JAVASCRIPTWarningFramework ErrorApril 25, 2026

Framework Error

Error: Unable to resolve dependency 'http-proxy-middleware' in /node_modules/react-scripts/config/webpack.dev.js

What This Error Means

This error occurs when the dependencies of a project are not properly configured, and the framework is unable to resolve a dependency required for compilation.

Why It Happens

This error typically happens when there is a mismatch in the version of 'react-scripts' and 'http-proxy-middleware', or when a package is installed globally rather than locally. It can also occur when there are conflicts between dependencies in the project.

How to Fix It

  1. 1To resolve this error, you can try the following steps:
  2. 21. Run 'npm install' or 'yarn install' to reinstall the dependencies.
  3. 32. Check the version of 'react-scripts' and 'http-proxy-middleware' in your package.json file to ensure they are compatible.
  4. 43. Remove any global packages and try installing them locally.
  5. 54. If the issue persists, try deleting the node_modules folder and running 'npm install' or 'yarn install' again.

Example Code Solution

❌ Before (problematic code)
JavaScript
import { createProxy } from 'http-proxy-middleware';
✅ After (fixed code)
JavaScript
(fixed code, assuming the issue was due to a version mismatch)
const proxy = require('http-proxy-middleware').default;

Fix for Error: Unable to resolve dependency 'http-proxy-middleware' in /node_modules/react-scripts/config/webpack.dev.js

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