JSON input
valid
Zod output
Paste a package.json JSON payload and get a Zod z.object schema you can run inside your handler. Same shape walker as the TypeScript-mode page, but the output is a runtime-validated schema with .optional() on missing fields and z.union for nullables.
Tools that read package.json (build wrappers, monorepo managers, registry analyzers) crash hard when a manifest is malformed or uses an unfamiliar field shape. A parse turns a malformed exports map into one named error at the top of the tool, not a deep-property crash twenty calls in.
Tools that read package.json are typically Node CLIs and build scripts where startup time is dominated by the npm resolver, not the validator — Zod's chained API is the more familiar choice for the typescript-first audience that builds these tools. The output is a copy-paste-runnable z.object using only standard Zod primitives (z.string, z.number, z.array, z.union, .optional). Drop it into your handler, run schema.parse(body), and the rest of your code consumes a strongly typed value with no ambient unknowns.