OtterValidation

Simple, lightweight validation with full typescript support

Installation

npm install ottervalidation

Full example

import { OV, OVValidation } from 'ottervalidation';

interface Form {
  username: string,
  password: string,
  mailAddress: string,
}

const form: Form = {
  username: 'Some username',
  password: 'SomeP4ssword!',
  mailAddress: '[email protected]',
};

const validation: OVValidation<Form> = {
  username: {
    required: true,
    type: 'string',
    minLength: 4,
    maxLength: 32,
  },
  password: {
    required: true,
    type: 'string',
    minLength: 8,
    maxLength: 128,
    minUpperCase: 1,
    minLowerCase: 1,
    minNumeric: 1,
    minSymbol: 1,
  },
  mailAddress: {
    required: true,
    type: 'string',
    email: true,
  },
};

const ov = new OV(form, validation);
const ovResult = ov.validate();
/*
  ovResult: {
    object: {
      username: {},
      password: {},
      mailAddress: {},
    }
  }
*/

Example with errors

import { OV, OVValidation } from 'ottervalidation';

interface Form {
  username: string,
  password: string,
  mailAddress: string,
}

const form = {
  password: 'invalid length',
  mailAddress: 'invalid email',
} as Form;

const validation: OVValidation<Form> = {
  username: {
    required: true,
  },
  password: {
    minLength: 32,
  },
  mailAddress: {
    email: true,
  },
};

const ov = new OV(form, validation);
const ovResult = ov.validate();
/*
  ovResult: {
    errors: ['username.required', 'password.minlength', 'mailAddress.email'],
    object: {
      username: { errors: ['username.required'] },
      password: { errors: ['password.minlength'] },
      mailAddress: { errors: ['mailAddress.email'] },
    }
  }
*/

Validation types

Key	Argument	Description	Works with
required	boolean	checks whether the key exists in the object	string, number, boolean
type	string / string[]	Checks whether the value is of the given type	string, number, boolean
minLength	number	Checks whether the value has the minimum length	string
maxLength	number	Checks whether the value has the maximum length	string
exactLength	number	Checks whether the value has the exact length	string
email	boolean	Checks whether the value is an e-mail address	string
minUpperCase	number	Checks whether the value has the minimum number of uppercase letters	string
minLowerCase	number	Checks whether the value has the minimum number of lowercase letters	string
minNumeric	number	Checks whether the value has the minimum number of numerics	string
minSymbol	number	Checks whether the value has the minimum number of symbol characters	string
regex	RegExp	Checks whether the value matches against the regex	string

Configuration Example

...

const config: OVConfiguration = {
  errorMessage: {
    prefix: 'validation',
    addKeyPrefix: true,
    override: {
      'validation.username.required': 'Username is required',
    }
  }
}

const ov = new OV(form, validation, config);
const ovResult = ov.validate();
/*
  ovResult: {
    errors: ['Username is required'],
    object: {
      username: { errors: ['Username is required'] },
    }
  }
*/

Configuration

Key	Argument	Description
errorMessage.prefix	string	Adds a prefix to the error message
errorMessage.addKeyPrefix	boolean	Add the key prefix to error message (default true)
errorMessage.override	Record<string, string>	Overrides the error message

Contributing

# install dependencies
npm install

# run all tests
npm test

# run linter
npm run lint

License

MIT