JSON → TypeScript

Generate TypeScript interfaces from JSON objects instantly.

JSON InputRoot Name:
0 chars
Output
—
🛡️Zero server logs. Conversion runs 100% inside your browser.
🛠️Developer Tool Belt
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JSON → TypeScript

Convert JSON objects into fully typed TypeScript interfaces instantly. Supports deep nesting, array detection, and custom root naming. 100% client-side.

🔒 Client-side only⚡ Web Worker processing🌐 Works offline🛡️ Zero server logs

How to Use

  1. Paste your JSON data into the input editor.
  2. Optionally change the root interface name and click Convert.
  3. Copy the generated TypeScript interface for type-safe JSON handling.

Frequently Asked Questions

Questions about this tool? We have got answers.

What TypeScript syntax does this generate?

Nested objects become child interfaces, arrays become typed arrays (e.g., string[]), and optional fields are inferred from null values.

Can I customize the root interface name?

Yes. Use the "Root Name" field in the input header to set your desired root name.

Is my JSON data sent to any server?

No. All conversion runs 100% client-side via a Web Worker.

Automated E2E Test Suite Logs

Our build systems validate edge-case processing under extreme conditions before each deployment.

Stability
100.0%
Passed
29/29
Env
V8-Sandbox
Engine: Vitest RunnerUpdated: 2026/6/10 02:04:12📦 Download Test Datasets
PASStoPascalCase should convert simple word
PASStoPascalCase should convert snake_case
PASStoPascalCase should convert kebab-case
PASStoPascalCase should preserve existing PascalCase
PASStoPascalCase should handle empty string
PASStoPascalCase should handle special chars
PASSjsonToTypeScript should generate simple interface from fixture
PASSjsonToTypeScript should generate nested interfaces from fixture
PASSjsonToTypeScript should generate type alias for array root from fixture
PASSjsonToTypeScript should handle mixed types from fixture
PASSjsonToTypeScript should handle empty object from boundary fixture
PASSjsonToTypeScript should generate type alias for scalar root from boundary fixture
PASSjsonToTypeScript should not mutate input string
PASSjsonToTypeScript should throw on invalid JSON
PASSjsonToTypeScript should handle deeply nested structures
PASSjsonToTypeScript should handle null values
PASSjsonToTypeScript should handle boolean fields
PASSjsonToTypeScript should protect numeric zero
PASSjsonToTypeScript should handle empty arrays
PASSjsonToTypeScript should handle duplicate key names at different depths
PASSJsonToTypescriptTool renders Convert button
PASSJsonToTypescriptTool renders JSON Input label
PASSJsonToTypescriptTool renders Output label
PASSJsonToTypescriptTool renders Clear All button; Copy hidden until output exists
PASSJsonToTypescriptTool shows Root Name input field
PASSJsonToTypescriptTool renders JSON input textarea
PASSJsonToTypescriptTool shows privacy strip
PASSJsonToTypescriptTool shows toast on Convert click with empty input
PASSJsonToTypescriptTool shows Clear toast on Clear All click
⏱️ 0.18ms📦 1.5KB🎚️ Max Nesting: 3🌿 AST Nodes: 48🛡️ V8 Heap: Healthy
$ codecaven-validator --scope=tool● CLUSTER COMPLIANT

Tool Changelog & Updates

1.0.02026-06-09
  • Feature: Initial release