json4s/json4s

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1485 stars · 324 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

4s is a Scala JSON library providing a common JSON AST (JValue) with parsing, formatting, and transformation utilities. It originated as a fork of lift- and offers both a native parser and a Jackson-backed parser.

Use cases

• parse in scala
• serialize case classes to
• query and transform documents with xpath-like expressions
• convert between and xml
• diff and merge documents
• use jackson with a lift- style ast

When to choose

• you need a shared JSON AST across Scala libraries
• you want case class extraction from parsed JSON
• you need XML-to-JSON conversion or diff/merge features
• you prefer lift-'s API without Lift's release cycle

When to avoid

• you want the fastest possible JSON parsing in Scala (consider circe or jackson directly)
• you need typeclass-based JSON codecs with strong compile-time guarantees
• you are not working on the JVM or with Scala

Facets

library · maturity stable

serialization parser developer-tools backend web-development jvm scala jackson -ast lift- case-class-extraction

Member repositories

For agents

markdown · JSON · MCP: product_card(name="json4s/json4s")