JSON to Go Struct: Essential Tool for API Developers

Why Convert JSON to Go Structs?

When building Go applications that consume REST APIs, you need struct definitions to deserialize JSON responses. Manually transcribing nested JSON into Go structs is tedious, error-prone, and a waste of valuable development time.

Real Example: GitHub API User Response

Here's the JSON returned by the GitHub API for a user profile:

{
  "login": "octocat",
  "id": 1,
  "avatar_url": "https://github.com/images/error/octocat_happy.gif",
  "gravatar_id": "",
  "url": "https://api.github.com/users/octocat",
  "html_url": "https://github.com/octocat",
  "followers_url": "https://api.github.com/users/octocat/followers",
  "created_at": "2011-01-25T18:44:36Z",
  "updated_at": "2024-03-20T10:00:00Z",
  "plan": {
    "name": "Free",
    "space": 976562499,
    "private_repos": 10000,
    "collaborators": 0
  }
}

Manually writing the Go structs would look like this:

type User struct {
  Login        string    `json:"login"`
  ID           int       `json:"id"`
  AvatarURL    string    `json:"avatar_url"`
  GravatarID   string    `json:"gravatar_id"`
  URL          string    `json:"url"`
  HTMLURL      string    `json:"html_url"`
  FollowersURL string    `json:"followers_url"`
  CreatedAt    time.Time `json:"created_at"`
  UpdatedAt    time.Time `json:"updated_at"`
  Plan         Plan      `json:"plan"`
}

type Plan struct {
  Name          string `json:"name"`
  Space         int64  `json:"space"`
  PrivateRepos  int    `json:"private_repos"`
  Collaborators int    `json:"collaborators"`
}

Why Use the YZIF JSON to Go Tool?

Using the JSON to Go tool on YZIF, you can:

1. **Paste the raw JSON** — no need to clean or reformat 2. **Get instant structs** — with proper json tags, CamelCase field names, and type inference 3. **Handle nesting** — nested objects become nested structs automatically 4. **Array support** — JSON arrays become slices with the correct element type 5. **Correct types** — strings, numbers, booleans, arrays, objects, and time fields are inferred

Before vs After

**Before:** 10 minutes of manual typing, likely with typos or wrong types
**After:** 10 seconds with the YZIF JSON to Go tool

The tool also handles edge cases like nullable fields, empty arrays, and deeply nested structures. It converts snake_case JSON keys to idiomatic CamelCase Go field names and generates proper json struct tags automatically.

Pro Tips for Go Structs

- Use `json:"fieldname,omitempty"` to skip zero-value fields in JSON output
- For nullable fields, use pointer types (`*string`) or `sql.NullString`
- Always run `go vet` on generated code to catch any issues
- Combine multiple API responses into a single paste to generate all structs at once

Try It Now

Visit the JSON to Go Struct Generator on YZIF and paste any JSON API response to get production-ready Go structs in seconds.