JSON Input

TypeScript Interface

Paste your JSON on the left to instantly generate TypeScript interfaces.
Instantly generate TypeScript interfaces from JSON data. Speed up development without exposing your API structure.
Why This Tool Exists
TypeScript is great, but writing interfaces for large, complex API responses is tedious. You have a massive JSON blob and you need to type it out manually: `interface RootObject { ... }`.
										
										PrivaQuickTools JSON to Interface automates this. Paste your JSON, and we generate the corresponding TypeScript definitons (or Go structs, etc).
										
										Crucially, this runs locally. You don't want to paste your internal API schema into a cloud generator that might log your data structures.
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I wasted hours manually typing interfaces for a legacy API, only to make a typo that caused runtime errors. Auto-generating them guarantees they match the actual data.
Key Capabilities
Core features that make this tool powerful.
Privacy First: Files never leave your device.
Instant: No upload or download wait times.
Secure: Local processing guarantees data safety.
Free: No subscriptions or hidden fees.
How It Works
Understanding the processing logic.
A structure inference engine:
- **Input:** Valid JSON object.
- **Output:** TypeScript Interface / Type alias.
- **Smart:** Detects arrays, optional fields (if multiple objects provided), and basic types.
Accuracy & Reliability
Standard browser-based processing logic.
Who Is This For?
Frontend Devs
Rapidly integrate new API endpoints into a React/Vue app.
Backend Devs
Generate types for API documentation.
Common Mysteries & Fixes
Optional Fields
If your JSON sample doesn't have a field, the interface won't include it. Use comprehensive samples.
Null values
If a value is 'null' in your sample, we type it as 'any' or 'null' because we can't guess the type.
Real-World Scenarios
Quick Processing
Process files without verifying server security.
Offline Work
Use the tool without an internet connection.
Why Choose PrivaQuickTools
FeaturePrivaQuickToolsOthers
Privacy100% LocalCloud Upload
CostFreeFreemium
SpeedInstantSlow Uploads
RegistrationNoneRequired
Privacy & Security Guaranteed
We do not store, view, or upload your files. All processing happens in your browser's memory. When you close the tab, all data is wiped from memory.
Good to Know
Large files depends on your device RAM. Processing massive video/PDFs may be slower on mobile devices.
Benefits
  • Local ProcessingData stays on your machine, always.
  • No InstallationWorks instantly in your browser.
  • Zero Cost100% free and open.
  • UnlimitedNo artificial limits on file count.
When Not To Use
While we aim for perfection, browser-based tools have limits. This tool might not be the best fit for:
  • Extremely large files (e.g., video over 2GB)
  • Batch processing thousands of files at once
  • Workflows requiring server-side collaboration or cloud storage
Frequently Asked Questions
Common questions about this tool.
Yes, it recursively generates interfaces for deep logical structures.
It is as accurate as your input data. Garbage in, garbage out.