JSON to Go struct

How to use it

1. Enter json input and root type name.
2. The result appears straight away and updates as you edit.
3. Copy the result, or copy a link that keeps the same values to share it.

How it is calculated

string, int64, float64 and bool for values, []T for arrays and a separate struct per nested object. Fields are PascalCase with Go initialisms such as ID and URL, and each has a json tag with the original key. A null value makes the field a *T pointer, and a key missing from some items gets omitempty.

Example

Inputs: Root type name = Root. Result: Generated code: type Root struct { ID int64 `json:"id"` Name string `json:"name"` Email string `json:"email"` IsActive bool `json:"is_active"` Balance float64 `json:"balance"` Tags []string `json:"tags"` Address Address `json:"address"` Orders []Order `json:"orders"` } type Address struct { City string `json:"city"` PostalCode string `json:"postal_code"` } type Order struct { OrderID string `json:"order_id"` Total float64 `json:"total"` Coupon *string `json:"coupon"` }; Types generated: 3; Fields: 13.

{
  "id": 1024,
  "name": "Sara Ahmed",
  "email": "sara@example.com",
  "is_active": true,
  "balance": 1520.75,
  "tags": ["vip", "riyadh"],
  "address": { "city": "Riyadh", "postal_code": "12211" },
  "orders": [
    { "order_id": "A-1", "total": 99.5, "coupon": "EID10" },
    { "order_id": "A-2", "total": 120, "coupon": null }
  ]
}

type Root struct {
	ID       int64    `json:"id"`
	Name     string   `json:"name"`
	Email    string   `json:"email"`
	IsActive bool     `json:"is_active"`
	Balance  float64  `json:"balance"`
	Tags     []string `json:"tags"`
	Address  Address  `json:"address"`
	Orders   []Order  `json:"orders"`
}

type Address struct {
	City       string `json:"city"`
	PostalCode string `json:"postal_code"`
}

type Order struct {
	OrderID string  `json:"order_id"`
	Total   float64 `json:"total"`
	Coupon  *string `json:"coupon"`
}

Limits and caveats

• A key with mixed types becomes any, which needs Go 1.18 or newer.
• Every whole number becomes int64, even small ones.