Joi validation of array - hapi.js

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
}))

Answer 2

If you want to validate an array of strings in Joi:
Joi.array().items(Joi.string().valid("item1", "item2", "item3", "item4"))

Answer 3

you can try this:
function(data) {
const Schema = {
categories: Joi.array().items(Joi.string()),
variables: Joi.array().items(Joi.object().keys().min(1))
}
return Joi.validate(data, Schema)
}
for more details checkout this repo: https://github.com/raysk4ever/nodejs_withMongoRefArray

Answer 4

You can also try this way, I have been using it for long time and working fine for me.
If your array is array of objects than use below:
const Joi = require('joi');
let schema = Joi.object().keys({
items: Joi.array().items(
Joi.object({
item_id: Joi.number().required(),
item_qty: Joi.number().required(),
item_type_id: Joi.number().required(),
item_qty: Joi.number().required(),
base_price: Joi.number().required(),
actual_price: Joi.number().required(),
})
).required(),
});
let errors = Joi.validate(req.body, schema);
if you array is simple array than:
let schema = Joi.object().keys({
items: Joi.array().items(
Joi.number().required()
).min(10).required()});

Answer 5

Joi.array().items(Joi.string().required(), Joi.number().required()); found it here

Answer 6

Validation when we have an array of objects using Joi:
const schema = Joi.array().items(
Joi.object().keys({
id: Joi.number().required(),
name: Joi.string().required(),
}));
We could add validations for objects inside an array itself.

Answer 7

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(Joi.string()),
variables : Joi.array().items(Joi.object().keys().max(1))
})
}).required()
})
}