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Table of Contents
Using Composer Require
Manually Editing composer.json (Advanced)
Handling Development Dependencies
Home Development Tools composer How do I add a dependency to my composer.json file?

How do I add a dependency to my composer.json file?

Jul 10, 2025 am 10:55 AM
composer

To add dependencies to composer.json, the most common method is to use the composer require command, followed by manually editing the composer.json file. 1. Use composer require vendor/package to automatically add the latest stable version dependencies and install them; 2. You can specify a version such as composer require vendor/package: 1.2.3 or use constraints such as ^2.0; 3. This command will synchronize the update of composer.json and composer.lock and automatically handle the dependencies; 4. Manually edit suitable for batch addition or template projects, and you need to maintain the version yourself and run composer install; 5. Development dependencies can be added to the require-dev area through the --dev flag to keep the production environment simple; 6. Always submit composer.json and composer.lock to version control to ensure consistency.

To add a dependency to your composer.json file, the easiest and most common way is to use the composer require command followed by the package name and optionally a version constraint. This will automatically update your composer.json and install the package along with its dependencies.

Using Composer Require

The simplest and most widely used method is:

 composer requires vendor/package

This tells Composer to fetch the latest stable version of the package and add it to your composer.json . If you want to specify a particular version, you can do:

 composer requires vendor/package:1.2.3

Or even use version constraints like:

 composer requires vendor/package:^2.0

Composer will resolve the best match based on your constraint and update your composer.lock accordingly.

  • It updates both composer.json and composer.lock
  • Installs the package immediately
  • Handles dependencies automatically

If you're working in a team or deploying to different environments, always commit both composer.json and composer.lock to version control.

Manually Editing composer.json (Advanced)

Sometimes you might want to edit composer.json directly, especially if you're setting up a project from scratch or managing multiple dependencies at once.

Open your composer.json file and find the "require" section. Add the package name and version constraint like this:

 {
    "require": {
        "vendor/package": "^1.0"
    }
}

After saving the file, run:

 composer install

This installs all dependencies listed in composer.lock , or generates a new lock file if it doesn't exist.

  • Useful when you want to batch-add dependencies
  • Good for templated projects or CI/CD setups
  • Doesn't automatically check for conflicts — be careful

Handling Development Dependencies

Some packages are only needed during development, like testing tools or code linters. For these, use the --dev flag:

 composer requires --dev phpunit/phpunit

This adds the package to the "require-dev" section instead of "require" , which helps keep production installations clean.

  • Ideal for test suites, debuggers, etc.
  • Not installed by default in production unless explicitly asked ( --with-dev )
  • Keeps your live environment leaner

You can also manually edit "require-dev" just like "require" if you prefer.


That's basically how you manage dependencies in Composer. Whether you go for the command line shortcut or the manual approach depends on your workflow and needs. Just remember to always keep your lock file in sync and under version control.

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