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A Modern, Scalable , Graceful, Easy Use data structure validator, Support browser and NodeJs

  • [x] All in Javascript. No Magic string.
  • [x] Strict mode, no one excess field.
  • [x] Most of type validator support.
  • [x] Scalable, easy to define your customize validator.
  • [x] Highly customizable.
  • [x] Validate with params, Support pass the argument to the validator.
  • [x] Pipe line, multiple validator work together.
  • [x] Support endless nest object, including Object and Array.
  • [x] Clear error message.
  • [x] Support nest Struct

Quick start

npm install @axetroy/struct --save
const { Struct, type } = require('@axetroy/struct');

const data = {
  name: 'axetroy',
  age: 18,
  address: {
    city: 'DC',
    code: '12' // invalid city code, it should be an integer

const User = Struct({
  name: type.string,
  address: {
    city: type.string,

const err = User.validate(data);

console.log(err); // if all validator success, the error should be undefined

{ Error
    at Object.<anonymous> (/home/axetroy/gpm/
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/home/axetroy/gpm/
    at Module._compile (module.js:635:30)
  validator: 'int',
  path: [ 'address', 'code' ],
  value: '12',
  detail: 'Expected a value of type `int` for `address.code` but received `12`.',
  message: 'Expected a value of type `int` for `address.code` but received `12`.' }

Advanced usage

const { Struct, type } = require('@axetroy/struct');

const data = {
  name: 'axetroy',
  age: 18,
  address: {
    city: 'DC',
    code: 100
  message: [
    { from: 'marry', msg: 'How are you?', timestamp: 1513155028 },
    { from: 'henry', msg: "How's going one?", timestamp: 1513135028 }

const User = new Struct({
  name: type.string,
  age:, // age is int && and age >= 18
  address: {
    city: type.string,
  message: [
      from: type.string,
      msg: type.string,

const err = User.validate(data);

console.log(err); // undefined, because the data pass the validator


class: Struct

Create a struct

const { Struct, type } = require('@axetroy/struct');

const struct1 = new Struct(type.string);
const struct2 = Struct(type.string);

static Struct.define

static Struct.Type


const err = Struct.validate({ word: 'Hello world' });

validate the data is match with struct, if all match. return undefined, if not, return an TypeError

class: Type

Create a type

static: Type.define(validatorName, handler)

  • validatorName:
  • handler: <(input):bool | (argv):(input):bool>
Type.define('email', function(input) {
  // here to check is it a email string
  return true;

define a customize type, will add an property on type.prototype

const stringType = type.string;
const intType =;
const composingType =;
Validator Description Require Argument Source Code
number Check the type is a number false src/validator/number
int Check the type is a int false src/validator/int
float Check the type is a float false src/validator/float
string Check the type is a string false src/validator/string
bool Check the type is a bool false src/validator/bool
any Any type false src/validator/any
odd Check the type is a number and odd false src/validator/odd
even Check the type is a number and even false src/validator/even
json Check the type is json string false src/validator/json
eq(value) Equal to some value true src/validator/eq
gt(number) Greater then a number true src/validator/gt
gte(number) Greater then or equal a number true src/validator/gte
lt(number) Less then a number true src/validator/lt
lte(number) Less then or equal a number true src/validator/lte
bt(min, max) Between the min and max true src/validator/bt
in(array) The value is in the array true src/validator/in
len(int) The values's length property equal to xxx true src/validator/len
msg(message) Custom error message of this field true src/validator/msg
func(validatorFunc) Custom Validator true src/validator/func

All the validator is define on type.prototype.

class: TypeError

  • validator: What validator fail
  • path: What key not pass the validator
  • value: The value which not pass the validator
  • message: The error message
  • detail: The error message

The TypeError inherit from Error


There is the examples, may be it can help you


Contributing Guid



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