Does it handle nested objects?

Yes. Nested objects are converted to nested z.object({...}) or yup.object({...}) schemas inline — no separate type declarations needed.

What happens to null values?

Null values are represented as z.null() in Zod, or yup.mixed().nullable() in Yup, since the true underlying type cannot be inferred from the JSON sample alone.

What is Zod strict mode?

Calling .strict() on a Zod object schema makes it throw a validation error if the input contains keys not present in the schema. It is useful for APIs where unexpected extra fields should be rejected.

Does it support arrays of objects?

Yes. Arrays of objects generate z.array(z.object({...})) for Zod or yup.array().of(yup.object({...})) for Yup, with the nested schema inferred from the first item.

Yes — completely free, no sign-up required. All schema generation happens locally in your browser.

Is this tool free to use?

Yes. All Skybin developer tools are free with no account, API key, or usage limits.

Does my data get sent to a server?

No. Processing runs in your browser whenever possible. Sensitive input never leaves your device unless a tool explicitly fetches a URL you provide (e.g. OG Validator).

Can I use this on mobile?

Yes. The tools work in modern mobile browsers, though a desktop screen is easier for large JSON or PDF workflows.

How is this different from desktop apps?

There is nothing to install or update. Open a bookmarked URL and start working — ideal for quick tasks during development or support calls.

Are there keyboard shortcuts?

Most tools support standard paste (Ctrl+V / Cmd+V) and select-all in text areas. Copy buttons provide one-click output.

Does Skybin store my history?

No. We do not log tool inputs or outputs. Refreshing the page clears in-memory state unless the tool encodes state in the URL.

免费工具

JSON to Zod / Yup Schema Generator

Convert any JSON object or array into a Zod or Yup validation schema instantly. Handles nested objects, arrays, null values, and union types — all in your browser, no sign-up needed.

JSON → Zod / Yup Schema Generator

Variable name

Strict mode (.strict())

What does this tool do?

This tool reads a JSON object or array and generates a matching runtime validation schema for either Zod or Yup. It handles all primitive types (string, number, boolean, null), nested objects, arrays of any type, and null-union fields — saving you the tedium of hand-writing schemas for API responses or form payloads.

Zod vs Yup

Zod is a TypeScript-first schema library that infers static types from your schema, making it ideal for full-stack TypeScript projects. Yup is the classic choice for React form validation (especially with Formik), offering a fluent chainable API. Both produce equivalent runtime validation logic — choose whichever your project already uses.

Handling null values

When a JSON field is null, the tool cannot determine the true runtime type. In Zod, null fields are generated as z.union([z.TYPENAME(), z.null()]) or z.null() when no other type hint is available. In Yup, null fields become yup.mixed().nullable(). Enable 'Required fields' for Yup to append .required() to every field.

Why use JSON to Zod / Yup Schema online?

JSON to Zod / Yup Schema in the browser saves context switching: no CLI install, no fragile one-liners, and instant feedback for teammates who do not live in the terminal. It is ideal for debugging, demos, and quick checks during code review.

Tips for best results

Work with a sample payload first, then paste production data. Keep privacy in mind: prefer local browser processing for secrets, tokens, and customer data. Bookmark this page for faster access next time.

How to use

Paste a JSON object or array into the input area.
Choose Zod or Yup output using the toggle.
Optionally set the variable name and enable strict mode (Zod) or required fields (Yup).
Click Generate Schema to produce the schema code.
Click Copy to copy the result to your clipboard.
Review the output and use Copy to paste into your editor, ticket, or chat.
Need another utility? Scroll to Related Tools below for JSON to Zod / Yup Schema companions on skybin.io.
For a deeper walkthrough, read the linked Skybin blog article at the bottom of this page.

在线工具与终端对比

终端 / CLI	本工具
Install CLI tools or write a one-off script	Open the tool in your browser — no install
Look up flags in man pages or Stack Overflow	Paste input or upload files where supported
Repeat for each file format or edge case	Get instant visual feedback and copy buttons

Your JSON stays in your browser — no data is sent to any server.

来自 Skybin 博客

Free developer tools from Skybin

在 Skybin 阅读指南

常见问题

What does JSON to Zod / Yup Schema do?: Convert any JSON object or array into a Zod or Yup validation schema instantly. Handles nested objects, arrays, null values, and union types — all in your browser, no sign-up needed.
Does it handle nested objects?: Yes. Nested objects are converted to nested z.object({...}) or yup.object({...}) schemas inline — no separate type declarations needed.
What happens to null values?: Null values are represented as z.null() in Zod, or yup.mixed().nullable() in Yup, since the true underlying type cannot be inferred from the JSON sample alone.
What is Zod strict mode?: Calling .strict() on a Zod object schema makes it throw a validation error if the input contains keys not present in the schema. It is useful for APIs where unexpected extra fields should be rejected.
Does it support arrays of objects?: Yes. Arrays of objects generate z.array(z.object({...})) for Zod or yup.array().of(yup.object({...})) for Yup, with the nested schema inferred from the first item.
Is this tool free?: Yes — completely free, no sign-up required. All schema generation happens locally in your browser.
Is this tool free to use?: Yes. All Skybin developer tools are free with no account, API key, or usage limits.
Does my data get sent to a server?: No. Processing runs in your browser whenever possible. Sensitive input never leaves your device unless a tool explicitly fetches a URL you provide (e.g. OG Validator).
Can I use this on mobile?: Yes. The tools work in modern mobile browsers, though a desktop screen is easier for large JSON or PDF workflows.
How is this different from desktop apps?: There is nothing to install or update. Open a bookmarked URL and start working — ideal for quick tasks during development or support calls.
Are there keyboard shortcuts?: Most tools support standard paste (Ctrl+V / Cmd+V) and select-all in text areas. Copy buttons provide one-click output.
Does Skybin store my history?: No. We do not log tool inputs or outputs. Refreshing the page clears in-memory state unless the tool encodes state in the URL.