how to return a validation property on a hapi reply like the way Joi library does it - hapi.js

Question

I have my own custom validation on a property and I'd like to return a 400 response that is similar to the the JOI.validation that is returned on the other fields. This means that in addition to the error and message I'd like to return a validation property as well - so that the client can know which field to highlight.
So, instead of this
{
"statusCode": 400,
"error": "Bad Request",
"message": "phone validation error: invalid phone number"
}
I'd like to reply with this
{
"statusCode": 400,
"error": "Bad Request",
"message": "phone validation error: invalid phone number"
"validation": {
"source": "payload",
"keys": [
"phone"
]
}
How do I add the validation the the hapi reply?
I've been doing this - which has not been working
e.validation =
{
source: "payload",
keys: [
"phone"
]
}
reply(Boom.badRequest(e));
I'm also assuming that I cannot have custom validators for Joi, otherwise I would have just extended Joi. But, is there a Joi validation error type or object I can use in the reply to get Joi like object structure in my response.
BTW, my phone validation is not a simple regex and has special cases so I cannot use the Joi built in regex validator.

Answer 1

If you inspect the object returned by boom.badRequest('some message'), you'll get:
{ data: null,
isBoom: true,
isServer: false,
output:
{ statusCode: 400,
payload:
{ statusCode: 400,
error: 'Bad Request',
message: 'some message' },
headers: {} },
reformat: [Function] }
So you actually need to do something like
var errObj = Boom.badRequest(e);
errObj.output.payload.validation =
{
source: "payload",
keys: [
"phone"
]
}
reply(errObj);

Answer 2

Try this:
var errObj = Boom.badRequest(e);
errObj.validation =
{
source: "payload",
keys: [
"phone"
]
}
reply(errObj);