Frontend Frameworks

metro-config

Config parser for Metro, the JavaScript transformer and bundler.

Status
Generally available
Last checked
Checked · Oct 12, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

Metro is a fast JavaScript bundler used primarily in React Native projects. metro-config provides configuration parsing capabilities to customize how Metro operates within these environments.

metro-config is specifically designed to work with Metro, providing developers working on React Native projects with precise control over their build configurations.

When it fits — and when it doesn’t

A good fit for

  • React Native developers who need to customize their build process using Metro

  • Projects requiring specific configuration settings for the Metro bundler

Look elsewhere if

  • Projects not utilizing React Native or Metro as a JavaScript transformer and bundler

  • Developers looking for a general-purpose configuration tool outside of the context of React Native

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Steep learning curve for non-JavaScript developers

    metro-config heavily relies on JavaScript and React Native ecosystem patterns, which may be unfamiliar to developers from other backgrounds.

  2. 02

    Limited documentation and examples

    The official documentation lacks comprehensive guides and practical examples for advanced use cases of metro-config.

  3. 03

    Frequent breaking changes between versions

    Upgrading to newer versions often requires significant updates in configuration files due to API changes, causing disruptions in development workflows.

  4. 04

    Performance issues with large projects

    Metro bundler can become slow and resource-intensive when dealing with large codebases, impacting developer productivity during build processes.

What it does well

  • Customizable configuration for Metro bundler

  • Integration with React Native projects

  • Supports JavaScript and TypeScript

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up metro-config

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →