Convert JSON to TypeScript Interfaces & Types Offline
Paste any REST or GraphQL API JSON response to automatically infer nested TypeScript `interface` definitions locally in your browser.
Step-by-Step Client-Side Workflow
- Paste Raw API JSON: Paste your JSON object or array into the left editor pane.
- Generate Strict TS Interfaces: Click Generate TypeScript to recursively infer property types, arrays, and nested objects.
- Copy Directly to IDE: Copy the ready-to-use `export interface RootObject` code straight into VS Code or Cursor.
Why Use VaultTools Zero-Upload Architecture
- Protect Proprietary API Payloads: Format customer records, webhook payloads, and internal database exports without uploading sensitive JSON to public pastebins.
- Eliminate Manual Typing: Convert deeply nested 500-line REST or GraphQL responses into strict TypeScript interfaces in under a millisecond.
- Handles Massive Payloads: Process multi-megabyte JSON logs directly in local RAM without hitting server request body limits.
Frequently Asked Questions
Does the generator handle deeply nested JSON objects and arrays?
Yes. The type inference engine traverses nested objects and typed arrays to produce clean, strongly typed TypeScript definitions.
Are proprietary enterprise API schemas safe to paste here?
100% safe. All parsing and AST generation execute strictly in your browser’s local JavaScript runtime.
How does the JSON to TypeScript generator handle nested objects and arrays?
VaultTools recursively analyzes every property in your JSON object, automatically extracting nested child interfaces and inferring array element types so your TypeScript code compiles cleanly.
Does formatting or validating JSON send my data to a backend server?
Never. All JSON parsing, prettifying, minifying, and TypeScript interface generation uses your browser’s built-in V8/JavaScript engine locally.
Can I minify JSON for production config files or HTTP payloads?
Yes. Click "Minify" to strip all unnecessary whitespace and newlines, reducing payload size for environment variables or network transmission.