How to handle hapi validation errors?

I have following route code for hapi...

const routeConfig = {
method: 'POST',
path: '/user',
config: {
validate: {
payload: {
firstName: Joi.string().required(),
}
},
handler
}
}


So when I don't pass the firstName it throws error like this

firstName

{
"statusCode": 400,
"error": "Bad Request",
"message": "child "firstName" fails because ["firstName" is required]",
"validation": {
"source": "payload",
"keys": [
"firstName"
]
}
}


Now, I need to handle the above error in catch

const handler = async(request, reply) => {
try {
const payload = request.payload
const createUser = await User.create(payload)
let token = Helpers.createJwt(createUser)
reply({ success: true, message: 'User created successFully', token })
} catch(err) {
// need to do something here to handle the error like
if (err) {
reply ({ error: "firstName is required", message: "Signup unsuccessfull" })
}
}
}


2 Answers
2

There is a much better solution:

config: {
validate: {
payload: {
firstName: Joi.string().required(),
},
failAction(request, reply, source, error) {
reply({
error: 'badRequest',
}).code(400);
},
},
},


If the Joi validation fails, it will trigger the failAction and you will be able to handle the error (sending it to log service and/or return a specific message).

It's a bit hidden in the doc but here is the relevant part

I must confess, I did'nt tried it with hapi 17...

That's what I wanted to do... Perfect man
– Anthony Winzlet
May 14 at 16:21

Glad I could help
– Ernest Jones
May 14 at 16:23

Your right... And the documentation is not really clear on this point
– Ernest Jones
May 14 at 16:25

Thank you Ernest
– Anthony Winzlet
May 14 at 16:26

Your welcome Ashish ^^
– Ernest Jones
May 14 at 16:27

Maybe you should try with something like this ?

const routeConfig = {
method: 'POST',
path: '/user',
config: {
validate: {
payload: {
firstName: Joi.string().required().error(new Error('firstName is required')),
}
},
handler
}
}


Take a look on this page here

Hope it helps.

Thank you Sparw... is there any better way to do it?
– Anthony Winzlet
May 14 at 6:34

I'm not sure there is a better way to do that properly.. :/
– Sparw
May 14 at 7:37

your answer helps me to change the message and Ernest's answer helps me to return that messsage... So thanks it works...
– Anthony Winzlet
May 19 at 6:45

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