DevBentoGenerate Zod Schema from Config JSON
Generate a Zod validation schema with TypeScript type inference from a nested configuration object. Paste config JSON and get a schema for runtime config...
// Generated by DevBento — json-to-typescript
interface RootApp {
name: string;
version: string;
debug: boolean;
}
interface RootDatabaseCredentials {
user: string;
password: string;
}
interface RootDatabase {
host: string;
port: number;
credentials: RootDatabaseCredentials;
}
interface RootFeatures {
darkMode: boolean;
maxConnections: number;
allowedOrigins: string[];
}
interface Root {
app: RootApp;
database: RootDatabase;
features: RootFeatures;
}Generate Zod Schema from Config JSON
This example converts a nested application config into a Zod validation schema with TypeScript type inference. The pre-filled JSON has app settings, a database section with credentials, and feature flags. Zod mode is pre-selected, so the schema appears as soon as the page loads.
What You Get
The tool produces:
RootSchemawithz.object()for the top-level configRootDatabaseSchemaandRootDatabaseCredentialsSchemafor the nested database sectionRootFeaturesSchemafor feature flags, including the allowed origins array- Zod primitives:
z.string(),z.number(),z.boolean(),z.array(z.string()) - TypeScript types exported via
z.infer<typeof SchemaName> - Import statement for
zodincluded
How to Use
- The example loads with a sample application config and Zod mode pre-selected
- Inspect the generated schema and the inferred types
- Copy the code into your TypeScript project (install zod first:
npm install zod) - Replace the sample with your actual config JSON to generate a schema for your own settings
Real-World Pattern
The fail-fast config pattern: build the config object from env vars or a file, parse it with the schema at the top of your entrypoint, and crash immediately with a readable error if anything is wrong. Every other module imports the inferred type, so the config shape is defined once and enforced both at runtime and compile time.
Environment variables are strings
Environment variables always arrive as strings, even for numbers and booleans. If your config comes from process.env, add z.coerce.number() for ports and limits, and a boolean preprocessing step for flags. The generated schema gives you the structure to hang those refinements on.
Safe error reporting
When validation fails in production, log the Zod issue paths, not the values. Config often contains secrets like database credentials, and issue paths (database.credentials.user) point at the problem without leaking the secret into logs.
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