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The manifest file that lists a JavaScript project’s scripts, dependencies, metadata, and package settings.
package.json is where a Node project says how to run itself. It contains scripts like dev and build, dependencies like next or react, and project metadata. If an agent says “run the build,” it usually reads this file to find the command.
Plainly
Think of package.json as a tool from the builder toolbox. The manifest file that lists a JavaScript project’s scripts, dependencies, metadata, and package settings.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.