How to Convert JSON to TypeScript & Zod Schemas
Generate strong types in four simple steps:
Paste JSON
Paste your API response or data object into the left input box.
Set Root Name
Specify the root interface name (e.g. `UserData` or `ApiResponse`).
Choose Output
Select TypeScript Interface, Type alias, or runtime Zod Schema.
Copy or Download
1-click copy or download clean `.ts` definition files into your codebase.
Key Features & Type Safety
Deep Nested Resolution
Extracts deeply nested child objects into cleanly organized standalone sub-interfaces.
Zod Validation Generator
Generates runtime Zod schemas for strict backend and API payload validation.
Optional & Readonly Toggles
Instantly add `?` optional flags or `readonly` immutability modifiers across all properties.
100% In-Browser Privacy
Your confidential API tokens, client records, and database rows are never uploaded to servers.
Instant Syntax Checking
Identifies malformed JSON quotes or trailing commas instantly with detailed error tags.
1-Click .TS Download
Export formatted `.ts` type files ready to drop into Next.js or Astro projects.
Why Strong Typing with TypeScript & Zod Prevents Production Bugs
In modern full-stack development, trusting external JSON responses without type safety leads to `undefined is not a function` runtime crashes. Generating TypeScript interfaces and Zod schemas ensures end-to-end type safety, auto-completion in VS Code, and runtime schema validation at API boundaries.
Nextgen Astra JSON to TypeScript Generator operates completely in-browser without sending your proprietary API payloads to third-party cloud servers.
Comparison Matrix
| Feature | Nextgen Astra | Quicktype Cloud | Manual Hand Typing |
|---|---|---|---|
| Zod Schema Support | Yes (Full z.object inference) | Complex Config | Tedious / Error-Prone |
| Privacy / Security | 100% In-Browser (No Cloud) | Remote API Transmission | Local |
| Optional / Readonly Flags | 1-Click Toggles | Manual Edits | Manual |
| Cost | 100% Free Forever | Ad-Supported | Time Consuming |
Frequently Asked Questions
?How does the JSON to TypeScript converter work?
Paste your raw JSON payload on the left. The generator traverses the object hierarchy, infers primitive and nested types, resolves sub-objects into standalone interfaces, and outputs clean TypeScript code in real time.
?Can I generate Zod schemas for runtime API validation?
Yes! Select 'Zod Schema' from the output format dropdown to generate full `z.object({...})` schemas along with `z.infer<typeof ...>` TypeScript types.
?How does it handle nested objects and arrays?
Nested objects are automatically extracted into separate, cleanly named sub-interfaces (e.g. `Profile`, `StatsItem`), preventing deep messy inline object nesting.
?Are my confidential API responses or database rows uploaded anywhere?
No! All JSON parsing and AST generation execute 100% locally in your web browser memory. Your confidential API schemas never leave your device.
?Can I make all properties optional (?) or readonly?
Yes! Use the optional properties and readonly modifiers toggles in the top toolbar to adjust the generated output.