How to integrate FieldVal-JS with a React form?

You can import FieldVal-JS and set up validation logic in React components, but it requires manual state management for errors and inputs since it lacks built-in hooks or components. Consider using it with React's useState or context for integration.

FieldVal-JS vs Yup: which is better for form validation?

FieldVal-JS excels with dual sync/async validation and structured errors, while Yup is schema-based and often paired with Formik for React. Choose FieldVal-JS for flexibility across environments, but Yup for stronger React ecosystem ties.

How to create a custom async validation rule in FieldVal-JS?

Define a function that returns a promise, such as checking database uniqueness, and integrate it using FieldVal-JS's extensible architecture. The library handles promise resolution and error reporting seamlessly.

Does FieldVal-JS work with Node.js for API validation?

Yes, FieldVal-JS is JavaScript-native and suitable for Node.js environments, allowing validation of incoming API data with its synchronous and asynchronous methods for robust server-side checks.

Can FieldVal-JS validate nested objects and arrays?

Yes, its multipurpose design supports complex data structures, enabling validation of nested objects and arrays through custom rules and hierarchical error reporting as per its documentation examples.

Is FieldVal-JS good for real-time form validation?

Yes, with asynchronous validation support, it can handle real-time checks like email availability via promises, making it suitable for dynamic form inputs that require server-side verification.

Open-Awesome

FieldVal

Apache-2.0JavaScript

A multipurpose JavaScript validation library supporting both synchronous and asynchronous validation with structured error reporting.

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136 stars9 forks0 contributors

What is FieldVal?

FieldVal-JS is a multipurpose JavaScript validation library that enables developers to validate data with both synchronous and asynchronous methods. It solves the problem of implementing consistent validation logic across different parts of an application while providing structured error reports for better debugging.

Target Audience

JavaScript developers building applications that require robust data validation, including form validation, API input validation, and data integrity checks.

Value Proposition

Developers choose FieldVal-JS for its dual support of synchronous and asynchronous validation, its clear error reporting structure, and its flexibility to handle various validation scenarios without being tied to specific frameworks.

Overview

FieldVal-JS is a flexible validation library for JavaScript that enables developers to validate data with clear, structured error reporting. It handles both synchronous and asynchronous validation scenarios, making it suitable for various application contexts.

Key Features

Synchronous and Asynchronous Validation — Supports both immediate and promise-based validation workflows
Structured Error Reports — Provides readable, organized error messages for easier debugging
Multipurpose Design — Can be used for form validation, API data validation, and general data integrity checks
Extensible Architecture — Allows custom validation rules and integration with existing codebases

Philosophy

FieldVal-JS emphasizes simplicity and clarity in validation, focusing on providing developers with tools to create robust validation logic without unnecessary complexity.

Use Cases

Best For

Validating complex form data with custom validation rules
Implementing asynchronous validation for API endpoints
Creating reusable validation logic across frontend and backend
Generating structured error reports for user input validation
Building validation systems that require both immediate and deferred validation
Adding validation to JavaScript applications without framework dependencies

Not Ideal For

Projects heavily reliant on React or Vue with form libraries like Formik or VeeValidate that offer tighter framework integration
Applications requiring validation with automatic UI feedback and pre-styled error components out of the box
Environments where minimal bundle size is critical, preferring lighter alternatives like validator.js
Teams needing extensive community support and third-party plugins for validation

Pros & Cons

Pros

Dual Validation Modes

Supports both synchronous and asynchronous validation, enabling immediate checks and promise-based workflows for scenarios like API verification, as stated in its key features.

Structured Error Reporting

Provides readable, organized error messages that simplify debugging and user feedback, a core focus emphasized in the README for clarity.

Framework Agnostic

Can be used in any JavaScript environment without dependencies on specific frameworks, offering flexibility for frontend, backend, or general data validation.

Extensible Architecture

Allows custom validation rules and integration with existing codebases, making it adaptable to diverse validation needs as highlighted in the features.

Cons

External Documentation

Documentation is hosted on a separate site (fieldval.com), which may be less accessible, up-to-date, or integrated compared to inline README examples or popular libraries.

Limited Ecosystem

Has a smaller community and fewer third-party integrations than established alternatives like Joi or Yup, potentially complicating adoption and support.

No Built-in UI

Focuses solely on validation logic without providing UI components for error display, requiring additional frontend work for seamless user experience integration.

Frequently Asked Questions

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