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File:Mix logo.png
Elixir Mix

Mix is a build tool and dependency management system for Elixir, a dynamic, functional programming language built on top of the Erlang Virtual Machine (BEAM). It is designed to simplify the process of creating, compiling, and managing Elixir projects.


Mix provides a wide range of features that aid in the development and maintenance of Elixir projects. Some of its key features include:

  • Project Generation: Mix enables developers to generate new projects effortlessly with a single command.
  • Dependency Management: Mix manages project dependencies, allowing developers to easily specify and update external libraries and dependencies.
  • Compilation: Mix compiles Elixir source code into bytecode that can be executed by the Erlang Virtual Machine.
  • Testing: Mix provides a robust testing framework, making it simple to write and run tests for Elixir applications.
  • Documentation: Mix facilitates the generation of project documentation, allowing developers to automatically generate API documentation from their code.
  • Task Execution: Mix supports the execution of custom tasks, making it easy to define and run project-specific tasks.


Mix is a command-line tool and can be used by running the `mix` command followed by the desired task or mix task options.

Here are some commonly used mix tasks:

  • `mix new <project_name>`: Creates a new Elixir project with the specified name.
  • `mix deps.get`: Retrieves and installs the project dependencies.
  • `mix compile`: Compiles the Elixir source code into bytecode.
  • `mix test`: Runs the project's tests.
  • `mix run <module.function>`: Executes an Elixir module function.
  • `mix docs`: Generates project documentation.
  • `mix help <task>`: Provides detailed information and usage examples for a specific mix task.


Mix allows developers to configure various aspects of their projects. The configuration is defined in the `mix.exs` file located in the project's root directory. This file is written in Elixir and allows developers to set project-specific options, dependencies, and other settings.

Key configurations include:

  • `project`: Defines project-specific information such as project name, version, and dependencies.
  • `app`: Specifies the main application module to be started when the project runs.
  • `deps`: Lists the external dependencies required by the project.
  • `aliases`: Defines custom mix tasks or aliases that can be executed using `mix <alias_name>`.


Mix plays an essential role in the Elixir development ecosystem, providing developers with powerful tools to simplify project management, compilation, testing, and more. Its intuitive interface and extensive feature set make it an indispensable tool for Elixir developers around the world.

See Also[edit]

  • Elixir - The programming language that Mix is built upon.
  • Erlang - The underlying Virtual Machine that powers Elixir and Mix.