alterschema

A language-independent tool to automatically transform JSON Schema documents across specification versions (Draft 3 to 2020-12). Version 1.1.3 is the latest stable release. Developed by Sourcemeta, it provides lossless, transitive transformations and a JavaScript binding. Differentiates from other converters by offering formal one-to-one rule mappings and a web playground at alterschema.sourcemeta.com. Supports lossless upgrades from 2019-09 to 2020-12, Draft 7 to 2019-09, etc. Designed for compatibility with JSON Schema validators.