📖 What is JSON to Go Struct?
JSON to Go generates Go struct definitions from a JSON sample. Paste any JSON and get properly typed Go structs with json struct tags for marshaling and unmarshaling. Field names are automatically converted to PascalCase following Go conventions. Use it when building Go APIs, consuming external REST services, or parsing JSON config files. Everything runs in your browser.
💡 Example
Input
{"user_name":"Alice","age":30,"is_active":true}
Output
type Root struct {
UserName string `json:"user_name"`
Age int `json:"age"`
IsActive bool `json:"is_active"`
}
🛠️ Common Use Cases
- Generating Go structs from REST API response samples
- Building request/response types for Go HTTP handlers
- Creating config structs for JSON configuration files
- Scaffolding database models from JSON data
- Converting API docs into Go type definitions
📝 Go Naming Conventions
- Exported (public) fields start with uppercase:
UserName - JSON tags preserve the original key:
`json:"user_name"` - Acronyms stay uppercase:
ID, URL, HTTP - Use
omitempty tag for optional fields: `json:"name,omitempty"`
⚠️ Common Mistakes
- Missing json tags — without tags, Go uses exact field name matching which fails on snake_case JSON
- Using interface{} everywhere — specify concrete types when possible for type safety
- Number precision — Go uses float64 for JSON numbers by default. Use json.Number or int64 for precise large integers.
❓ Frequently Asked Questions
Does it add json struct tags? ▾
Yes — every field includes a json:"original_key" tag so marshaling and unmarshaling work correctly with the original JSON key names.
How does it handle nested objects? ▾
Nested JSON objects generate separate named struct types that are referenced as fields in the parent struct.
What about optional/nullable fields? ▾
Fields that could be null should use pointer types like *string or *int. You may need to adjust the generated output for nullable fields.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.