Validators

Overview of Validator Tools

Welcome to the 365education.org Validator Tools hub. This collection of online utilities is designed to help students, developers, and data administrators test, debug, and validate various types of code, data formats, and APIs efficiently. Use the cards above to quickly copy tool links, open upload/download workspaces, or launch the validators directly in a new tab.

CSS Validator

Ensure your Cascading Style Sheets adhere to W3C standards. The CSS Validator checks your stylesheets for syntax errors, compliance issues, and browser compatibility problems, helping you write clean and maintainable presentation layers for modern web pages.

JavaScript Validator

Catch syntax errors and logical flaws early in your frontend scripts. The JavaScript Validator parses your code using high-performance static analysis tools to verify structural correctness before deployment.

JSON Validator

Validate JavaScript Object Notation formats instantly. The JSON Validator checks your data payloads against standard specification rules, identifying missing brackets, quotes, or trailing commas to prevent parsing failures in web applications and APIs.

JSON5 Validator

Work with extended JSON configurations seamlessly. The JSON5 Validator supports modern syntax features such as comments, trailing commas, and unquoted keys, making it ideal for checking complex configuration files.

XML Validator

Verify the structure and syntax of Extensible Markup Language documents. The XML Validator ensures your tags are properly nested, closed, and formatted according to official document type definitions and standard schemas.

Credit Card Validator

Test payment processing logic safely. The Credit Card Validator uses standard algorithms (such as the Luhn algorithm) to check the structural validity, card brand identification, and number formatting for test payment tokens during development.

API Test

Streamline backend integration and endpoint testing. The API Test resource points to advanced testing environments where you can send HTTP requests, inspect response headers, and debug web service payloads.

YAML Validator

Ensure your human-readable data serialization files are syntax-error-free. The YAML Validator checks indentation, key-value mappings, and document structures, which is critical for configuration management and CI/CD pipelines.