How to handle hapi validation errors?

Question

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

{
    "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" })
     }
  }
}

Ernest Jones · Accepted Answer · 2018-05-14 09:54:22Z

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...

answered May 14, 2018 at 9:54

Ernest Jones

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17 Comments

Ernest Jones Over a year ago

Glad I could help

Ernest Jones Over a year ago

Your right... And the documentation is not really clear on this point

Ashh Over a year ago

Hi ernest... I have a question... when I start my hapi server then doesn't show any logs... Do you have any idea about it? If you know the answer then I will raise a question for it

Ernest Jones Over a year ago

Yes I have the answer. Check the "creating a server" section here hapijs.com/tutorials. For hapi version below 17, you should put a console.log in the server.start callback

Ashh Over a year ago

Do you mean this options: { prettyPrint: false, logEvents: ['response'] }??

|

Sparw · Accepted Answer · 2018-05-14 06:20:30Z

1

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.

answered May 14, 2018 at 6:20

Sparw

2,7531 gold badge18 silver badges35 bronze badges

3 Comments

Ashh Over a year ago

Thank you Sparw... is there any better way to do it?

Sparw Over a year ago

I'm not sure there is a better way to do that properly.. :/

Ashh Over a year ago

your answer helps me to change the message and Ernest's answer helps me to return that messsage... So thanks it works...

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