fake-console

Simulate realistic developer console outputs like npm install, server startup, build logs, CI jobs, test runners, and more — all with a simple JavaScript function.

Ideal for:

• Demos
• Tutorials
• Mock dev tools
• UI testing
• CLI projects
• Educational apps

Installation

npm install fake-console

Usage/Examples

const {
  simulateNpmInstall,
  simulateYarnInstall,
  simulateExpressServer,
  simulateGitPush,
  simulateDockerBuild,
  simulateErrorStack,
  simulateReactBuild,
  simulateAngularBuild,
  simulateNestStart,
  simulateSpringBootRun,
  simulateDjangoRun,
  simulateViteBuild,
  simulateWebpackBuild,
  simulateVueServe,
  simulateNextJsDev,
  simulatePythonFlaskRun,
  simulateWarning,
  simulateScriptExecution,
  simulateTestRunner,
  simulateCIJob
} = require('fake-console');

(async () => {
  await simulateNpmInstall('express');
  await simulateExpressServer(3000);
  simulateErrorStack();
})();

Available Simulations

| Function | Description | | :---------------------------------- | :----------------------------------------------- | | simulateNpmInstall(pkg, duration) | Simulates npm install logs | | simulateYarnInstall(pkg, duration)| Simulates yarn add output | | simulateExpressServer(port) | Logs Express server start-up | | simulateGitPush() | Simulates git push origin main | | simulateDockerBuild() | Simulates docker build and run logs | | simulateErrorStack() | Prints a fake runtime error with stack trace | | simulateReactBuild() | Simulates npm start of Create React App | | simulateAngularBuild() | Angular CLI build logs | | simulateNestStart() | NestJS app boot with dependency tree | | simulateSpringBootRun() | Spring Boot Java app logs | | simulateDjangoRun() | Django dev server log | | simulateViteBuild() | Vite dev server startup logs | | simulateWebpackBuild() | Webpack build output with chunks/assets | | simulateVueServe() | Vue CLI dev server logs | | simulateNextJsDev() | Next.js dev command output | | simulatePythonFlaskRun() | Flask app log | | simulateWarning(msg) | Display warning messages | | simulateScriptExecution() | Generic script logs (like Bash output) | | simulateTestRunner() | Simulated Jest/Mocha test logs | | simulateCIJob() | Simulates a full CI/CD job run log |

Example: NPM Install

await simulateNpmInstall(['axios', 'mongoose'], 2000);
// > npm install axios mongoose
// Installing axios...
// Installing mongoose...
// + axios mongoose added