Jolt

Transformations are defined in JSON documents, making specs reusable, version-controllable, and more intuitive than imperative code, as emphasized in the philosophy section.

Transforms can be initialized once and reused across multiple threads, optimizing performance for web services, per the Performance notes in the README.

Multiple transforms like shift, default, and remove can be chained together via Chainr for complex restructuring, demonstrated in the unit test examples.

Focuses solely on reshaping JSON trees without value manipulation, making it efficient for pre-processing database outputs like ElasticSearch hits, as stated in the Overview.