This multiplatform library is an implementation of JSON schema that can validate JsonElement from kotlinx.serialization-json library.

In order to use releases add Maven Central repository to the list of repositories.

repositories { mavenCentral() } implementation("io.github.optimumcode:json-schema-validator:0.0.1")

repositories { mavenCentral() } implementation 'io.github.optimumcode:json-schema-validator:0.0.1'

Release are published to Sonatype repository. The synchronization with Maven Central takes time. If you want to use the release right after the publication you should add Sonatype Release repository to your build script.

repositories { maven(url = "https://s01.oss.sonatype.org/content/repositories/releases/") }

repositories { maven { url 'https://s01.oss.sonatype.org/content/repositories/releases/' } }

If you want to use SNAPSHOT version you should add Sonatype Snapshot repository to your build script.

repositories { maven(url = "https://s01.oss.sonatype.org/content/repositories/snapshots") } implementation("io.github.optimumcode:json-schema-validator:0.0.1-SNAPSHOT")

repositories { maven { url 'https://s01.oss.sonatype.org/content/repositories/snapshots' } } implementation 'io.github.optimumcode:json-schema-validator:0.0.1-SNAPSHOT'

import io.github.optimumcode.json.schema.JsonSchema import io.github.optimumcode.json.schema.ValidationError import kotlinx.serialization.json.JsonElement val key = "\$" // to use $ in multiline string val schema = JsonSchema.fromDefinition( """  {  "${key}schema": "http://json-schema.org/draft-07/schema#",  "definitions": {  "positiveInteger": {  "type": "integer",  "minimum": 0  }  },  "properties": {  "size": { "${key}ref": "#/definitions/positiveInteger" }  }  }  """.trimIndent(), ) val errors = mutableListOf<ValidationError>() val elementToValidate: JsonElement = loadJsonToValidate() val valid = schema.validate(elementToValidate, errors::add)

• Draft 7

  • Keywords

  Keyword	Status
  $id	Supported. $id in sub-schemas are collected as well and can be used in $ref
  $schema	Supported. Validates if schema is one of the supported schemas. The last supported is used if empty
  $ref	Supported (except references to schemas from another document)
  definitions	Supported. Definitions are loaded and can be referenced

  • Assertions

  Category	Assertion	Status
  General	type	Supported all type defined in the specification
  	enum	Supported
  	const	Supported
  Numbers	multipleOf	Supported
  	maximum	Supported
  	exclusiveMaximum	Supported
  	minimum	Supported
  	exclusiveMinimum	Supported
  Strings	maxLength	Supported
  	minLength	Supported
  	pattern	Supported (kotlin.text.Regex is used)
  Arrays	items	Supported
  	additionalItems	Supported
  	maxItems	Supported
  	uniqueItems	Supported
  	contains	Supported
  Objects	maxProperties	Supported
  	minProperties	Supported
  	required	Supported
  	properties	Supported
  	patternProperties	Supported (kotlin.text.Regex is used)
  	additionalProperties	Supported
  	dependencies	Supported
  	propertyNames	Supported
  Conditions	if/then/else	Supported
  Boolean logic	allOf	Supported
  	anyOf	Supported (all validation will be executed even if the element matches the first one)
  	oneOf	Supported
  	not	Supported

• Add $schema property validation (if not set the latest supported will be used)
• Add proper $id support (for nested schemas and for referencing)
• Add support for newer drafts
  • Draft 2019-09 (Draft 8)
  • 2020-12
• Formalize error output as it is defined in the latest drafts (have not fully decided if it should be done)