Feasibility of adding custom types

[mycrl]

Adding custom validation now only implements format validation via addFormat, whether to consider adding custom types for more convenient type definitions.

Use a custom type ObjectId.

{ _id:  { type: "ObjectId" } }

validation.

this is mongodb Objectid.

{ _id: xxx._id  }

This way to implement any type I want through a custom type.

[epoberezkin]

Sorry, it has been previously been proposed and it won’t be supported. Type is a special keyword in JSON Schema and Ajv processes it differently from other keywords, so redefining it would be very complex. Also I do think it’s a bad idea to redefine standard keywords - it is better to define new custom keywords via available extension mechanism.