Joi Nested schema

javascript node.js joi
Anshul picture Anshul · Apr 20, 2016 · Viewed 17.3k times · Source

I am trying to create nested schema in joi and it is throwing error

[Error: Object schema cannot be a joi schema]

var nestedSchema = joi.object({
    b: joi.number()
});

var base = joi.object({
    a: joi.string(),
    nestedData:joi.object(nestedSchema)
});

How should i define nested schema in joi?

Answer

Túbal Martín picture Túbal Martín · Mar 3, 2017

Although Francesco's answer works, there's no need to use object.keys(). The error the question creator was doing is to pass a schema as a parameter to joi.object().

So, creating nested schemas is as simple as assigning a schema to a key belonging to another schema.

const schemaA = Joi.string()
const schemaB = Joi.object({ keyB1: schemaA, keyB2: Joi.number() })
const schemaC = Joi.object({
  keyC1: Joi.string(),
  keyC2: schemaB  
})

Joi.validate({ keyC1: 'joi', keyC2: { keyB1: 'rocks!', keyB2: 3 } }, schemaC)

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