Configuration File

From v0.4.3, JuliaFormatter offers .prettierrc style configuration file support. This means you can specify formatting options shown in format_text in .JuliaFormatter.toml file and share that with others.

When format is called, it will look for .JuliaFormatter.toml in the location of the file being formatted, and searching up the file tree until a config file is (or isn't) found. When found, the configurations in the file will overwrite the given options.


Juno, a Julia IDE that offers formatting feature using this package, also respects configuration file. When you use Julia-Client: Format-Code command, Juno will automatically search for a configuration file with the same rule as format does from the directory of current editor.

Basic Configuration

In .JuliaFormatter.toml, you can specify any of the formatting options shown in format_text in TOML, e.g. if you have


indent = 2
margin = 100

then files under somedir will be formatted with 2 spaces indentation and the maximum line length 100.

Custom Style

Currently the configuration file doesn't support user-defined Custom Styles. For the time being, we only provide specs for YAS Style, Blue Style and SciML in configuration file. In order to use YAS style instead of the default style, you can just specify:


style = "yas"

In the same way as above, you can specify style = "blue" to use Blue style.

Search Rule

.JuliaFormatter.toml will be searched up from the directory of the file being formatted. So if you have:

├─ .JuliaFormatter.toml
├─ code.jl
└─ subdir
   └─ sub_code.jl

then format("subdir/sub_code.jl") will be automatically configured by the dir/.JuliaFormatter.toml, as well as format("dir") will format both dir/code.jl and dir/subdir/sub_code.jl according to the same configuration.

What will happen when we have multiple .JuliaFormatter.toml files ? In that case, the deepest configuration has the precedence. For example, if you have

├─ .JuliaFormatter.toml
├─ code.jl
├─ subdir1
│  ├─ .JuliaFormatter.toml
│  └─ sub_code1.jl
└─ subdir2
   └─ sub_code2.jl

and call format("dir"), code.jl and sub_code2.jl will be formatted according to the rules defined in dir/.JuliaFormatter.toml, while formatting sub_code1.jl will be configured by dir/subdir1/.JuliaFormatter.toml.

Ignoring specific files and directories

If there is an entry in .JuliaFormatter.toml with

ignore = ["file.jl", "directory", "file_*.jl"]

then all of these files will be reported as already formatted: ./file.jl, ./directory/something.jl ./other_directory/file.jl, file_1.jl, .other_directory/file_name.jl.