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TypeScript Interface to Zod Schema Generator (Runtime Type Inference)

Convert TypeScript interfaces, type aliases, enums, and nested types into runtime Zod schema validation rules with type inference.

Presets:
Naming:
0 Types0 Fields
TypeScript Source Code (Interfaces, Types & Enums)
Lines: 39Chars: 745Size: 0.7 KB
AST Ready
// Paste TypeScript interfaces, type aliases, or enums to generate Zod schemas.
Output: 1 linesSchemas: 0Zod v3.23+ Compliant
Zero Server Transmission
0
Parsed Definitions
0
Validated Properties
100%
Zod Inference Ready

100% Client-Side AST Synthesis

Parse TypeScript interfaces, type aliases, and enums entirely in-browser with zero telemetry or remote server requests.

Zod v3 Runtime Type Inference

Generates recursive z.object, discriminated unions, optional/nullable handling, and export type z.infer<typeof Schema>.

Interactive Mock Validation & AST

Validate realistic mock payloads against generated schemas instantly and inspect full schema structural metadata.

Technical Reference & Architecture Guide

TypeScript Interface to Zod Schema Generator (Runtime Type Inference) — Reference Guide

Convert TypeScript interfaces, type aliases, enums, and nested types into runtime Zod schema validation rules with static type inference.

Key Parameters & Controls

Schema Validation ModeEnum (strip | strict | passthrough)

Configures how undefined object properties are handled during validation. 'strip' discards unknown keys, 'strict' throws a validation error upon finding unexpected keys, and 'passthrough' preserves them.

Default: strip
Type Inference ExportBoolean (true | false)

Appends static TypeScript type definitions inferred directly from generated Zod schemas using 'z.infer<typeof Schema>', ensuring flawless compile-time and runtime type alignment.

Default: true
Primitive Coercion ModeBoolean (true | false)

Emits Zod primitive coercion utilities ('z.coerce.string()', 'z.coerce.number()', 'z.coerce.date()', 'z.coerce.boolean()'), ideal for HTTP query parameters, FormData payloads, and environment variables.

Default: false
Nullability StrategyEnum (nullish | explicit | strict-optional)

Governs the mapping of optional and null-union fields: 'nullish' converts 'prop?: T | null' into '.nullish()', whereas 'explicit' generates chained '.nullable().optional()'.

Default: nullish

Pro Tips & Best Practices

Recursive Schemas with z.lazy()

For recursive data structures like comment threads, AST nodes, or category trees, wrap circular properties in 'z.lazy(() => TargetSchema)' and annotate the root schema variable with an explicit TypeScript type ('const NodeSchema: z.ZodType<Node> = z.lazy(...)') to break compilation circularity.

When validating union types sharing

When validating union types sharing a discriminant discriminator key (such as 'kind' or 'type'), prefer 'z.discriminatedUnion('type', [SchemaA, SchemaB])' over generic 'z.union([...])'. This boosts parsing speed from O(N) to O(1) and delivers pinpoint error diagnostics identifying the exact failing variant.

Single Source of Truth with z.infer

Replace manually maintained TypeScript interfaces with 'export type User = z.infer<typeof UserSchema>;'. Deriving types from runtime schemas guarantees that validation rules, default fallback values, and transformed attributes never drift from compile-time contracts.

ISO Date and Boundary Refinements

When parsing incoming JSON where JavaScript Date objects are serialized into ISO-8601 strings, pair 'z.string().datetime()' or 'z.coerce.date()' with custom '.refine()' validations to enforce domain boundary constraints such as expiration checks or business logic thresholds.

Common Gotchas & Troubleshooting

TS2454 or circular reference compilation error with self-referencing types

Wrap recursive properties inside 'z.lazy(() => SchemaName)' and provide an explicit type annotation on the schema declaration ('const Schema: z.ZodType<InterfaceType> = ...') so TypeScript does not evaluate the schema variable before assignment.

TypeScript index signature [key: string]: any losing validation strictness

Convert general index signatures using 'z.record(z.string(), z.unknown())' for pure dictionaries, or append '.catchall(z.unknown())' to an existing 'z.object({...})' declaration to permit supplementary dynamic attributes alongside fixed typed fields.

String literal unions generating incorrect z.nativeEnum calls

Ensure string literal unions (e.g., type Status = 'active' | 'inactive') are parsed using 'z.enum(['active', 'inactive'])' rather than 'z.nativeEnum()', which is reserved exclusively for TypeScript enum declarations.

Frequently Asked Questions

Why convert TypeScript interfaces into Zod schemas instead of relying on TypeScript alone?▼

TypeScript interface definitions are purely static design-time contracts that are erased during JavaScript transpilation, leaving your runtime boundaries (API endpoints, webhooks, form submissions, and database results) completely unprotected. Zod enforces runtime parsing, data sanitization, and actionable error messages while exporting static types via 'z.infer'.

How does the converter handle optional fields vs nullable types?▼

Optional attributes marked with '?' ('name?: string') map to 'z.string().optional()', accepting 'string | undefined'. Explicitly nullable unions ('name: string | null') map to 'z.string().nullable()'. Fields combining both ('name?: string | null') are mapped to 'z.string().nullish()'.

Can generic TypeScript interfaces like PaginatedResponse<T> be converted?▼

Yes. Generic interfaces are translated into schema factory helper functions (e.g., '<T>(itemSchema: z.ZodType<T>) => z.object({ items: z.array(itemSchema), total: z.number() })'), allowing parameterized schemas with total type safety.

Is any source code or interface definition sent to external servers?▼

No. The entire conversion process executes 100% locally in your browser using client-side TypeScript AST parsing. Your proprietary data contracts, domain interfaces, and confidential schema topologies never touch a network connection or backend server.

Are generated Zod schemas compatible with tRPC, React Hook Form, and Next.js Server Actions?▼

Yes. Standard Zod schemas generated by this tool integrate seamlessly with '@hookform/resolvers/zod', tRPC input queries/mutations, and Next.js Server Actions with zero external modifications.

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