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FREE DEVELOPER TOOLS

Less guessing.
Working installs.

Small tools for registry authentication, package delivery and the errors in between. Use your own registry. No account needed.

Local processing. No configuration uploads, tracking or session replay on these tools.

01 / BROWSER TOOL

Registry auth checker

Generate npm, pnpm and Yarn authentication setup. Inspect redacted .npmrc configuration for routing and credential mistakes.

Open tool →02 / BROWSER TOOL

Lockfile registry inspector

Find registry and tarball hosts in npm, pnpm and Yarn lockfiles. Spot old hosts and insecure URLs before a registry migration.

Open tool →03 / BROWSER TOOL

Private install troubleshooter

Work through npm E401, E403, E404 and tarball failures. Get the next diagnostic step for your private package install.

Open tool →04 / BROWSER TOOL

Clean recipient test generator

Generate an isolated npm install check with a fresh cache, exact package version and read-only credential placeholder.

Open tool →

Try a complete package workflow

Our guides take you from a small JavaScript package to a verified install with separate recipient access.

Open the quickstart →