A JSON library for Scala and Scala.js with a focus on functional programming and type safety.
Circe is a JSON library for Scala and Scala.js that provides functional, type-safe tools for parsing, manipulating, and serializing JSON data. It solves the problem of handling JSON in Scala applications with a focus on correctness, performance, and seamless integration with Scala's type system and functional programming patterns.
Scala developers building applications that require JSON serialization/deserialization, especially those using functional programming patterns or targeting both JVM and Scala.js environments.
Developers choose Circe for its strong type safety, functional design, excellent performance via Jawn, and extensive ecosystem of integrations with popular Scala libraries like Akka, http4s, and Finch.
Yet another JSON library for Scala
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Leverages Scala's type system to catch JSON parsing errors at compile time, reducing runtime issues, as emphasized in the key features for type safety.
Provides automatic derivation of encoders and decoders for case classes and sealed traits, simplifying serialization without manual boilerplate.
Uses Jawn for fast JSON parsing, enabling efficient handling of high-throughput scenarios, as evidenced by adopters like Criteo processing hundreds of thousands of events per second.
Has a modular architecture with support for custom encoders and integrations with many Scala libraries, such as Akka, http4s, and Finch, shown in the extensive related projects list.
Requires familiarity with Scala's type system and functional programming patterns, which can be challenging for developers new to these concepts, limiting accessibility.
Automatic derivation can lead to longer compile times for complex types, as indicated by the experimental circe-derivation project aimed at improving compile times.
Limited to JSON format; additional libraries like circe-yaml are needed for other data serialization, adding complexity for multi-format projects.