React JSON Schema Form

RJSF (React JSON Schema Form) is a popular open-source library for building forms in React from JSON Schema definitions, enabling data-driven form generation with minimal boilerplate. Originally created by Nic Jansma at Mozilla in 2015 and maintained by the RJSF community, the project has over 14,000 stars as of 2026. Key features include: JSON Schema-based (generating form fields, validation rules, and default values from JSON Schema definitions, supporting object, array, string, number, integer, boolean, null, and custom types), JSON Schema validation (draft-07, draft-06, and draft-04 support with ajv validator for schema compliance, required fields, min/max, pattern, enum, format, and custom validation keywords), UI Schema (separating presentation from data schema via ui:uiSchema for controlling widget selection, field ordering, CSS classes, help text, placeholders, autofocus, and conditional visibility), custom widgets and fields (extending built-in text, textarea, select, checkbox, radio, color, date, email, password, and file widgets with custom React components), theme support (pluggable theme system with themes for Bootstrap 3, Bootstrap 4, Material UI, Chakra UI, Fluent UI, Semantic UI, MUI, and Ant Design), array fields (array item management with add, remove, reorder, copy, and collapse operations), conditional fields (showing and hiding fields based on other field values via allOf, anyOf, oneOf, and if-then-else constructs), form lifecycle (onChange, onSubmit, onError, and onFocus handlers for full form lifecycle control), error handling (JSON Schema validation errors and custom validation with live, onBlur, and onSubmit validation modes), file upload (file widget with configurable accept types and custom upload handlers), and multi-step forms (supporting multi-page form workflows with conditional navigation).