JuliaFormatter.jl

June 25, 2026 ยท View on GitHub

Documenter: stable Build Status

Width-sensitive formatter for Julia code. Inspired by gofmt, refmt, and black.

Note

In JuliaFormatter v2, SciMLStyle and YASStyle still have a number of rough edges. If you are using these styles please consider using v1 of JuliaFormatter.

Default and Blue styles should largely be stable from v2.10 onwards.

See also the Project Status section of the docs for more details.

Installation

pkg> add JuliaFormatter

Quick Start

julia> using JuliaFormatter

# Recursively formats all Julia files in the current directory
julia> format(".")

# Formats an individual file
julia> format_file("foo.jl")

# Formats a string (contents of a Julia file)
julia> format_text(str)

Check out the docs for further description of the formatter and its options.

Command Line Tool

Starting from version 2.2.0, JuliaFormatter provides a command-line executable jlfmt.

To install:

pkg> app add JuliaFormatter

Usage:

# Format a file and write to stdout
jlfmt src/file.jl

# Format a file in place
jlfmt --inplace src/file.jl

# Check if all files in a directory are already formatted with verbose mode
jlfmt --check -v src/

# Format all files in a directory with multiple threads
jlfmt --threads=6 -- --inplace -v src/

# Show diff without modifying files
jlfmt --diff src/file.jl

Run jlfmt --help for more options.

Check out the CLI docs for further description of the formatter and its options.