ForgJs is a JavaScript lightweight object validator. Go check the Quick start section and start coding with love ❤️

Quick start

Install it via npm by running npm i @cesium133/forgjs

Your first validator:

  const { Validator, Rule } = require('@cesium133/forgjs');
  
  const vComplexe = new Validator({
    age: new Rule({ type: 'int', min: 18, max: 99 }),
    dateOfBirth: new Rule({ type: 'date' }),
    array: new Rule({ type: 'array', of: new Rule({ type: 'string' }) }),
  });

  vComplexe.test({
    age: 26,
    dateOfBirth: new Date(1995, 10, 3),
    array: ['1'],
  }); /// returns true

Error handling

You can get custom error messages by doing this:

const vComplexe = new Validator({
    age: new Rule({
      type: 'int', min: 18, max: 99,
    }, 'age must be integer and between 18 and 99'),
    dateOfBirth: new Rule({ type: 'date' }, 'date must be a date'),
  });

  vComplexe.getErrors({
    age: 16,
    dateOfBirth: 123,
  }); // ['age must be integer and between 18 and 99', 'date must be a date']

Rules

A Rule object validates a single value, it can be used like this:

  const { Validator, Rule } = require('@cesium133/forgjs');
  const floatRule = new Rule({
    type: 'float',
    min: 100,
  }, null);

  floatRule.test(2.001); /// returns true;

The only required value is type!

You can make a rule by simply passing a string if you only need to check the type : new Rule("int");

int type

min (int)
max (int)
equal (int)

string type

minLength (int)
maxLength (int)
equal (int)
match: (regex)
notEmpty (bool)

date type

after (date)
before (date)
between (Array of dates like this [date, date])
equal (date)

float type

min (Number)
max (Number)
equal (float)

array type

of (Rule or Validator object)
notEmpty (bool)
length (int)

The of rule checks every element of the array against the rule.

function type

result

To explain result, what's better than an example:

  const { Validator, Rule } = require('@cesium133/forgjs');

  function someFunctionThatReturnsAnInt(int) {
    return int * 5;
  }

  const functionTest = new Rule({
    type: 'function',
    result: {
      of: 5,
      toBe: new Rule('int'),
    },
  }, null);

  functionTest.test(someFunctionThatReturnsAnInt); /// returns true;

Multiple types:

You can check for multiple types with OR or AND operators like this:

  const intRule = new Rule({
    type: 'int|float|number',
  }, null);

  intRule.test(2) // returns true

This means the test should verify the int, float or number rule

  const intRule = new Rule({
    type: 'int&number',
  }, null);
  intRule.test(2.1); // returns false

The result doesn't match the int rule

Common properties:

Every type has these properties:

optional
custom

optional

If optional is set to true the element is optional and an undefined value is considered correct. Example:

const { Validator, Rule } = require('@cesium133/forgjs');

const intRule = new Rule({
    type: 'int',
    optional: true,
  }, null);
intRule.test(); // returns true

custom

Custom allows you to write your own rule, an example is better than a long explanation:

  const { Validator, Rule } = require('@cesium133/forgjs');
  
  function isCorrectAge(age, object) {
    if (age === Math.floor((new Date() - object.dateOfBirth) / 1000 / 60 / 60 / 24 / 30 / 12)) {
      return true;
    }
    return false;
  }
  const vComplexe = new Validator({
    age: new Rule({
      type: 'int', min: 18, max: 99, custom: isCorrectAge,
    }),
    dateOfBirth: new Rule({ type: 'date' }),
  });

  vComplexe.test({
    age: 23,
    dateOfBirth: new Date(1995, 10, 3),
    array: ['1'],
  }); // returns true

Make a new type:

Creating a new type is done using the Rule class like this:

  const { Validator, Rule } = require('@cesium133/forgjs'); 
  
  Rule.addCustom('customInteger', {
    min: (val, min) => val - min > 0,
    max: (val, max) => val - max < 0,
    equal: (val, equal) => val === equal,
    type: val => Number.isInteger(val) && val > 0 && val < 100,
  });

  const customInteger = new Rule({
    type: 'customInteger',
    min: 10,
  }, null);

  customInteger.test(11) // returns true

  customInteger.test(200) // returns false

Left TO DO for next release

Contact

Follow me on twitter at @forg_js

shaunstanislauslau / forgjs Goto Github PK

forgjs's Introduction