⚛️ Built for React Teams

Upgrade React Without the Headache

Concurrent mode, new hooks, testing library changes — we show you exactly which dependency versions work with React 18 and 19.

16-19

React Versions

600K+

Packages Indexed

<5s

Analysis Time

99%

Accuracy

Analyze My React Project See Example Report

No credit card required • 25 free credits • Works with React 16-19

Real Problems From Real React Developers

These quotes are from r/reactjs this week. Sound familiar?

⚡

"Upgraded to React 18 and now half my testing library setup is broken"

r/reactjsTesting Library Compatibility

🔄

"StrictMode double-rendering exposed bugs in every third-party component"

r/reactjsConcurrent Mode Issues

📦

"Our UI library doesn't support React 18 yet but we need the new features"

r/reactjsComponent Library Timing

🎭

"Redux, React Query, Zustand — which versions work with React 19?"

r/reactjsState Management Compatibility

🧪

"Our enzyme tests all broke when we upgraded. Now we have to migrate to testing-library too"

r/reactjsTest Migration

💥

"MUI v4 to v5 was already painful, and now v6 drops React 17 support"

r/reactjsMUI Breaking Changes

React Upgrades Are More Than Just react@19

The React core upgrade is easy. Your ecosystem dependencies are the real challenge.

Feature

Manual

DepFixer

Updates react and react-dom

Handles @testing-library versions

Checks Redux Toolkit compatibility

Validates React Router versions

Checks MUI/Chakra compatibility

Detects TanStack Query alignment

Finds peer dependency conflicts

Shows concurrent mode requirements

Generates fixed package.json

From Upgrade Anxiety to Upgrade Confidence

Three simple steps to know exactly which versions work together

Run DepFixer Migrate

Run the migrate command and select your target React version. We detect your framework and show available upgrade paths.

Terminal

$ npx depfixer migrate

⚡ DepFixer CLI v1.0.0

──────────────────────────────────────────────

📦 PROJECT: my-react-app

Framework: React 17.0.2

Select target version:

> React 19 (Latest)

-> 19.0.0 - Latest stable

Review Migration Plan

See exactly which packages need updates, breaking changes, and the cost before committing.

Migration Plan

🚀 MIGRATION PLAN: React 17 → 19

──────────────────────────────────────────────

📊 Projection:

• Health: 68/100 → 96/100

• Packages: 8 updates

• Breaking: ⚠️ 1 Major Change

PACKAGE CURRENT TARGET

──────────────────────────────────────────────

react 17.0.2 19.0.0

react-dom 17.0.2 19.0.0

@testing-library/react 12.1.5 16.0.0

@tanstack/react-query 4.0.0 5.0.0

Apply & Install

Confirm the migration and DepFixer updates your package.json. Then run npm install.

Success

✨ SUCCESS

──────────────────────────────────────────────

✓ 8 Packages Updated

✓ Backup: package.json.bak

👉 NEXT STEP:

Run the following command:

$ npm install

Complete React Ecosystem Support

We track version compatibility for the entire React ecosystem

React DOM

DOM rendering

React Router

Routing library

Redux Toolkit

State management

TanStack Query

Data fetching

@testing-library/react

Testing utilities

@testing-library/dom

DOM testing

user-event

Event simulation

Material UI (MUI)

Component library

Chakra UI

Component library

Styled Components

CSS-in-JS

Emotion

CSS-in-JS

Zustand

State management

Jotai

Atomic state

Recoil

State management

Framer Motion

Animations

React Hook Form

Form handling

+ 600,000 more npm packages in our compatibility database

Built for Real Migration Scenarios

Whether you're upgrading one app or coordinating across teams, we've got you covered

⚡Concurrent Mode

React 18 Concurrent Migration

Concurrent features

Safely adopt concurrent features without breaking existing code or third-party components.

🧪Testing

Testing Infrastructure Update

Enzyme → RTL

Upgrade testing-library ecosystem in sync with React while maintaining test coverage.

🎨UI Libraries

Component Library Alignment

MUI • Chakra • Ant

Find the right MUI, Chakra, or Ant Design version for your React version.

1M+

Packages Analyzed

<5s

Analysis Time

Major Frameworks

99%

Accuracy Rate

Ship React 19 With Confidence

Know exactly which versions work before you run npm install.

Analyze My React Project Free

No credit card required • 25 free credits • Results in seconds