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JSON to Go / Python / Rust

Generate Go structs, Python dataclasses, and Rust serde structs from a JSON sample, with nested types.

JSON tags

5 types
type Geo struct {
	Lat float64 `json:"lat"`
	Lng float64 `json:"lng"`
}

type Address struct {
	Street string `json:"street"`
	City string `json:"city"`
	Zip string `json:"zip"`
	Geo Geo `json:"geo"`
}

type Item struct {
	SKU string `json:"sku"`
	Qty int64 `json:"qty"`
	Price float64 `json:"price"`
}

type Order struct {
	OrderID string `json:"orderId"`
	Total float64 `json:"total"`
	Shipped bool `json:"shipped"`
	Coupon interface{} `json:"coupon,omitempty"`
	Items []Item `json:"items"`
	Note string `json:"note,omitempty"`
}

type Root struct {
	ID int64 `json:"id"`
	Username string `json:"username"`
	Email string `json:"email"`
	IsActive bool `json:"isActive"`
	Balance float64 `json:"balance"`
	Address Address `json:"address"`
	Roles []string `json:"roles"`
	Orders []Order `json:"orders"`
}
  • Nested objects become named types.
  • Identical shapes are merged & reused.
  • null & missing keys become optional / pointer.
  • Mixed arrays fall back to interface{} / Any / Value.