klander

A javascript validation library with a fluent interface and typed validation results.

Notice

This package is neither feature-extensive nor thoroughly tested. There are more mature options available. It has primarily been made for learning purposes and personal use. It is not recommended for professional usage.

Installation

npm install klander

Usage examples

Validating complex objects

import { array, boolean, nullable, number, object, oneOf, string } from "klander";

const employee = object({
  name: string(),
  id: number().int(),
  email: string().pattern(/^[email protected]$/),
  projects: array(object({ projectId: number(), role: string().enum("admin", "member") })),
});

const invalid_data = {
  name: "Max Mustermann",
  id: 2,
  email: "[email protected]",
  projects: [{ projectId: 25, role: null }],
};

const result = employee.validate(invalid_data);

/*
  {
    valid: false,
    errors: [
      K_ValidationError {
        location: 'projects.[0].role',
        message: 'Value must be a string'
      }
    ]
  }
*/