Quicktype - JSON to Type Generator

Generate strongly-typed interfaces from JSON files or URLs.

When to Use

• User asks to generate types from JSON

• User wants TypeScript interfaces for API responses

• User needs type definitions for config files

• User mentions "quicktype" or "json to types"

Instructions

Parse the input to identify:

• File path or URL

• Target language (default: TypeScript)

• Output file (optional)

Run the quicktype script:

python3 ~/.claude/skills/quicktype/scripts/quicktype.py <file> [--lang LANG] [--out FILE]

Display the generated types in a fenced code block

If --out specified, save to that file

Supported Languages

Flag Language

ts

TypeScript

go

Go structs

py

Python dataclass

rs

Rust structs

swift

Swift Codable

kotlin

Kotlin data class

Examples

Input: /quicktype api/users.json

Output: TypeScript interfaces for the JSON structure

Input: /quicktype config.json --lang go

Output: Go struct definitions

Input: /quicktype response.json --out src/types/api.ts

Output: Types saved to specified file