Troi

Troi is a middleware-based data validation and sanitization library.

Installation

npm install troi

Example

const troi = require('troi/chain');

const schema = troi.object({
  username: troi.filled()
    .string()
    .trim()
    .lengthBetween(2, 10),
  email: troi.filled()
    .lowercase()
    .email(),
  password: troi.filled()
    .string()
    .lengthBetween(3, 30)
    .pattern(/^[a-zA-Z0-9]+$/)
});

schema.validate({
  username: 'karate-kid',
  email: '[email protected]',
  password: 'n0C0br4k4i'
});
// -> { username: 'karate-kid', email: '[email protected]', password: 'N0C0br4k4i' }

schema.validate({
  username: 'karate-kid'
});
// Throws validation error

API

Work in progress

filled()

required()

optional()

nullable()

string()

number()

integer()

boolean()

date()

array(itemValidator?: function)

object(properties?: object)

params(schema: object)

oneOf(values: Array<any>)

unique()

between(min: number, max: number)

min(min: number)

max(max: number)

lengthBetween(min: number, max: number)

minLength(min: number)

maxLength(min: number)

pattern(regexp: RegExp, type?: string)

email()

lowercase()

uppercase()

Chain API

Work in progress

Concepts and Terminology

Middleware Function

Middleware functions can perform the following tasks:

• return validation errors and stop further execution
• transform values (examples: trim, nullify)
• intercept execution (examples: optional, nullable)

Transform function

A middleware function that may transform its input argument and return another value.

const trim = (input, next) => next(typeof input === 'string' ? input.trim() : input);

Interceptor function

A middleware function that may stop the execution of remaining middleware functions.

const optional = (input, next) => input === undefined ? input : next(input)

Identity Function

A function that always returns the same value that was used as its argument.

identity('string') // returns 'string'

Todos

• [ ] Allow middleware to pass ValidationError to next() and stop execution
• [ ] Make chain builder immutable
• [ ] Add coerce transform function
• [ ] Rename all value arguments to input for consistency
• [ ] Use rollup.js