MongoDB ObjectId Generator
Generate and decode MongoDB ObjectIds, including their embedded timestamp.
package.json Generator
Build a valid package.json with scripts, exports and metadata.
Module system
Quick Tool Overview
The package.json Generator builds a valid manifest with the module fields set correctly — type, main and the exports map — which is where most package.json problems actually come from, and where a generator earns its place.
- What it does
- Generates a valid package.json
- You give it
- A name, a preset and your dependencies
- You get back
- A manifest npm and Node both read correctly
- Best for
- Starting a package or a published library
About the package.json Generator
package.json is small enough to write by hand and structured enough to get wrong. This builds a valid one from the fields you fill in, with the script preset for your kind of project and the metadata npm actually reads.
The fields that cause the most trouble are the ones about module resolution. `\"type\": \"module\"` decides whether your .js files are ESM or CommonJS, and getting it wrong produces the "Cannot use import statement outside a module" error that has no obvious cause. For a library, the `exports` map is what lets one package serve ESM, CommonJS and TypeScript types from the same install — and it replaces `main` rather than sitting beside it, which is why this generates both correctly rather than leaving you to work out the precedence.
Key features of the package.json Generator
The exports map done properly
Types, import and require in the right order, so one package serves ESM, CommonJS and TypeScript from a single install.
Module type made explicit
The field behind "Cannot use import statement outside a module" is set deliberately rather than left to chance.
Script presets
Node, Vite, Next.js, Express, TypeScript or a published library — the scripts each of those actually needs.
Repository fields derived
Give it a GitHub path and repository, bugs and homepage are all filled in the shape npm expects.
Valid JSON, always
Built as an object and serialised, so no trailing comma or unquoted key can slip in.
How to use the package.json Generator
-
1
Name and version it
The package name, a starting version and a one-line description.
-
2
Pick a script preset
Plain Node, Vite, Next.js, Express, TypeScript or a published library.
-
3
Add dependencies
One per line as name@range — they are split into the right sections.
-
4
Copy the manifest
Save it as package.json in your project root.
Frequently asked questions
It makes every .js file in the package an ES module, so import and export work and require does not. Leave it out and the opposite is true. Files named .mjs and .cjs override it either way.
Keep it for older tooling, but exports wins wherever it is supported — and it is stricter: anything not listed in the map cannot be imported at all, which is the point. It is how a package stops people reaching into its internals.
It makes npm refuse to publish the package. For an application, a website or anything in a monorepo that should never go to the registry, it is the cheapest insurance against an accidental npm publish.
Use ranges in package.json and let the lock file do the pinning. That way a fresh install reproduces exactly what you tested, while npm update is still able to bring in patches when you ask for them.
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