JSON to Code Generator: 10x Your API Integration Speed

The Problem

Every API integration starts the same way: you get a JSON response, then manually type out struct definitions, interfaces, or classes. This is repetitive, boring, and error-prone.

The Solution

A JSON to code generator eliminates the manual work. Paste the JSON once, get production-ready code in seconds.

Real Example: Weather API

Imagine you're integrating a weather API that returns this JSON:

{
  "location": {
    "name": "Beijing",
    "country": "China",
    "lat": 39.9042,
    "lon": 116.4074
  },
  "current": {
    "temp_c": 22.5,
    "condition": {
      "text": "Partly cloudy",
      "icon": "//cdn.weatherapi.com/weather/64x64/day/116.png",
      "code": 1003
    },
    "wind_kph": 15.3,
    "wind_dir": "NNE",
    "humidity": 58,
    "feelslike_c": 21.8,
    "uv": 5.6
  },
  "forecast": [
    {
      "date": "2026-06-18",
      "day": {
        "maxtemp_c": 28.4,
        "mintemp_c": 18.2,
        "condition": {
          "text": "Sunny",
          "icon": "//cdn.weatherapi.com/weather/64x64/day/113.png",
          "code": 1000
        }
      }
    }
  ]
}

Using the JSON to Code Generator on YZIF, here's what you get:

Go Structs

type WeatherResponse struct {
  Location struct {
    Name    string  `json:"name"`
    Country string  `json:"country"`
    Lat     float64 `json:"lat"`
    Lon     float64 `json:"lon"`
  } `json:"location"`
  Current struct {
    TempC     float64 `json:"temp_c"`
    Condition struct {
      Text string `json:"text"`
      Icon string `json:"icon"`
      Code int    `json:"code"`
    } `json:"condition"`
    WindKph    float64 `json:"wind_kph"`
    WindDir    string  `json:"wind_dir"`
    Humidity   int     `json:"humidity"`
    FeelslikeC float64 `json:"feelslike_c"`
    Uv         float64 `json:"uv"`
  } `json:"current"`
  Forecast []struct {
    Date string `json:"date"`
    Day  struct {
      MaxtempC float64 `json:"maxtemp_c"`
      MintempC float64 `json:"mintemp_c"`
      Condition struct {
        Text string `json:"text"`
        Icon string `json:"icon"`
        Code int    `json:"code"`
      } `json:"condition"`
    } `json:"day"`
  } `json:"forecast"`
}

TypeScript Interfaces

interface WeatherResponse {
  location: {
    name: string;
    country: string;
    lat: number;
    lon: number;
  };
  current: {
    temp_c: number;
    condition: {
      text: string;
      icon: string;
      code: number;
    };
    wind_kph: number;
    wind_dir: string;
    humidity: number;
    feelslike_c: number;
    uv: number;
  };
  forecast: Array<{
    date: string;
    day: {
      maxtemp_c: number;
      mintemp_c: number;
      condition: {
        text: string;
        icon: string;
        code: number;
      };
    };
  }>;
}

Rust Structs with Serde

#[derive(Debug, Serialize, Deserialize)]
struct WeatherResponse {
    #[serde(rename = "location")]
    location: Location,
    #[serde(rename = "current")]
    current: Current,
    #[serde(rename = "forecast")]
    forecast: Vec,
}

#[derive(Debug, Serialize, Deserialize)]
struct Location {
    #[serde(rename = "name")]
    name: String,
    #[serde(rename = "country")]
    country: String,
    #[serde(rename = "lat")]
    lat: f64,
    #[serde(rename = "lon")]
    lon: f64,
}
#[derive(Debug, Serialize, Deserialize)]
struct Current {
    #[serde(rename = "temp_c")]
    temp_c: f64,
    #[serde(rename = "condition")]
    condition: Condition,
    #[serde(rename = "wind_kph")]
    wind_kph: f64,
    #[serde(rename = "wind_dir")]
    wind_dir: String,
    #[serde(rename = "humidity")]
    humidity: i64,
    #[serde(rename = "feelslike_c")]
    feelslike_c: f64,
    #[serde(rename = "uv")]
    uv: f64,
}

Productivity Gains

Task	Manual	With Generator
Typing structs (Go)	5-10 min	5 seconds
Interfaces (TS)	3-5 min	5 seconds
Serde derives (Rust)	5-8 min	5 seconds
POJO classes (Java)	5-10 min	5 seconds
Cross-language types	20+ min	10 seconds

Best Practices

1. **Clean the JSON first** — Remove unnecessary fields before generating to keep types minimal 2. **Handle optional fields** — Note which fields might be null and adjust types accordingly 3. **Validate generated code** — Always run the compiler after generating; nested struct naming may need manual adjustment 4. **Use for documentation** — Generate interfaces for your API consumers as part of your SDK docs

Try It Now

Use the JSON to Code Generator on YZIF. Paste any JSON and instantly get Go, TypeScript, Rust, or Java code.