What is package.json?
package.json is the central configuration file used by Node.js and npm projects.
Developer
Package.json Validator
Validate package.json files and identify missing fields, formatting errors and dependency issues.
Tool
Package.json Validator
Validate package.json files and identify missing fields, formatting errors and dependency issues.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free package.json validator to verify Node.js project configuration files. Detect syntax issues, missing fields and common package metadata problems.
Examples
- {"name":"my-app","version":"1.0.0"}
- {"private":true,"scripts":{"dev":"vite"}}
- {"dependencies":{"react":"^19.0.0"}}
Frequently Asked Questions
Why validate package.json?
Validation helps identify malformed JSON, missing metadata and configuration issues.
Can dependency definitions be checked?
Yes. Dependency and script sections can be inspected for common problems.
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