CODEWITHSUNDEEP
javascriptvalidationjoi
Batters
Batters

Reputation: 749

Joi require unkown fields

I am validating a GET request query string (using express-joi-validation) and require the user to pass at least one extra key value pair not directly specified in the schema.

I have tried to validate as follows:

const schema = Joi
    .object({
        requiredKey: Joi.string().required()
        knownExtraKey: Joi.boolean()
    })
    .pattern(/^/, Joi.string().required())

schema.validate({requiredKey: 'A'}) // valid but shouldn't be
schema.validate({requiredKey: 'A', name: "paul"}) // valid

Upvotes: 0

Views: 375

Answers (1)

a1300
a1300

Reputation: 2813

If you want at least one property:

joi version 17.2.1

Explanation:

You need to specify the minimum keys object().min() with the following formular: number of required properties + 1. In the example below the validation returns no error if you validate an object with 3 or 4 properties.

const Joi = require('joi');

const schema = Joi.object().keys({
  one: Joi.string().required(),
  two: Joi.string().required(),
  three: Joi.string(),
  four: Joi.string(),
}).min(3);

// works
const data1 = {
  one: 'one',
  two: 'two',
  three: 'three',
};
console.log(schema.validate(data1).error);

// works
const data2 = {
  one: 'one',
  two: 'two',
  three: 'three',
  four: 'four',
};
console.log(schema.validate(data2).error);

// fails
const data3 = {
  one: 'one',
  two: 'two',
};
console.log(schema.validate(data3).error)

Upvotes: 1

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