JSON to Go Struct Converter

Convert your JSON data to Go struct definitions with type inference, json tags, and nested struct support.

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What is a JSON to Go Struct Converter?

Feed in a JSON API response and get back Go struct definitions with PascalCase field names and json tags already wired up for encoding/json.

Go's type system needs explicit struct definitions to marshal and unmarshal JSON, so this converter infers Go types (string, int, float64, bool) from your sample and emits matching tagged fields.

Nested JSON objects become separate struct types and arrays carry their element types, while the whole process runs client-side in your browser.

How to Use Our JSON to Go Converter

Paste your JSON data into the left editor or load a file
The converter automatically generates Go struct definitions in real-time
Nested JSON objects are converted into separate named structs
Each field includes proper json tags for serialization
Copy the generated Go code or download it as a .go file

Examples

REST payload to Go struct with json tags

Paste a response body and get a struct ready to unmarshal withencoding/json. Field names follow Go's exported PascalCase.

Input

{
  "user_id": 101,
  "user_name": "alice",
  "created_at": "2024-05-01T09:00:00Z",
  "is_admin": false
}

Output

type User struct {
    UserID    int    `json:"user_id"`
    UserName  string `json:"user_name"`
    CreatedAt string `json:"created_at"`
    IsAdmin   bool   `json:"is_admin"`
}

Nested order with line items

Array elements produce a named inner struct referenced from the parent as a slice.

Input

{
  "order_id": "A-1001",
  "items": [
    { "sku": "K-01", "qty": 2 }
  ],
  "total": 259.98
}

Output

type Item struct {
    Sku string `json:"sku"`
    Qty int    `json:"qty"`
}

type Order struct {
    OrderID string  `json:"order_id"`
    Items   []Item  `json:"items"`
    Total   float64 `json:"total"`
}

JSON specification reference

Quick reference from RFC 8259. The converter enforces these rules on input; anything outside them is rejected or normalized.

Element	Meaning	Example
Object	Unordered set of key/value pairs	{"a": 1}
Array	Ordered list of values	[1, 2, "x"]
String	Unicode, double-quoted only	"hello"
Number	IEEE 754 double, no NaN / Infinity	3.14
Literal	true / false / null only	null

Common invalid forms

{'a': 1}  // single quotes not allowed
{a: 1}    // unquoted keys
{"a": 1,} // trailing comma
NaN       // not permitted by RFC 8259

Key Features

Type Inference: Automatically maps JSON values to Go types — string, int, float64, bool, slices, and nested structs
JSON Tags: Every field includes proper json struct tags for encoding/json compatibility
PascalCase Fields:Field names are automatically converted to Go's exported PascalCase naming convention
Nested Struct Support: Nested JSON objects generate separate Go struct types with proper references
100% Client-Side: All code generation happens in your browser — your data never leaves your device

Frequently Asked Questions

Q: How are Go struct field names generated from JSON keys?

JSON keys are converted to PascalCase for exported Go fields. For example, "user_name" becomes "UserName" and "firstName" becomes "FirstName". The original JSON key is preserved in the json struct tag for correct serialization.

Q: How are nested JSON objects handled?

Nested JSON objects are automatically converted into separate Go struct types. The parent struct references the nested struct by its PascalCase name, creating a clean and maintainable code structure.

Q: What Go types are supported?

The converter supports string, int, float64, bool, slices ([]Type), and nested structs. Null values are mapped to interface for maximum flexibility.

Q: Can I use the generated structs with encoding/json?

Yes. All generated structs include proper json struct tags, making them fully compatible with Go's encoding/json package for marshaling and unmarshaling JSON data.

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JSON to Go Struct Converter

Convert your JSON data to Go struct definitions with type inference, json tags, and nested struct support.

Loading editors...

Auto Sync

Automatically sync from left

Loading editors...

What is a JSON to Go Struct Converter?

Feed in a JSON API response and get back Go struct definitions with PascalCase field names and json tags already wired up for encoding/json.

Go's type system needs explicit struct definitions to marshal and unmarshal JSON, so this converter infers Go types (string, int, float64, bool) from your sample and emits matching tagged fields.

Nested JSON objects become separate struct types and arrays carry their element types, while the whole process runs client-side in your browser.

How to Use Our JSON to Go Converter

Paste your JSON data into the left editor or load a file
The converter automatically generates Go struct definitions in real-time
Nested JSON objects are converted into separate named structs
Each field includes proper json tags for serialization
Copy the generated Go code or download it as a .go file

Examples

REST payload to Go struct with json tags

Paste a response body and get a struct ready to unmarshal withencoding/json. Field names follow Go's exported PascalCase.

Input

{
  "user_id": 101,
  "user_name": "alice",
  "created_at": "2024-05-01T09:00:00Z",
  "is_admin": false
}

Output

type User struct {
    UserID    int    `json:"user_id"`
    UserName  string `json:"user_name"`
    CreatedAt string `json:"created_at"`
    IsAdmin   bool   `json:"is_admin"`
}

Nested order with line items

Array elements produce a named inner struct referenced from the parent as a slice.

Input

{
  "order_id": "A-1001",
  "items": [
    { "sku": "K-01", "qty": 2 }
  ],
  "total": 259.98
}

Output

type Item struct {
    Sku string `json:"sku"`
    Qty int    `json:"qty"`
}

type Order struct {
    OrderID string  `json:"order_id"`
    Items   []Item  `json:"items"`
    Total   float64 `json:"total"`
}

JSON specification reference

Quick reference from RFC 8259. The converter enforces these rules on input; anything outside them is rejected or normalized.

Element	Meaning	Example
Object	Unordered set of key/value pairs	{"a": 1}
Array	Ordered list of values	[1, 2, "x"]
String	Unicode, double-quoted only	"hello"
Number	IEEE 754 double, no NaN / Infinity	3.14
Literal	true / false / null only	null

Common invalid forms

{'a': 1}  // single quotes not allowed
{a: 1}    // unquoted keys
{"a": 1,} // trailing comma
NaN       // not permitted by RFC 8259

Key Features

Type Inference: Automatically maps JSON values to Go types — string, int, float64, bool, slices, and nested structs
JSON Tags: Every field includes proper json struct tags for encoding/json compatibility
PascalCase Fields:Field names are automatically converted to Go's exported PascalCase naming convention
Nested Struct Support: Nested JSON objects generate separate Go struct types with proper references
100% Client-Side: All code generation happens in your browser — your data never leaves your device

Frequently Asked Questions

Q: How are Go struct field names generated from JSON keys?

Q: How are nested JSON objects handled?

Nested JSON objects are automatically converted into separate Go struct types. The parent struct references the nested struct by its PascalCase name, creating a clean and maintainable code structure.

Q: What Go types are supported?

The converter supports string, int, float64, bool, slices ([]Type), and nested structs. Null values are mapped to interface for maximum flexibility.

Q: Can I use the generated structs with encoding/json?

Yes. All generated structs include proper json struct tags, making them fully compatible with Go's encoding/json package for marshaling and unmarshaling JSON data.