This is a Scala implementation of a JSON Schema validator based upon the great io.circe Library.

Note: the validator is in early state and API may not be stable.

• Implementing JSON Schema 2020-12, 2019-09
• All tests of the JSON Schema Test Suite passing
• You can bring your own Downloader (using Tagless Final Pattern)
• Support for Scala 2.12, 2.13 and 3

• dynamicRef and dynamicAnchor are very rough implemented
• Unknown Keywords are ignored and won't be serialized again.
• Only JSON Schema 2020-12, 2019-09 and one Circe-Version supported so far.
• The API will only be stable in patch versions

Regex Patterns are directly given to java.util.regex.Pattern.compile. This could be not secure and could lead to ReDoS Attacks. Do not trust JSON schemas from an untrusted source.

Only use this library for trusted JSON-Schemas

This is BETA-Software. Use at your own risk.

Please have a look in the examples folder for some Examples.

There are some main Types

• Json the JSON Representation of the Circe-Library.
• Schema represents a single JSON-Schema and can be parsed from Json.
• Validator a single validator validating some JSON
• ValidationResult the result of a validation, contains possible violations.
• DocumentValidator a validator for a full set of JSON-Schema-Documents. This is what you want to use for Validating
• SingleDocumentValidator representing a single document within DocumentValidator
• Loader the main entry point to load and parse JSON-Schemas, which provide a DocumentValidator for you.
• Downloader during resolving, it is possible, that additional URLs need to be downloaded. The downloader is responsible for that and you can bring your own. There exists a dummy implementation which doesn't download anything Downloader.emptySimple and an implementation which is using Java-URL-Facilities Downloader.JavaUrlDownloader

The library is released under terms of Apache License 2.0

3rdparty contans 3rd-Party references

• JSON-Schema-Test-Suite, licensed under terms of MIT-License
• schema contains the JSON Schemas of JSON Schema, released unter terms of BSD-License.