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package.json Validator

Check practical package manifest fields locally without resolving, installing, or auditing dependencies.

Manifest signals150 chars
Text only · never executed or rendered
Checks practical manifest fields; it does not audit dependencies.
Package manifest preview Ready
Supported fields look valid
Name
local-toolbox
Version
1.2.3
Scripts
1
Dependencies
1

This is structural checking only. It does not resolve, install, trust, or audit a dependency.

Processed on your device

How it works & useful details

Check practical manifest shapes

The validator reads strict JSON and checks a package name, SemVer version, private/type values, and string entries in scripts and dependency maps. It reports field concerns without changing your manifest.

It does not resolve packages, install anything, contact npm, inspect licenses, or determine whether a dependency is safe, maintained, or compatible.

Private, bounded text processing

Code and markup stay as inert text in this browser. These tools do not execute JavaScript, render HTML, load URLs, install packages, contact registries, or save what you paste.

Regex patterns are limited to 500 characters and test text to 20,000 characters. Formatters and package inspection accept up to 100,000 characters; exports are capped at 200,000 characters.