Modding:Content Patcher

Creating Content Patcher packs

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Do you want to create Content Patcher packs for Stardew Valley? This guide is for you! For using mods, see Modding:Player Guide.

Quick start

This guide is meant as a gentle introduction to creating Content Patcher packs. If you don't need a gentle introduction, see the full Content Patcher readme.

Basic concepts

What is Content Patcher?

Content Patcher is a SMAPI mod which lets you change the game assets (images, dialogue, data, and maps) without replacing game files or writing code. You use it by creating a content pack (basically a folder) with a couple of JSON files (basically text). Just by editing a JSON file, you can...

• replace one image file;
• make seasonal changes;
• make dialogue that changes based on the weather, date, your relationships with other NPCs, etc;
• make very specific changes (like coffee is more expensive on winter weekends when it's snowing after you've completed the JojaMart);
• and much more.

Assets

An asset is essentially a file in the Content folder with a unique asset name. The asset name never includes the Content path, language, or file extension (you can use tokens to target specific languages). For example:

file	asset name
Content/Portraits/Abigail.xnb	Portraits/Abigail
Content/Maps/spring_beach.xnb Content/Maps/spring_beach.es-ES.xnb Content/Maps/spring_beach.fr-FR.xnb	Maps/spring_beach

An asset may contain multiple sprites or data entries. For example, here's what Portraits/Abigail contains if you unpack it:

So if you wanted to change Abigail's portraits, you would use Content Patcher to load or edit Portraits/Abigail.

Load vs edits

There are two conceptual ways you can change an asset:

• Load the initial version of an asset. Each asset can only be loaded by one mod at the same time. This is mainly useful for total replacement mods (like a mod that completely changes an NPC's portraits), or to provide files that don't exist in the Content folder.
• Edit an asset after it's loaded. Any number of edits can be applied to the same asset.

For example, let's say the game needs Abigail's portraits. This is how changes are applied:

                                          ┌────────────┐
                                          │ edit asset │
                         ┌───────────┐    ├────────────┤
get Portraits/Abigail ──>│ load file │───>│ edit asset │──> portrait asset
                         └───────────┘    ├────────────┤
                                          │ edit asset │
                                          └────────────┘

This is divided into four different action types (Load, EditImage, EditData, EditMap), which is explained in more detail on the following pages.

Get started

First let's get our basic content pack up and running:

1. Install SMAPI and Content Patcher.
2. Unpack the game's Content folder so you can see what each asset contains (see Modding:Editing XNB files#Unpack game files).
3. Create a SMAPI content pack.
4. Create a content.json file in the same folder this content:

   {
      "Format": "1.9",
      "Changes": [
      ]
   }
   

5. Launch the game.

If you did everything correctly so far, you should see the new mod under "Loaded X content packs" in the SMAPI console! (If not, review the above steps or come ask for help.)

Next steps

You've created a Content Patcher pack! Next we'll make it do something. This tutorial will walk you through creating Blueberries Everywhere, a mod which just turns various things into blueberries.

When you're ready to continue, see the navigation at the bottom of the page to continue.

See also

• Content Patcher readme for the full technical reference, known limitations, FAQs, etc

Load assets →