Add omitempty tag Inline nested structs Use pointers for optional Include package declaration

Struct name:

Drop JSON file here

Features

🐹 Idiomatic Go Code

PascalCase struct and field names
Proper json struct tags
Correct Go type inference
Nested struct generation

⚡ Smart Type Detection

int64 vs float64 detection
Nested object handling
Array type inference
time.Time for dates (optional)

🎯 Production Ready

omitempty for optional fields
Pointer types support
Package declaration
Ready for json.Unmarshal

Go Struct Guide

Go JSON Struct Tags

Go uses struct tags to control JSON serialization. The json tag specifies the JSON field name, and omitempty excludes zero-value fields from the output.

type User struct {
    ID    int64  `json:"id"`
    Name  string `json:"name"`
    Email string `json:"email,omitempty"`
}

Using Generated Structs

package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    jsonData := `{"id": 1, "name": "John"}`

    var user User
    err := json.Unmarshal([]byte(jsonData), &user)
    if err != nil {
        panic(err)
    }

    fmt.Printf("User: %+v\n", user)
}

Common Use Cases

API Clients: Parse JSON responses from REST APIs
Web Services: Define request/response bodies for Gin, Echo, Fiber
Config Files: Load JSON configuration into Go structs
Data Processing: Parse JSON logs or data exports
gRPC/Protobuf: Start with JSON, convert to Go, then to proto

FAQ

Q: When should I use omitempty?

A: Use omitempty when you want to exclude zero-value fields (empty strings, 0, false, nil) from JSON output. This is useful for PATCH requests or optional fields.

Q: Why use pointers for optional fields?

A: Pointers allow distinguishing between "field not present" (nil) and "field present with zero value". Important for optional integers or booleans.

Tips for production-ready Go structs

Go's encoding/json package is strict about exported fields and types, so a few small edits to generated structs make decoding far more robust once real traffic arrives.

Tips and common pitfalls

Only exported (capitalized) fields are decoded. The json struct tag maps them back to the original lowercase key.
Numbers that can exceed 2⁵³, such as some IDs, are safer as string with the ,string tag option or as json.Number.
Use time.Time for RFC 3339 timestamps; it decodes them directly without extra code.
Call decoder.DisallowUnknownFields() in tests to catch fields your struct does not know about yet.

JSON to Go Struct