jsonschema

I would like to know if I can define a JSON schema (draft 4) that requires at least one of many properties possible for an object. I already know of allOf , anyOf and oneOf but just can't figure out how to use them in the way I want. Here are some example JSON to illustrate : // Test Data 1 - Should pass { "email": "hello@example.com", "name": "John Doe" } // Test Data 2 - Should pass { "id": 1, "name": "Jane Doe" } // Test Data 3 - Should pass { "id": 1, "email": "hello@example.com", "name": "John Smith" } // Test Data 4 - Should fail, invalid email { "id": 1, "email": "thisIsNotAnEmail",

I am using the following schema to validate my json: { "$schema": "http://json-schema.org/schema#", "title": " Rules", "description": "Describes a set of rules", "type": "object", "properties": { "rules": { "type": "array", "items": { "type": "object", "properties": { "precedence": { "type": "number", "minimum": 0 }, "conditions": { "type": "array", "items": { "type": "object", "properties": { "field": { "type": "string", "enum": [ "Name", "Size" ] }, "relation": { "type": "string", "enum": [ "is", "is not", "is not one of", "is one of" ] }, "value": { "type": ["array", "string", "number"] } }

Suppose I have an object with four possible properties: a, b, c, d. a and b can only appear together (i.e., a appears if and only if b appears). If a and b appear, c cannot appear (that is, a/b and c are mutually exclusive). If a and b do not appear, c may appear (but is not required to). d can appear in any combination with a/b, c, or on its own. No properties other than a, b, c, or d may appear at all. How do I express this as a jsonschema? I suspect I could use some combination of oneOf and required , but I can't figure out the proper incantation. You can phrase your constraints as: either:

Given the following JSON schema, is it possible to indicate that the "name" property shall be unique (i.e. there should NOT be two items with the same "name" in the "elements" array. { "root": { "type": "object", "properties": { "elements": { "type": "array", "minItems": 1, "items": { "type": "object", "properties": { "name": { "type": "string", "title": "Element Name", "minLength": 3, }, "url": { "type": "string", "title": "Some URL" } } } } } } } I tried to use the uniqueItems keyword but it seems it was designed for simple lists of values. No, it is not possible. From the docs, json-schema:

Link to the specification: http://json-schema.org/latest/json-schema-validation.html#anchor64 Section 5.4.4.2 states: Successful validation of an object instance against these three keywords depends on the value of "additionalProperties": if its value is boolean true or a schema, validation succeeds; ... Section 5.4.4.3 states: If "additionalProperties" is absent, it may be considered present with an empty schema as a value. Ok, so if "additionalProperties" is absent, it counts as being present with an empty schema. And if it's a schema (of any kind), then the object validates successfully

The required field in JSON Schema JSON Schema features the properties , required and additionalProperties fields. For example, { "type": "object", "properties": { "elephant": {"type": "string"}, "giraffe": {"type": "string"}, "polarBear": {"type": "string"} }, "required": [ "elephant", "giraffe", "polarBear" ], "additionalProperties": false } Will validate JSON objects like: { "elephant": "Johnny", "giraffe": "Jimmy", "polarBear": "George" } But will fail if the list of properties is not exactly elephant, giraffe, polarBear . The problem I often copy-paste the list of properties to the list of