TypeScript to JSON Converter
Convert TypeScript interfaces, types, and enums into realistic mock JSON data and sample payloads in your browser.
At a glance
TypeScript to JSON Converter parses TypeScript interfaces, type aliases, and enums into mock or default JSON objects. It semantically infers realistic values from field names, handles nested types, generates typed arrays, resolves unions, and exports clean JSON fixtures client-side without any server dependencies.
100% Client-Side TypeScript to Mock JSON Generator
Smart Semantic MockingParse TypeScript interfaces, type aliases, and enums into realistic mock JSON data. Context-aware value synthesis for IDs, emails, names, dates, prices, and arrays in browser memory.
The engine analyzes property names to generate contextual values: email addresses for *email*, ISO timestamps for *date* or *at*, names for *name*, and realistic currencies for *price* or *amount*.
Supports multi-interface models, inheritance via extends, TypeScript enum members, and string literal unions ("pending" | "approved"). Generates complete structured payloads automatically.
Proprietary TypeScript interfaces, domain schemas, and API contracts are parsed entirely within your browser's local JavaScript engine. Zero network calls and zero telemetry.
Why Use This TypeScript to JSON Converter?
How to Use TypeScript to JSON Converter
Paste TypeScript Interface
Enter or paste your TypeScript interfaces, types, and enums into the input editor.
Select Mocking Mode & Options
Choose between realistic mock data or minimal defaults, toggle optional fields, and select record count.
Copy or Download Mock JSON
Copy the generated JSON payload directly to your clipboard or download it as a .json fixture file.
TypeScript Interface to Mock JSON Data
Demonstrates parsing a TypeScript User interface and producing a realistic JSON mock fixture with contextually inferred values.
interface User {
id: string;
name: string;
email: string;
isActive: boolean;
createdAt: string;
tags: string[];
}
{
"id": "usr_01h2x",
"name": "Jane Doe",
"email": "user@example.com",
"isActive": true,
"createdAt": "2026-10-17T10:00:00.000Z",
"tags": [
"sample_tag"
]
}
Technical Specifications & Engine Details
| Specification | Details |
|---|---|
| Supported Formats | TYPESCRIPT, TS, TEXT → JSON |
| Execution Mode | 100% Client-Side In-Browser (client) |
| Browser Requirements | Modern web browser with JavaScript enabled. |
| Performance Constraints | Zero external dependencies. Runs 100% client-side in browser memory. |
100% Client-Side Privacy Guarantee
Your files and data remain strictly on your local device. Computations run locally using browser memory with zero network uploads.
Frequently Asked Questions
How does semantic mock generation work?
Can this tool handle multiple related interfaces?
How are TypeScript string literal unions handled?
Are my TypeScript types or code uploaded to any server?
Methodology
This tool runs entirely in your browser. The example above shows a representative input and the result it produces.
Last updated .