Email Validation API. Block Fake Users. Stop Disposable Emails from Creating Spam Accounts.

UserCheck identifies and blocks fake email addresses. So you can focus on real users.

Data validation using Python type hints.

Pydantic is the most widely used data validation library for Python.

Fast and extensible, Pydantic plays nicely with your linters/IDE/brain. Define how data should be in pure, canonical Python 3.9+; validate it with Pydantic.

• Pydantic @ GitHub.

Related contents:

• Loading Pydantic models from JSON without running out of memory @ Python=>Speed.
• Software Engineering for Data Scientists, Part 1: Pydantic Is All You Need for Poor Performance Spaghetti Code @ Han, Not Solo.

A declarative, 🐻‍❄️-native data frame validation library.

Dataframely is a Python package to validate the schema and content of polars data frames. Its purpose is to make data pipelines more robust by ensuring that data meet expectations and more readable by adding schema information to data frame type hints.

• Dataframely @ GitHub.

TypeScript's 1:1 validator, optimized from editor to runtime.

ArkType is a runtime validation library that parses optimized validators from familiar, type-safe syntax.

It can be used to check external data like JSON payloads or form submissions at the boundaries of your code (similar to Zod or Yup).

• ArkType @ GitHub.

Google's common Java, C++ and JavaScript library for parsing, formatting, and validating international phone numbers.

The Validation class is a PHP utility for performing data validation and error handling. It is designed to validate user-provided data against a set of rules and return error messages when validation fails.

• How to Simplify Data Validation in PHP With ValidationMyPhp @ HackerNoon.