formsespresso

Formsespresso is an open-source library designed to simplify the creation, validation, and management of web forms in modern JavaScript applications. It provides a declarative API for defining form schemas and their fields, with a focus on accessibility, performance, and developer ergonomics. The library can be used with or without frontend frameworks and supports rendering forms in responsive layouts.

Its core concepts include form schemas, field types, and a validation system. Validators can be built-in, custom, synchronous or asynchronous, and can enforce cross-field rules. Formsespresso tracks validation state, error messages, touched and dirty fields, and offers real-time feedback. It also includes localization support and ARIA-compliant markup to improve accessibility across assistive technologies.

A typical workflow involves declaring a form schema, rendering the corresponding UI components, and subscribing to form state. On submission, the library runs validations, aggregates errors, and provides a clean payload for back-end processing. It supports data binding, form resets, and easy integration with existing state management or API clients.

Formsespresso is maintained as a community-driven project with documentation, examples, and a plugin ecosystem. It is distributed under an open-source license and hosted on a version-control platform with issue tracking and community contributions.