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package.json Validator

Check common npm manifest structure, versions, fields, and dependency mistakes.

package.json Validator
Local input
Output
Processing…
Processed locally in your browserNo input history is saved
About this tool

Made for the task at hand.

Catch common package manifest errors with a focused structural report. Checks are intentionally narrower than every npm registry rule.

How to use

  1. Paste the complete package.json document.
  2. Review errors that make the focused validation fail.
  3. Consider warnings and the stated validation scope.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
Does this publish or install the package?

No. It only parses the supplied text and performs local structural checks.

Is a missing version always invalid?

No. Private packages may omit it, so this condition is reported as a warning rather than a universal error.

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