bazaarvoice/jolt

Health v2 · maintenance only

Adoption not part of the score

1675 stars · 350 forks observed · 2026-08-28

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

Jolt is a Java library for JSON-to-JSON transformation where the transform specification is itself a JSON document. It provides chained stock transforms (shift, default, remove, sort, cardinality) that reshape JSON structure, with extension points for custom Java value manipulation.

Use cases

• transform JSON responses from Elasticsearch, MongoDB, or Cassandra before exposing them
• reshape API payloads to match another service's expected schema
• extract a subset of fields from large JSON documents
• apply default values to missing JSON fields declaratively
• normalize inconsistent JSON structures like single object vs list cardinality
• define data mappings as JSON specs instead of writing Java mapping code

When to choose

• you need declarative, spec-driven structural transformation of JSON on the JVM
• you want transform logic that is data (JSON) rather than compiled code
• you need to chain multiple structural operations like shift, default, and remove
• your team wants non-developers to review or edit mapping specs

When to avoid

• you need heavy per-value computation or business logic inside the transform
• you are not on the JVM and cannot run Java
• you need streaming transformation of very large JSON documents rather than in-memory trees
• you want a visual GUI mapping tool rather than a JSON DSL

Facets

library · maturity stable

serialization developer-tools developer-tools apis jvm cli -transformation -to- spec-driven data-mapping etl data-engineering

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