Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
JSON to TypeScript Converter
Generate TypeScript interfaces and typed constants from JSON data.
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What is JSON to TypeScript Conversion?
JSON to TypeScript conversion generates TypeScript interface definitions and typed constants from JSON data. This is useful when working with API responses, configuration files, or data structures that need type safety in TypeScript projects.
This tool features:
- Interface generation — Automatically creates TypeScript interfaces from JSON objects.
- Nested object support — Generates separate interfaces for nested objects.
- Array detection — Detects arrays of objects and generates proper array types.
- Custom root name — Customize the root interface and variable name.
- Export keyword — Optionally include the
exportkeyword. - Typed constant — Generates a typed const with the correct interface type.
How to Use
- Paste your JSON — Copy and paste any valid JSON data into the input textarea. You can also click Load Example to load sample data.
- Choose settings — Select indentation, set the root interface name, and toggle the export keyword.
- Convert — Click Convert to TS to generate TypeScript interfaces and typed constant.
- Copy or download — Use the copy button on the output area or click Download .ts to save the result.
Frequently Asked Questions
How are nested objects handled?
Each nested object generates its own interface with a PascalCase name derived from the property key. For example, author.name in JSON becomes interface Author { name: string; }.
How are arrays converted?
Arrays of primitives get array types like string[] or number[]. Arrays of objects generate a singular interface name (e.g., comments → Comment) and produce Comment[].
Is this tool safe for sensitive data?
Yes. All processing happens entirely in your browser using JavaScript. Your JSON data is never uploaded to any server, stored in any database, or logged.
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Last updated: 17 Aug 2026
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