Can it handle nested objects?

Yes. Nested objects generate their own named interfaces (e.g. Address, ContactInfo) and are referenced by name in the parent interface.

What TypeScript types are generated?

string, number, boolean, null, any[], object interfaces, and union types like string | null. Arrays of objects generate typed arrays with child interfaces.

Does it support arrays of objects?

Yes. Arrays of objects generate a named child interface for the item type, then type the field as ChildType[].

Yes, completely free with no sign-up. All processing happens in your browser — no data is sent to any server.

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 TypeScript Interface Generator

Convert JSON to TypeScript interfaces instantly. Paste any JSON object or array and get fully-typed TypeScript interfaces with nested types, optional fields, and readonly modifiers — all in your browser.

JSON → TypeScript Interface Generator

Root interface name

Optional fields (?) for null/undefined values

Use type alias instead of interface

readonly modifier

What does this tool do?

This tool takes a JSON object or array and generates TypeScript interface or type alias definitions. It handles nested objects (generating child interfaces), arrays, union types, and optional fields — saving you time and reducing manual type errors.

Optional fields

When optional fields mode is enabled, any property whose value is null or that appears missing in some array items will be marked with the ? optional modifier. This is useful when your JSON comes from an API that omits or nulls some fields inconsistently.

interface vs type

Both interface and type aliases work for describing object shapes in TypeScript. Interfaces are open (can be extended/merged), while type aliases support union and intersection types. Use type when you need advanced type operations; use interface for straightforward object shapes.

Why use JSON to TypeScript online?

JSON to TypeScript 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 your JSON object or array into the input area.
Optionally set the root interface name, toggle optional fields, and choose interface vs type.
Click Generate TypeScript to produce the typed definitions.
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 TypeScript 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 TypeScript do?: Convert JSON to TypeScript interfaces instantly. Paste any JSON object or array and get fully-typed TypeScript interfaces with nested types, optional fields, and readonly modifiers — all in your browser.
Can it handle nested objects?: Yes. Nested objects generate their own named interfaces (e.g. Address, ContactInfo) and are referenced by name in the parent interface.
What TypeScript types are generated?: string, number, boolean, null, any[], object interfaces, and union types like string | null. Arrays of objects generate typed arrays with child interfaces.
Does it support arrays of objects?: Yes. Arrays of objects generate a named child interface for the item type, then type the field as ChildType[].
Is this tool free?: Yes, completely free with no sign-up. All processing happens in your browser — no data is sent to any server.
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.