JSON schema cheatsheet / quick reference

Datatypes

• "string": "Hello World"
• "number": 1.23
• "integer": 123 1.2e10
• "boolean": true
• "object": {"foo":"bar", "baz":"Hello World"}
• "array": ["foo","bar", 5,"hello"]
• "null": null

Generic Keywords

• id
• description
• default
• patternProperties
• dependencies
• extends
• $ref
• $schema
• allOf, anyOf, oneOf

Features

string + number + integer

• enum: [...]
• format: date-time, email, hostname, ipv4, ipv6, uri

string

• minLength, maxLength
• pattern: regexp

number + integer

• minimum, maximum
• exclusiveMinimum, exclusiveMaximum
• multipleOf

array

• items
• minItems, maxItems
• uniqueItems: enforce uniqueness
• additionalItems: if true, validation always passes

object

• properties
• minProperties, maxProperties
• patternProperties: regex base properties
• additionalProperties: if true, validation always passes
• required

JSON Schema Faker

• faker