Instantly convert raw JSON data into clean TypeScript Interfaces. Paste your API
response or JSON payload to generate accurate static types for your TS projects.
Try:
JSON to TypeScript Types
Paste JSON, get typed interfaces
instantlyDev Tools
Output style
Root name
Null handling
Date strings
Enum detection
Export
Readonly
Interfaces
TypeScript Output
Output will appear here…
Interfaces
—
Fields
—
Optional
—
Unions
—
Samples
—
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Basic Usage
Paste any JSON object and types are generated instantly. Nested objects become named
interfaces. Arrays of objects become typed arrays of that interface.
Multiple Samples
Click + Sample to add more JSON responses from the same endpoint. Fields missing
in some samples are marked optional (?). This reveals optional fields a single sample can't
show.
Output Styles
interface — classic TypeScript interface type alias — type Root = { ... } Zod schema — z.object({...}) for runtime validation
Null Handling
Type | null — explicit null union optional (?) — marks field optional ignore — treats null as the base type only
Enum Detection
When the same string field has only a few distinct values across all samples, the tool
suggests a string literal union: 'active' | 'inactive' | 'pending' instead of just
string.
Click to Copy
Click any individual interface block in the output to copy just that interface. Use
Copy All to copy the entire output at once.
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How to use
Open the tool and enter your data or select options.
Adjust settings to see real-time updates.
Copy the generated result to your clipboard.
Frequently Asked Questions
How does it handle nested objects?
Nested objects are automatically extracted into their own named interfaces to keep your code clean and modular.
What if an array has mixed types?
The
tool will attempt to union the types (e.g., `string | number`) if it detects different data types within a
single array.
Is my data sent to a server?
No,
all parsing and type generation happens locally in your browser. Your JSON data remains completely private.
Did you know?
TypeScript was developed by Microsoft and first released in 2012 by Anders Hejlsberg, the lead architect of
C#.
TypeScript types are completely erased during compilation; they don't affect runtime behavior.
Generating types from JSON is a common practice when integrating with third-party REST APIs that lack SDKs.