DIGIT Form Engine

A dynamic form rendering engine for Flutter that builds multi-page, configurable forms from JSON schema. It handles field rendering, validation, summary generation — all driven by configuration.

Overview

A dynamic form rendering engine for Flutter, built on top of the digit_ui_components package. It allows you to define flexible, multi-page forms using a JSON schema. The engine renders fields and pages based on configuration, with automatic validation, navigation, and summary generation.

Link to the Pub Package:

digit_forms_engine | Flutter packageDart packages

Features

• Render multi-page forms from JSON schema fetched via MDMS

• Support for 14+ field types — text, dropdown, radio, checkbox, date, DOB, numeric, GPS coordinates, QR/barcode scanner, locality search, and more

• Built-in validation — required, min/max length, min/max value, regex pattern, cross-field comparison

• Conditional field visibility — show or hide fields based on formula expressions at runtime

• Auto-fill fields based on conditions (e.g., auto-calculate age from date of birth)

• Conditional navigation — route to different pages based on field values

• Multi-entity tab view — capture same fields for multiple selected entities (e.g., multiple products)

• Summary page generation with edit support

• Custom widget integration — plug in your own widgets using BaseReactiveFieldWrapper

• QR code and GS1 barcode scanning with validation

• Screenshot protection on sensitive pages

• Multi-language localization support

Supported Field Types:

Format	Description
text	Plain text input
textArea	Multi-line text input
numeric	Number input with min/max constraints
dropdown	Single or multi-select dropdown
radio	Radio button group
checkbox	Boolean checkbox
date	Date picker with range support
dob	Date of birth picker with age calculation
mobileNumber	Phone number with format validation
latLng	GPS coordinates (latitude, longitude, accuracy)
locality	boundary
scanner	QR code and GS1 barcode scanner
idPopulator	Auto-generated ID field
custom	Plug in any custom widget

Supported Validations:

Type	Description
required	Field must not be empty
minLength / maxLength	String length constraints
min / max	Numeric value constraints
pattern	Regex pattern matching
notEqualTo	Must not equal another field's value
scanLimit	Max number of scans allowed
isGS1	Validate GS1 barcode format

Sequence Diagram

Installation

Add this to your package's pubspec.yaml file:

dependencies:
  digit_forms_engine: ^1.0.0

Then run:

flutter pub get