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The lihaoyi Scala Platform 🇸🇬

The 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:

Latest Projects Versions

  • : a better build tool for Java, Scala, and Kotlin
  • : a library for interfacing with common OS filesystem and subprocess APIs
  • : a Scala port of the popular Python Requests HTTP client
  • : a simple, fast, dependency-free JSON & Binary serialization library
  • : an ORM to query SQL databases via concise and familiar collection operations
  • : a HTTP micro-framework for websites, backend servers, or REST APIs
  • : a small, convenient, dependency-free library for command-line argument parsing
  • : a library for easily writing high-performance parsers
  • : a simple testing framework
  • : a library for pretty-printing values, types and type-signatures
  • : a library providing "source" metadata to your program
  • : a library for manipulating Fancy Ansi colored strings
  • : interfaces for manipulating streaming collections and bytestreams

Bounties

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 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:

Learn Scala

Hands-on Scala Programming also comes with over 150 worked examples that demonstrate how to use Scala with the 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.

Pinned Loading

  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 593 67

  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 260 36

  3. Ammonite Ammonite Public

    Scala Scripting

    Scala 2.6k 366

  4. mill mill Public

    A better build tool for Java, Scala and Kotlin: Simpler than Maven, easier than Gradle, with 3-7x faster dev workflows than other JVM build tools

    Scala 2.8k 446

  5. mainargs mainargs Public

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

    Scala 215 27

  6. requests-scala requests-scala Public

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

    Scala 751 98

Repositories

Showing 10 of 24 repositories
  • mill Public

    A better build tool for Java, Scala and Kotlin: Simpler than Maven, easier than Gradle, with 3-7x faster dev workflows than other JVM build tools

    Scala 2,790 MIT 446 177 92 Updated Sep 11, 2026
  • 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 260 MIT 36 23 3 Updated Sep 3, 2026
  • Ammonite Public

    Scala Scripting

    com-lihaoyi/Ammonite's past year of commit activity
    Scala 2,629 MIT 366 127 38 Updated Aug 31, 2026
  • 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 Aug 29, 2026
  • fastparse Public

    Writing Fast Parsers Fast in Scala

    com-lihaoyi/fastparse's past year of commit activity
    Scala 1,134 MIT 164 18 5 Updated Aug 20, 2026
  • 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 742 89 20 22 Updated Jun 1, 2026
  • PPrint Public

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

    com-lihaoyi/PPrint's past year of commit activity
    Scala 248 MIT 42 12 8 Updated May 28, 2026
  • castor Public

    Castor is a lightweight, typed Actor library for Scala and Scala.js

    com-lihaoyi/castor's past year of commit activity
    Scala 149 13 2 15 Updated Apr 10, 2026
  • requests-scala Public

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

    com-lihaoyi/requests-scala's past year of commit activity
    Scala 751 98 16 20 Updated Apr 1, 2026
  • acyclic Public

    Acyclic is a Scala compiler plugin to let you prohibit circular dependencies between files

    com-lihaoyi/acyclic's past year of commit activity
    Scala 250 MIT 37 9 3 Updated Mar 31, 2026

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