Validate-contract NPM

validate-contract

JSON schema validator for the server and client sides.

1. INSTALLATION

Install the library with npm i validate-contract

2. TYPES OF USAGE

This library supports server and client side usage.

2.1. ECMAScript (ES) Module Usage

import { validate } from "validate-contract";

const register = {
  user_mail: "user@test",
  pwd: "12",
};

const contract = [
  { type: "length", name: "user_mail", options: [10, 50] },
  { type: "email", name: "user_mail" },
  { type: "password", name: "pwd", options: [3, 12] },
];

const result = validate(contract, register);
console.log(result);

console.log

[
  { message: 'Length should be min 10 and max 50', name: 'user_mail' },
  { message: 'Invalid email!', name: 'user_mail' },
  { message: 'Length should be min 3 and max 12', name: 'pwd' }
]

2.2. Server Side Usage

validate-contract is a set of express.js middlewares that wraps validator.js validator functions.

req.body
req.cookies
req.headers
req.params
req.query

import { middleware } from "validate-contract";
const { body, cookies, headers, params, query } = middleware;

Middleware Using Example

import express from "express";
import { middleware } from "validate-contract";

const app = express();
const { body } = middleware;

app.use(express.json());

const contract = [
  { type: "email", name: "email" },
  { type: "password", name: "password" },
];

app.use(body(contract));

app.use("/", (req, res, next) => {
  if (req.validationCheck) {
    console.log(req.validationResult);
    return res.status(400).json({ message: req.validationResult });
  }
  res.status(200).json("Ok!");
});

app.listen(3000, () => {
  console.log("Server is running!");
});

2.3. Browser Side Usage

You can also insert the CDN link in the field at the bottom for javascript.

<script src="https://unpkg.com/validate-contract@latest/validateContract.min.js"></script>

<!-- CDN -->
<script src="https://unpkg.com/validate-contract@latest/validateContract.min.js"></script>
<!-- Standalone Script -->
<script type="text/javascript" src="validateContract.min.js"></script>

<script type="text/javascript">
  const login = {
    email: "user@test",
    password: "12",
  };

  const contract = [
    { type: "email", name: "email" },
    { type: "password", name: "password" },
  ];

  const result = validateContract.validate(contract, login);
  console.log(result);
</script>

console.log

[
  { message: 'Invalid email!', name: 'email' },
  { message: 'Length should be min 4 and max 10', name: 'password' }
]

3. LIST OF THE VALIDATION TYPES

{
  type: "integer",               // mandatory field for validation type
  name: "day",                   // mandatory field for validation parameter
  options: [1, 31],              // optional field for additional validation features
  message: "Invalid Day Length!" // optional field for custom message
}

Types of Validation	Description
`integer`	Used for integer type and lengthThe first argument of the options is for `min` and the second argument is for `max`.Default options, `options: [0, 500]`
`length`	Used for text lengthThe first argument of the options is for `min` and the second argument is for `max`.Default options, `options: [0, 500]`
`email`	Used for valid email type
`password`	Used for complex password type and lengththe arguments are as follows => `[minLength, maxLength, minLowerCase, minUpperCase, minNumber]`.Default options, `options: [4, 10, 0, 0, 1]`
`phone`	Used for phone number type
`match`	Checks whether it has the same value as another parameter in the same payload.
`optional`	Checks whether it can take an empty value.