UTY Save Editor

A save editor for the Undertale fangame Undertale Yellow.

Usage

The save editor is currently available on uty-save-editor.netlify.app. It has not been thoroughly tested and there may be bugs. Did you find an error which you don't understand? Do you want to propose a feature which is missing? Does something not seem very logical or obvious to you when using the editor? Then please open an issue for your feedback! I don't guarantee the fixes will always be fast, but I can try my best.

Features

Supports all 4 types of save files (main save, persistent data, temporary save and game config)
Can edit most important fields of the main save file
Can edit most fields of other save files
Fancy location picker which lets you visually select your location!
Fun value picker! (You no longer need to remember what does each fun value mean.)
Editing of GameMaker DS lists! (which are normally unreadable through a text editor)
- For example, Dimensional Box items, Fast Travel locations...
Templates for save files! You can get save files for the most important moments (such as the Pacifist final battle) in the game right through the editor, and then modify them to your desire.
Helps you fix your Genocide Route save file that you accidentally aborted before Axis by not exhausting the kill counter before it was to late.
Helpful explanations of some options
Tries to make you not shoot your foot while editing as much as possible
Steamworks ID editing! (I bet you didn't need it)

How can I help?

There are several ways in which you could help:

Use the editor: while using it, you can spot bugs and other issues with it and report them as issues.
Do research: there are many flags in the game which are not documented publicly yet. Research into the save file structure is currently available in this repository's research directory, and more thorough research into some flags is available here. If we discover the entire structure of the save file, it makes implementing its editing much easier!
Curate save files: there are some save file repositories (such as this one) available, which could be used to curate the save files for the editor. What that means is to pick the save files for the most important moments, optimize their equipment to a reasonable extent and add them as templates to the editor. This way, users will be able to pick a predefined moment in the game to start from, while changing it the way they like.
Add features: you can also help develop new features for the save editor! Please consult the section below on how to get started with development.

Development

You will need Node.js, Git and Git LFS to run the site locally. After their installation, clone the repository using:

$ git clone https://github.com/KockaAdmiralac/uty-save-editor.git

then install the site's dependencies (while ignoring all "security" warnings) using:

$ npm install

and then you can run a local instance of the site on localhost:3000 using:

$ npm start