JSON to TypeScript Converter
Convert JSON objects into TypeScript interfaces instantly. This free JSON to TypeScript converter runs directly in your browser, inferring types for nested objects, arrays and null values so you don't have to hand-write definitions for API responses or config files.
How to Use the JSON to TypeScript Converter
- 1Paste or type your JSON object into the input editor.
- 2Choose whether to generate `interface` or `type` declarations, and whether properties should be optional.
- 3Click Convert to instantly generate TypeScript definitions.
- 4Copy the result or download it as a .ts file.
Frequently Asked Questions
Is this JSON to TypeScript converter free?+
Yes, it's completely free with no usage limits.
Does the converter send my JSON to a server?+
No. All parsing and type inference happens locally in your browser — your data never leaves your device.
Can it handle nested JSON objects and arrays?+
Yes, nested objects are converted into their own named interfaces, and arrays are typed based on their element shape.
Can I generate `type` aliases instead of `interface`?+
Yes, use the output-style toggle to switch between `interface` and `type` declarations.
Can I download the generated TypeScript?+
Yes, use the Download button to save the output as a .ts file, or Copy to paste it directly into your editor.
Related Tools
JSON to Go Struct Converter
Generate Go structs with JSON tags from any JSON object.
YAML to JSON Converter
Convert YAML configuration files into formatted JSON.
Mock Data Generator
Generate realistic fake names, emails, UUIDs and more as JSON, SQL or CSV.
tsconfig.json Generator
Generate a tsconfig.json through a simple form.