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Sync Details

This page aims to describe how Rojo turns files on the filesystem into Roblox objects.


File Name Instance Type
any directory Folder
*.server.lua Script
*.client.lua LocalScript
*.lua ModuleScript
*.csv LocalizationTable
*.txt StringValue
*.model.json Any
*.rbxm Any
*.rbxmx Any
*.meta.json Modifies another instance


Not all property types can be synced by Rojo in real-time due to limitations of the Roblox Studio plugin API. In these cases, you can usually generate a place file and open it when you start working on a project.

Some common cases you might hit are:

  • Binary data (Terrain, CSG, CollectionService tags)
  • MeshPart.MeshId
  • HttpService.HttpEnabled

For a list of all property types that Rojo can reason about, both when live-syncing and when building place files, look at rbx-dom's type coverage chart.

This limitation may be solved by issue #205 in the future.


Any directory on the filesystem will turn into a Folder instance unless it contains an 'init' script, described below.


The default script type in Rojo projects is ModuleScript, since most scripts in well-structued Roblox projects will be modules.

If a directory contains a file named init.server.lua, init.client.lua, or init.lua, that folder will be transformed into a *Script instance with the contents of the 'init' file. This can be used to create scripts inside of scripts.

For example, these files:

Tree of files on disk

Will turn into these instances in Roblox:

Tree of instances in Roblox

Localization Tables

Any CSV files are transformed into LocalizationTable instances. Rojo expects these files to follow the same format that Roblox does when importing and exporting localization information.

Plain Text Files

Plain text files (.txt) files are transformed into StringValue instances. This is useful for bringing in text data that can be read by scripts at runtime.

JSON Models

Files ending in .model.json can be used to describe simple models. They're designed to be hand-written and are useful for instances like RemoteEvent.

A JSON model describing a folder containing a Part and a RemoteEvent could be described as:

    "Name": "My Cool Model",
    "ClassName": "Folder",
    "Children": [
            "Name": "RootPart",
            "ClassName": "Part",
            "Properties": {
                "Size": {
                    "Type": "Vector3",
                    "Value": [4, 4, 4]
            "Name": "SendMoney",
            "ClassName": "RemoteEvent"

It would turn into instances in this shape:

Tree of instances in Roblox


Starting in Rojo 0.5.0 (stable), the Name field is no longer required. The name of the top-level instance in a JSON model is now based on its file name, and the Name field is now ignored.

Rojo will emit a warning if the Name field is specified and does not match the file's name.

Binary and XML Models

Rojo supports both binary (.rbxm) and XML (.rbxmx) models generated by Roblox Studio or another tool.

Support for the rbxmx is very good, while support for rbxm is still very early, buggy, and lacking features.

For a rundown of supported types, check out rbx-dom's type coverage chart.

Meta Files

New in Rojo 0.5.0-alpha.12 are meta files, named .meta.json.

Meta files allow attaching extra Rojo data to models defined in other formats, like Roblox's rbxm and rbxmx model formats, or even Lua scripts.

This can be used to set Rojo-specific settings like ignoreUnknownInstances, or can be used to set properties like Disabled on a script.

Meta files can contain:

  • className: Changes the className of a containing Folder into something else.
    • Usable only in init.meta.json files
  • properties: A map of properties to set on the instance, just like projects
    • Usable on anything except .rbxmx, .rbxm, and .model.json files, which already have properties
  • ignoreUnknownInstances: Works just like $ignoreUnknownInstances in project files

Meta Files to set Rojo metadata

Sometimes it's useful to apply properties like ignoreUnknownInstances on instances that are defined on the filesystem instead of within the project itself.

If your project has hello.txt and there are instances underneath it that you want Rojo to ignore when live-syncing, you could create hello.meta.json with:

    "ignoreUnknownInstances": true

Meta Files for Disabled Scripts

Meta files can be used to set properties on Script instances, like Disabled.

If your project has foo.server.lua and you want to make sure it would be disabled, you could create a foo.meta.json next to it with:

    "properties": {
        "Disabled": true

Meta Files for Tools

If you wanted to represent a tool containing a script and a model for its handle, create a directory with an init.meta.json file in it:

    "className": "Tool",
    "properties": {
        "Grip": [
            0, 0, 0,
            1, 0, 0,
            0, 1, 0,
            0, 0, 1

Instead of a Folder instance, you'll end up with a Tool instance with the Grip property set!