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The com-lihaoyi Scala Platform 🇸🇬

The com-lihaoyi platform lets you write Scala in an easy and productive way while delivering real business value. It provides all the core building blocks a typical software engineer needs day to day: HTTP clients and servers, JSON/binary data serialization, filesystem operations, CLI argument parsing, build tooling, etc. These can be combined in a variety of ways to perform many useful real-world tasks:

The com-lihaoyi organization maintains an ongoing issue bounty program, paying out 100s to 1000s of USD for the completion of various issues. See the up-to-date listing here:

The com-lihaoyi projects are all open source, but if you want to learn more about writing Scala in the easy and productive way, you check out the following book:

Hands-on Scala Programming also comes with over 150 worked examples that demonstrate how to use Scala with the com-lihaoyi projects in a wide variety of real scenarios:

These examples are free to browse online, and are a great way to kickstart your next application, project or business using the Scala programming language.

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  1. cask cask Public

    Cask: a Scala HTTP micro-framework. Cask makes it easy to set up a website, backend server, or REST API using Scala

    Scala 564 64

  2. scalasql scalasql Public

    Scala ORM to query SQL databases from Scala via concise, type-safe, and familiar case classes and collection operations. Connects to Postgres, MySql, H2, and Sqlite out of the box

    Scala 228 30

  3. Ammonite Ammonite Public

    Scala Scripting

    Scala 2.6k 372

  4. mill mill Public

    Mill is a fast JVM build tool that supports Java, Scala, Kotlin and many other languages. 3-6x faster than Maven or Gradle for common workflows, Mill aims to make your project’s build process perfo…

    Scala 2.5k 406

  5. mainargs mainargs Public

    A small, convenient, dependency-free library for command-line argument parsing in Scala

    Scala 200 26

  6. requests-scala requests-scala Public

    A Scala port of the popular Python Requests HTTP client: flexible, intuitive, and straightforward to use.

    Scala 736 88

Repositories

Showing 10 of 23 repositories
  • mill Public

    Mill is a fast JVM build tool that supports Java, Scala, Kotlin and many other languages. 3-6x faster than Maven or Gradle for common workflows, Mill aims to make your project’s build process performant, maintainable, and flexible

    com-lihaoyi/mill’s past year of commit activity
    Scala 2,457 MIT 406 150 39 Updated Jun 18, 2025
  • os-lib Public

    OS-Lib is a simple, flexible, high-performance Scala interface to common OS filesystem and subprocess APIs

    com-lihaoyi/os-lib’s past year of commit activity
    Scala 720 80 17 18 Updated Jun 17, 2025
  • PPrint Public

    Pretty-printing value, types and type-signatures in Scala

    com-lihaoyi/PPrint’s past year of commit activity
    Scala 240 MIT 41 14 21 Updated Jun 15, 2025
  • mill-moduledefs Public

    Scalac compiler plugin to support Mill modules

    com-lihaoyi/mill-moduledefs’s past year of commit activity
    Scala 7 MIT 4 1 2 Updated Jun 15, 2025
  • scalasql Public

    Scala ORM to query SQL databases from Scala via concise, type-safe, and familiar case classes and collection operations. Connects to Postgres, MySql, H2, and Sqlite out of the box

    com-lihaoyi/scalasql’s past year of commit activity
    Scala 228 30 10 4 Updated May 31, 2025
  • fansi Public

    Scala/Scala.js library for manipulating Fancy Ansi colored strings

    com-lihaoyi/fansi’s past year of commit activity
    Scala 231 26 9 17 Updated May 30, 2025
  • geny Public

    Provides the geny.Generator data type, the dual to a scala.Iterator that can ensure resource cleanup

    com-lihaoyi/geny’s past year of commit activity
    Scala 96 25 1 15 Updated May 30, 2025
  • cask Public

    Cask: a Scala HTTP micro-framework. Cask makes it easy to set up a website, backend server, or REST API using Scala

    com-lihaoyi/cask’s past year of commit activity
    Scala 564 64 6 5 Updated May 30, 2025
  • utest Public

    A simple testing framework for Scala

    com-lihaoyi/utest’s past year of commit activity
    Scala 496 MIT 86 30 8 Updated May 30, 2025
  • fastparse Public

    Writing Fast Parsers Fast in Scala

    com-lihaoyi/fastparse’s past year of commit activity
    Scala 1,112 MIT 167 16 6 Updated May 30, 2025