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Babel Config Generator - Online Presets & Plugins

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Babel Config Generator

Generate optimized Babel configuration for your project

⚡ Quick Templates
đź“„ Output Format
📦 Presets
@babel/preset-env

Automatically determines plugins & polyfills for target environments

@babel/preset-react

Transform JSX syntax for React applications

@babel/preset-typescript

Strip TypeScript types without type checking

@babel/preset-flow

Strip Flow type annotations

🔌 Plugins (select any)
ES2020+ / Modern Syntax
Proposals / Experimental
Optimization & Runtime
Live Preview

Configuration updates in real-time as you make changes.

Frequently Asked Questions

What is Babel and why do I need a configuration?
Babel is a JavaScript compiler that converts modern JavaScript (ES6+) into backwards-compatible code for older browsers. Configuration files (.babelrc or babel.config.js) tell Babel which presets and plugins to use, allowing you to customize the transformation for your specific project needs.
What's the difference between .babelrc and babel.config.js?
.babelrc is a JSON file for project-wide configuration (applies to files in the same directory). babel.config.js is a JavaScript file that supports dynamic configuration and applies to the entire project root, including node_modules. Use babel.config.js for monorepos or when you need programmatic configuration.
What is @babel/preset-env and why is it recommended?
@babel/preset-env is a smart preset that automatically determines which plugins and polyfills you need based on your target environments. Instead of manually selecting individual plugins, preset-env analyzes your browserslist targets and includes only the necessary transforms, keeping your bundle lean and efficient.
When should I use @babel/preset-react?
Use @babel/preset-react whenever your project uses JSX syntax. The classic runtime requires import React from 'react' in every file, while the automatic runtime (React 17+) auto-imports JSX helpers, reducing boilerplate and bundle size.
How does @babel/preset-typescript differ from tsc?
@babel/preset-typescript strips TypeScript types without performing type checking, making it much faster than tsc. It's ideal for development and bundling workflows. For type safety, you should still run tsc --noEmit separately in your CI pipeline.
What are useBuiltIns and corejs in preset-env?
useBuiltIns: 'usage' automatically imports only the polyfills your code actually uses, based on your target browsers. useBuiltIns: 'entry' requires you to manually import core-js at your entry point, and Babel replaces it with targeted polyfills. The corejs option specifies which version of core-js to use (3.x is recommended).
Can I use Babel without any configuration?
Babel requires at least one preset or plugin to do anything meaningful. Without configuration, Babel parses your code but doesn't transform it. The most minimal setup is using @babel/preset-env with default settings, which targets the default browserslist query.
How do I debug my Babel configuration?
Enable the debug: true option in @babel/preset-env to see which plugins and polyfills are being applied. You can also run Babel with the BABEL_SHOW_CONFIG_FOR=./path/to/file environment variable to inspect the resolved configuration for a specific file.
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