Package.json Validator
Inspect, validate, and debug your Node.js manifest configuration files for syntax errors, missing mandatory properties, and semver versioning format issues.
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Validation Standard Guidelines
1. Mandatory Properties
A valid package manifest requires both a name and a version string field to be recognized by npm registries.
2. Naming Restrictions
Package names cannot contain capital letters, spaces, or special characters, and must be URL-safe under npm repository guidelines.
Frequently Asked Questions (FAQ)
JSON requires strict adherence to double-quote syntax and trailing comma rules. A single stray comma or missing quote will prevent npm from parsing dependencies correctly.
Package names must be lowercase, shorter than 214 characters, and cannot start with a dot or underscore. They may contain hyphens or periods.
Version numbers and range specifiers (like
^1.0.0 or ~2.1.0) must follow proper version formatting so package managers can correctly resolve updates.