In this post I'll show you how to customize quicktype's output.

Suppose we're building a mobile game in C# that the player can pick up on their Android phone and continue on iOS. We need to save game state to JSON.

Basic Generation

Given our game state JSON:

{
  "player_name": "Hero123",
  "level": 42,
  "xp": 15000,
  "inventory": ["sword", "shield", "potion"],
  "position": { "x": 100.5, "y": 200.3 }
}

Basic quicktype command:

quicktype game-state.json -l csharp -o GameState.cs

Customization Options

Namespace

quicktype game-state.json -l csharp \
  --namespace MyGame.Models \
  -o GameState.cs

Property Attributes

quicktype game-state.json -l csharp \
  --features attributes-only \
  -o GameState.cs

This generates POCOs with JsonProperty attributes but without helper methods.

Array Type

Use List instead of arrays:

quicktype game-state.json -l csharp \
  --array-type list \
  -o GameState.cs

Access Modifiers

quicktype game-state.json -l csharp \
  --access-modifiers internal \
  -o GameState.cs

Language-Specific Options

Each language has unique options. View them with:

quicktype --lang csharp --help

Common options include:

• Swift: --struct-or-class, --access-level
• TypeScript: --just-types, --runtime-typecheck
• Java: --package, --lombok
• Go: --package, --just-types-and-package

Configuration Files

Save your options in a quicktype.json config file:

{
  "lang": "csharp",
  "namespace": "MyGame.Models",
  "features": "complete",
  "array-type": "list"
}

Then run:

quicktype --config quicktype.json game-state.json -o GameState.cs