javascript wad library
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Web Tool

Front-end tool for editing wads on the web.

Load a wad from your device, or by URL and view many different types of lumps.

Preview support includes:

  • Text files
  • Audio files
  • Midi files
  • Graphics (Doom Image Format, Flats, PNGs)
  • THINGS (displays thing count of Doom and Doom 2 types)


Javascript Library for manipulating Doom WAD format files

Read Doom WADs and access data from many different common lump types easily.

Current features include:

  • Loading WADs from local directories or URLs
  • Finding lumps in a WAD by name or index
  • Retrieving lump data as either text or binary data
  • Lump type detection (Common Text Data types, Mapdata, Graphics, Sprites, Flats, MIDI, MUS, and many more)
  • ENDOOM renderer (requires dos.png, a character map for the ASCII characters used)
  • PLAYPAL, COLORMAP renderer
  • Export Graphics and Flats to Canvas
  • Render Maps to Canvas


Follow the instructions here on how to install and use Grunt.

Install Browserify using npm with npm install -g browserify


Libraries for reading and manipulating doom wads exist in many languages, but not Javascript (until now). Exposing this access to the web can make for a much wider variety of interesting possibilities. Please make a cool web tool with this!


Load WAD file from desktop

In your HTML, any standard file input such as: <input type="file" id="fileInput"/>

And create a WAD object, and load the file like this:

var wad = Object.create(Wad); // Create a new WAD object to load our file into

// Create a callback function when loading is complete
wad.onLoad = function() {
  alert('Wad successfully loaded!');

var fileInput = document.getElementById('fileInput');
fileInput.addEventListener('change', function(e) {
  var file = fileInput.files[0];
  wad.load(file); // Load the file into the WAD object we created

Load WAD file from URL

Create a WAD object and load the URL

var wad = Object.create(Wad); // Create a new WAD object to load our file into

// Create a callback function when loading is complete
wad.onLoad = function() {
  alert('Wad successfully loaded!');



A directory of lump information is stored in wad.lumps, storing the names and also used internally to access the data of the lumps.

for (var i = 0; i < wad.lumps.length; i++) {
  console.log(wad.lumps[i].name); // Print the name of every lump in the WAD file.

These lump objects store name, size and pos (byte position in the WAD file). However, only the name will be useful for most cases.

To get the actual data for a lump, use the commands: wad.getLump(index) Return the lump data by index of the lump. wad.getLumpByName(name) Return the data of the first lump in the wad that matches name.

To ease finding lumps, there are some helper functions: wad.lumpExists(name) Returns true if a lump in the wad exists with the given name. wad.getLumpIndexByName(name) Just returns the index of the first lump matching the given name, instead of the entire data of the lump. wad.getLumpAsText(index) Return the lump data as a string instead of byte data.

Lump interfaces


Doom uses a custom image format for most of the graphics in the game. These can be automatically converted to standard images by wad.js.


graphic = Object.create(Graphic); // We create Graphic objects just like Wad object files
graphic.load(wad.getLumpByName('PLAYA1'); // Load the player sprite from DOOM2.WAD
canvas = graphic.toCanvas(); // Export the image to a HTML5 canvas
document.body.appendChild(canvas); // Place the image on the page


Flats are another image format used in Doom games, for sector floors and ceilings. The API matches the graphic format API.

flat = Object.create(Flat); Create a new Flat object flat.load(data); Load lump data into flat object flat.toCanvas(); Return new canvas object with the flat's data rendered to it


The PLAYPAL lump is the palette used in the Doom wad, present in the IWAD files. If no PLAYPAL is present, a copy of the DOOM/2.WAD palette is used internally for graphics rendering.

playpal = Object.Create(Playpal); Create a new Playpal object playpal.load(data); Load lump data into playpal object playpal.toCanvas(); Render playpal to a canvas object and return it


The COLORMAP lump is used in Doom for lighting effects. It is an indexed list for each color in the palette with a ramp to darkness.

colormap = Object.Create(Colormap); Create a new Colormap object colormap.load(data); Load lump data into colormap object colormap.toCanvas(); Render the colormap to a canvas object and return it