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wtf is shapeless?

sh0hei/shapeless — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2026-02-13

ScalaAudience · developerComplexity · 4/5MaintainedSetup · moderate

TL;DR

Shapeless is a Scala library that lets developers write data-handling logic once and automatically reuse it for any data type, cutting out repetitive boilerplate code.

Mindmap

mindmap
  root((Shapeless))
    What it does
      Less boilerplate
      Reusable data logic
      Compile-time generation
    How it works
      Type system introspection
      Case class structure
      No runtime cost
    Use cases
      JSON conversion
      Equality checks
      Database mapping
    Audience
      Scala developers
      Library authors
    Status
      Mature
      Production-used
      Active community

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Automatically generate JSON conversion, equality checks, or serialization code for any Scala case class without writing it by hand for each one.

REASON 2

Build a library that needs to work flexibly with user-defined data structures without knowing their shape in advance.

REASON 3

Eliminate repeated boilerplate when the same logic pattern needs to apply across many different data types.

What's in the stack?

Scala

How it stacks up

sh0hei/shapelesscakiki/databasejanikdotzel/akka-http-quickstart-scala
LanguageScalaScalaScala
Last pushed2026-02-132026-03-132023-05-19
MaintenanceMaintainedMaintainedDormant
Setup difficultymoderateeasyeasy
Complexity4/52/52/5
Audiencedeveloperresearcherdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 1h+

Requires familiarity with Scala's type system, the compile-time metaprogramming style has a learning curve.

Yoink these prompts

Prompt 1
Show me how to use Shapeless to automatically derive JSON encoding for a Scala case class.
Prompt 2
Help me understand how Shapeless inspects a case class's fields at compile time to generate reusable code.
Prompt 3
I'm writing a Scala library that needs to work with arbitrary case classes. How can Shapeless help me avoid writing type-specific code?
Prompt 4
Walk me through a beginner-friendly example of using Shapeless to compare two case class instances for equality.

Frequently asked questions

wtf is shapeless?

Shapeless is a Scala library that lets developers write data-handling logic once and automatically reuse it for any data type, cutting out repetitive boilerplate code.

What language is shapeless written in?

Mainly Scala. The stack also includes Scala.

Is shapeless actively maintained?

Maintained — commit in last 6 months (last push 2026-02-13).

How hard is shapeless to set up?

Setup difficulty is rated moderate, with roughly 1h+ to a first successful run.

Who is shapeless for?

Mainly developer.

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