gem-hunter

Generate JavaScript/TypeScript code for Drizzle Zod schemas

This library was born in response to a need discussed in drizzle-orm issue #941: generating static validation schemas (i.e. Zod) from Drizzle ORM models without bundling Drizzle into the client.

• 🔄 It extracts schema logic from Drizzle models and outputs Zod code using zod-to-code.
• 🔐 This keeps your frontend secure by removing ORM logic from client builds.
• 🧩 Great for full-stack apps that share validation between backend and frontend.

⚠️ Why dynamic Zod schemas are not always ideal

When sharing validation between server and client, using dynamic (runtime) Zod schemas, generated with drizzle-zod can lead to several issues:

• 🔓 Risk of code leakage – Dynamic schemas created with createInsertSchema or similar rely on Drizzle's runtime logic. When used in frontend code, this can unintentionally bundle server-only logic into the client, potentially exposing sensitive code or internal database structures.
• 🐘 Large bundle size – Including Drizzle ORM in the client pulls in unnecessary dependencies, increasing bundle size and hurting performance.

Static schema generation avoids all of these issues.

npm i @lucaconlaq/drizzle-zod-to-code

npx drizzle-zod-to-code generate --out ../schemas/src/

• --config <path> - Path to drizzle.config.ts (default: "drizzle.config.ts")
• --out <path> - Path for generated Zod schemas (default: "src/schemas")
• --ts-config <path> - Path to tsconfig.json (default: "tsconfig.json")
• -h, --help - Display help for command

You can add it to your package.json scripts:

{
  ...
  "scripts": {
    ...
    "drizzle:generate": "drizzle-kit generate",
    "drizzle:migrate": "drizzle-kit migrate",
    "drizzle:push": "drizzle-kit push",
    "drizzle:pull": "drizzle-kit pull",
    "drizzle:studio": "drizzle-kit studio",
    "drizzle:generate:zod": "drizzle-zod-to-code generate --out ../schemas/src/"
  }
}

Then you can run:

npm run drizzle:generate:zod

This is an initial release focused on the most common use cases. While it provides a solid foundation for generating static Zod schemas from Drizzle models, it does not cover all the use-cases that drizzle-zod support. If you find a bug, please consider contributing.

The test suite in test/drizzle/ mirrors the test suite of drizzle-zod. Here's a summary of the current test coverage across different databases: