JSON to TypeScript
Infer TypeScript interfaces or types from JSON samples. Nested interfaces, optional nulls, readonly, export toggle, and .json import.
Valid JSON
Nested objects become separate interfaces when Named nested types is on. Null values become optional properties. Mixed-type arrays become union element types.
How it works
Paste or import JSON
Paste a JSON sample or import a .json file up to 10 MB. Invalid JSON is flagged live before you convert.
Choose output shape
Pick interface or type alias, set the root name (e.g. ApiResponse), and toggle export, nested interfaces, optional nulls, or readonly properties.
Convert and export
Click Convert (counts toward the daily limit). Copy the TypeScript or download a .ts file.
Why generate TypeScript from JSON?
APIs and config files often arrive as JSON. JSON to TypeScript is part of Easy24’s developer toolbox. Your input stays in this tab for normal use; Easy24 does not upload that content to process it. This tool has no daily free-plan cap; use it as often as you need. Typical flow: Paste JSON or import a .json file, set the root type name and options, click Convert, then copy or download the TypeScript. Related tools and reverse conversions appear on the page when a follow-up step is common.
Why use this tool
- Interface or type alias output
- Auto-named nested interfaces
- Optional properties for null values
- Union types for mixed arrays
- Import .json files
- Unlimited use with no daily cap
Questions
What does JSON to TypeScript generate?
TypeScript interfaces or type aliases inferred from the shape of your JSON: strings, numbers, booleans, arrays, and nested objects.
How are nested objects handled?
With Named nested types enabled, each nested object becomes its own interface (e.g. ApiResponseMeta) referenced from the root.
What about null values?
With Optional nulls enabled, properties that are null in the sample become optional (?) in the output.
Can I use this for API responses?
Yes. Paste a sample API JSON response, name the root type, and paste the generated types into your project.
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When to use JSON to TypeScript
People reach for JSON to TypeScript when a quick job should not require installing desktop software or creating an account. Infer TypeScript interfaces or types from JSON samples. Developer utilities remove friction from small tasks: formatting, snippets, colors, loaders, and other front-end helpers. Compared with installing a desktop suite only for json to typescript, a dedicated page keeps the interface small and the intent obvious. Quota cookies may still track anonymous daily free-plan uses. That is different from receiving your file bytes or pasted text. This page has no daily free-plan cap, so you can run it as often as you need. If a free-plan limit applies, the workspace shows remaining uses before you commit a download, so you are not surprised after a long wait.
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