Strict Validator

A robust, configurable validation library for JavaScript developers who want strict data validation for user and tester inputs. Strict Validator enforces formatting rules and validates various input types to reduce errors and ensure consistent, high-quality data.

Installation

Install the package via npm:

npm install strict-validator

Usage

Import validateField from Strict Validator and specify the type of validation required for each input.

const { validateField } = require('strict-validator');

// Example usage
let numberResult = validateField("123456", 'number'); // Validates a numeric input
let lettersResult = validateField("John", 'letters'); // Validates letters-only input
let emailResult = validateField("[email protected]", 'email'); // Validates email format
let snakeCaseResult = validateField("hello_world", 'snake_case'); // Validates snake_case input

Validation Types

Supported Types

• number: Ensures input contains only numeric characters.
• letters: Allows only alphabetical characters (a-z, A-Z).
• alphanumeric: Permits letters, numbers, and spaces.
• text: Allows letters, numbers, spaces, and specific special characters.
• email: Validates a standard email format.
• text-underscore: Allows letters, numbers, spaces, underscores, and hyphens.
• snake_case: Enforces snake_case formatting.
• kebab-case: Enforces kebab-case formatting.
• camelCase: Validates camelCase input.

Example Validations

// Validate numeric input
let numberResult = validateField("123456", 'number'); // Returns '123456' if valid, false if invalid

// Validate letters-only input
let lettersResult = validateField("John", 'letters'); // Returns 'John' if valid, false if invalid

// Validate alphanumeric input
let textResult = validateField("John Doe", 'alphanumeric'); // Returns 'John Doe' if valid, false if invalid

// Validate email
let emailResult = validateField("[email protected]", 'email'); // Returns '[email protected]' if valid, false if invalid

// Validate snake_case
let snakeCaseResult = validateField("hello_world", 'snake_case'); // Returns 'hello_world' if valid, false if invalid

// Validate kebab-case
let kebabCaseResult = validateField("hello-world", 'kebab-case'); // Returns 'hello-world' if valid, false if invalid

// Validate camelCase
let camelCaseResult = validateField("helloWorld", 'camelCase'); // Returns 'helloWorld' if valid, false if invalid

Handling Validation Results

Each call to validateField returns either:

• The trimmed, validated input (if valid), or
• false if invalid, with an optional error message.

let result = validateField("[email protected]", 'email');
if (result) {
    console.log("Valid input:", result);
} else {
    console.log("Invalid input");
}

Error Messages

Errors for invalid inputs will display specific messages for:

• Empty or whitespace-only inputs
• Input starting with special characters
• Invalid characters based on the specified type
• Reserved words (e.g., name)

License

This package is open-source and available under the MIT License.