(){
 	const FILTER_PATCHES=/\.(ips|ups|bps|aps|rup|ppf|mod|xdelta|vcdiff)$/i;
 	//const FILTER_ROMS=/(?<!\.(txt|diz|rtf|docx?|xlsx?|html?|pdf|jpe?g|gif|png|bmp|webp|zip|rar|7z))$/i; //negative lookbehind is not compatible with Safari https://stackoverflow.com/a/51568859
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..3d7a388
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,234 @@
+{
+  "name": "RomPatcher.js",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "chalk": "^5.2.0",
+        "commander": "^11.0.0",
+        "conf": "^11.0.1"
+      }
+    },
+    "node_modules/ajv": {
+      "version": "8.12.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
+      "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
+      "dependencies": {
+        "fast-deep-equal": "^3.1.1",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
+    "node_modules/ajv-formats": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-formats/-/ajv-formats-2.1.1.tgz",
+      "integrity": "sha512-Wx0Kx52hxE7C18hkMEggYlEifqWZtYaRgouJor+WMdPnQyEK13vgEWyVNup7SoeeoLMsr4kf5h6dOW11I15MUA==",
+      "dependencies": {
+        "ajv": "^8.0.0"
+      },
+      "peerDependencies": {
+        "ajv": "^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "ajv": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/atomically": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/atomically/-/atomically-2.0.1.tgz",
+      "integrity": "sha512-sxBhVZUFBFhqSAsYMM3X2oaUi2NVDJ8U026FsIusM8gYXls9AYs/eXzgGrufs1Qjpkxi9zunds+75QUFz+m7UQ==",
+      "dependencies": {
+        "stubborn-fs": "^1.2.4",
+        "when-exit": "^2.0.0"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "5.2.0",
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..ed2b7eb
--- /dev/null
+++ b/package.json
@@ -0,0 +1,17 @@
+{
+  "dependencies": {
+    "chalk": "^5.2.0",
+    "commander": "^11.0.0",
+    "conf": "^11.0.1"
+  },
+  "name": "rompatcher",
+  "description": "A ROM patcher made in HTML5.",
+  "version": "1.0.0",
+  "main": "index.js",
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "MIT"
+}