corextra

Handy Dart extensions and utility functions for String, int, double, List, and more — plus form validators, responsive helpers, logging, and an in-app DevTools panel.

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Features

Core Extensions

• Null-safe checks like .isNullOrEmpty on String? and List?
• Safe conversions: .toTryInt(), .toTryDouble(), .toTryBool()
• String helpers: .capitalize(), .toPascalCase(), .toCamelCase()
• DateTime parsing and formatting
• safeSetState: calls setState() only if the widget is still mounted

Form Validators

• required, email, phone, otp, password, confirmPassword
• minLength, maxLength, numeric, url, pattern
• FormValidators.compose([...]) — chain validators, returns the first error
• FormValidators.optional(validator) — skip validation on empty, non-required fields
• Every validator takes an optional message: override
• Optional translation support via easy_localization

Responsive Utilities

• ResponsiveBreakpoints: sm / md / lg / xl / xxl helpers on BuildContext or BoxConstraints
• deviceType, isMobile, isTablet, isDesktop — coarse device classification
• responsive<T>(base: ..., md: ..., lg: ...) — pick a value per breakpoint, no LayoutBuilder needed
• screenWidth, screenHeight, isPortrait, isLandscape on BuildContext

Error Handling

• CorextraException, CorextraCustomException, CorextraNetworkException
• DioErrorHandler maps Dio errors to user-friendly, typed exceptions

Logging

• debugLog — lightweight, debug-only logger with LogLevel (info / warning / error)
• AppLogger — structured logging for app events and Dio requests/responses/errors
• AppLoggerInterceptor — pretty, color-coded Dio logs, one block per event (toggle with enabled: false)

Animation

• FadeSlideTransition — combined fade + slide transition, with top / bottom / left / right / custom directions

DevTools Panel

An in-app inspector styled after Flutter DevTools. No separate DevTools connection needed, and it's automatically disabled outside debug builds.

MaterialApp(
  builder: (context, child) =>
      CorextraDevToolsOverlay(child: child ?? const SizedBox.shrink()),
  home: const HomeScreen(),
)

dio.interceptors.add(const CorextraDevToolsInterceptor());

A draggable bubble opens the panel:

• Network — every request/response, searchable and filterable by method or status. Headers, query params, and body each get their own tab. Sensitive headers (Authorization, Cookie, etc.) get a TOKEN badge — mask the value with hiddenHeaders while keeping copy/share working. JSON renders as a collapsible, syntax-highlighted tree.
• Logs — every debugLog/AppLogger call, searchable and filterable by level.
• Info — app and device details via package_info_plus/device_info_plus.
• Performance (under More) — a live FPS/frame-time chart with jank highlighting.

Tap Minimize to shrink the panel into a small floating window. Android's back button closes whatever's open in the panel one step at a time, instead of affecting the host app underneath it. Toggle everything at runtime with CorextraDevTools.instance.enabled.

Planned: a widget/layout inspector, memory heap snapshots, a storage viewer, and a route/navigation inspector.

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Getting Started

Add the dependency:

dependencies:
  corextra: ^1.2.8

Import it:

import 'package:corextra/corextra.dart';

Example

A runnable demo app lives in example/, including the DevTools panel:

cd example
flutter pub get
flutter run