DavyJonesLocker/client_side_validations

Health v2 · maintenance only

Adoption not part of the score

2680 stars · 395 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A Ruby gem and JavaScript package that automatically extracts ActiveModel validation rules from a Rails backend and applies them as client-side form validations. It renders validation errors identically to server-side rendering and supports custom validators, nested fields, and a plugin system for additional form builders and ORMs.

Use cases

• validate rails forms in the browser without page reloads
• reuse server-side activemodel validation rules on the client
• show inline form validation errors matching server-side rendering
• validate nested form fields client-side
• add client-side validation to a custom rails form builder
• avoid duplicating validation logic between backend and frontend

When to choose

• you have a Rails 7.2 or 8.x app with ActiveModel::Validations and want instant client-side feedback
• you want client-side errors to look identical to server-side validation errors
• you need support for nested fields and custom validations out of the box
• you want a jQuery-free, plugin-extensible validation solution

When to avoid

• you are not using Ruby on Rails or ActiveModel-based models
• your validations rely heavily on conditional callbacks like :if/:unless, which fall back to the server
• you use a frontend framework (React, Vue) with its own form validation ecosystem
• you need validations for non-Rails backends

Facets

library · maturity active

form-handling frontend-framework plugin-system web-development frontend developer-tools ruby browser ruby-on-rails client-side-validation activemodel form-validation gem javascript web-server

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