Joi validation of array

Question

trying to validate that an array has zero or more strings in one case and that it has zero or more objects in another , struggling with Joi docs :(

validate: {         headers: Joi.object({                 'content-type': "application/vnd.api+json",                 accept: "application/vnd.api+json"         }).options({ allowUnknown: true }),         payload : Joi.object().keys({             data : Joi.object().keys({                 type: Joi.any().allow('BY_TEMPLATE').required(),                 attributes: Joi.object({                     to : Joi.string().email().required(),                     templateId : Joi.string().required(),                     categories : Joi.array().items( //trying to validate here that each element is a string),                     variables : Joi.array({                         //also trying to validate here that each element is an Object with one key and value                     })                 })             }).required()         })     } 

Answer 1

Joi.array().items() accepts another Joi schema to use against the array elements. So an array of strings is this easy:

Joi.array().items(Joi.string()) 

Same for an array of objects; just pass an object schema to items():

Joi.array().items(Joi.object({     // Object schema }))