itsa - v2

Pronounced "it's a". As in... it's a number.

itsa is a JavaScript data validation library. This is version 2 which has been completely re-written and is basically an all new library.

Features

• Client side & server side
• JavaScript or TypeScript
• 100% Test Coverage (Mocha)
• Composable
• Extensible
• No dependencies
• 6.7 KB Minified & Gzipped
• Convert/default data in-place
• Bail on first error or get all errors
• Get paths & messages for each error
• Serialize/deserialize to/from json
• Partial verification (for updates)
• Touch support (for Vue.js)

Simple Example

const { itsa } = require("itsa");

itsa.number().validate('foo').ok === false;

Complex Example

const { itsa } = require("itsa");

const schema = itsa.object({
  name: itsa.string(),
  email: itsa.email(),
  age: itsa.any(
    itsa.number().between(18, 200),
    null,
    undefined,
  ),
  colors: itsa.array(
    itsa.any("red", "green", "blue"),
  ).notEmpty(),
});

const result = schema.validate({ name: "Bob", email: "bob@example.com" });
result.ok === false;
result.message === "colors: must be an array";

Installation

With NPM

> npm install itsa

const { itsa } = require('itsa');

Without NPM

If you don't use NPM, then use dist/itsa.js for development (it has source maps) and use dist/itsa.min.js for production. There are no dependencies.

> itsa.min.js - 14K minified, 4K gzipped

---

Required vs Optional

If you want to make a property optional, then you should use the itsa.any to list all of the values that are valid. Here's a simple example that shows the difference:

itsa.string().validate(null).ok === false;
itsa.any(itsa.string(), null).validate(null).ok === true;

Validating

validate(value) -> result

Once you've built up your fancy validator, just call validate with your value.

It will return a result object that has ok set to true or false. message gives a description of the error. errors gives a full list of error objects. value gives the updated value (only different if you use a converter on the root object).

 const validator = itsa.string().maxLength(5);
 const result = validator.validate("Bob was here");
 result.ok === false;
 result.message ~== "Length is 12, max is 5";

validOrThrow(value)

As a shorthand, you can choose to automatically throw if the data is invalid:

var doThing = function (criteria, callback) {
  //validate
  itsa.object({
    criteria: itsa.object(),
    callback: itsa.function()
  }).validOrThrow({
    criteria: criteria,
    callback: callback
  });

  //all good
};

Available Methods

Todo: for now, check out files and tests in /src for a full listing.

Alternative Libraries

JavaScript Data Validators:

• molnarg/js-schema - "Simple and intuitive schema validator"
• ansman/validate.js - "Declarative validation written in javascript"
• eivindfjeldstad/validate - "Validate nested object properties in javascript"
• chriso/validator.js - "String validation and sanitization"
• ron-liu/validate-obj.js - "simple way to validate object in javasciprt"

HTML Form Validators

• thedersen/backbone.validation - "A validation plugin for Backbone.js that validates both your model as well as form input"
• rickharrison/validate.js - "Lightweight JavaScript form validation library inspired by CodeIgniter."
• DiegoLopesLima/Validate/validate.js - "The jQuery Validate is an advanced plugin for an easily and quickly form validation"
• guillaumepotier/Parsley.js - "Validate your forms, frontend, without writing a single line of javascript - http://parsleyjs.org"
• formvalidation/formvalidation - "The best @jquery plugin to validate form fields."

License

MIT