JSON Input
Go Struct Output
Go struct definition will appear here...
Convert JSON to Go Struct Definitions
Converting JSON data to Go struct definitions is essential for building type-safe Go applications. This tool automatically generates Go types from JSON input, handling nested objects, arrays, and various data types. Each field is given proper naming conventions (PascalCase), correct Go types, and optional json struct tags for serialization. The converter intelligently detects numeric precision (int32 vs int64), handles null values, and creates separate struct types for nested objects.
Key Features
- Automatic type detection — maps JSON types to appropriate Go types (string, int64, float64, bool, interface{})
- Customizable struct names — set the root struct name, auto-generate names for nested types
- JSON tags support — optionally add json tags with field names and omitempty
- 100% client-side processing — all conversion happens in your browser, no data sent to servers
How to Use
- Enter or paste your JSON data in the left input field
- Set the root struct name (e.g., 'User', 'Response', 'AutoGenerated')
- Choose options: add JSON tags, omitempty, inline structs
- Click 'Convert to Go Struct' to generate the Go code
- Copy the output and paste it into your Go project
Common Use Cases
- Generating type definitions from REST API documentation
- Creating models for JSON configuration files
- Building request/response types for Go HTTP services
- Quickly prototyping data models from sample JSON
- Converting database query results to typed structures
Frequently Asked Questions
What is a Go struct?
A struct in Go is a composite data type that groups variables together. Unlike maps, structs provide type safety — each field has a specific name and type. They're essential for unmarshaling JSON data.
What does 'PascalCase' field naming mean?
PascalCase (CapitalizedWords) is the Go convention for exported struct fields. The tool converts snake_case and kebab-case to PascalCase automatically for idiomatic Go code.
What are JSON struct tags used for?
JSON struct tags (e.g., `json:"field_name"`) tell Go's encoding/json package how to map between JSON keys and struct fields. Without them, field names must match exactly.
When should I use omitempty?
Use omitempty for optional fields. It tells Go to omit the field from JSON output if it has a zero value (nil, empty string, 0, false), making your JSON more compact.
How are nested objects handled?
Nested JSON objects become separate Go struct types with descriptive names. For example, a 'user' object inside 'profile' becomes struct type 'User', referenced in the parent struct.
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☕Buy Me a CoffeeHow to Use
- Enter or paste your JSON data in the left input field
- Set the root struct name (e.g., 'User', 'Response', 'AutoGenerated')
- Choose options: add JSON tags, omitempty, inline structs
- Click 'Convert to Go Struct' to generate the Go code
- Copy the output and paste it into your Go project
Common Use Cases
- Generating type definitions from REST API documentation
- Creating models for JSON configuration files
- Building request/response types for Go HTTP services
- Quickly prototyping data models from sample JSON
- Converting database query results to typed structures