JSON to Go Struct Converter
Convert JSON objects to Go struct definitions with proper types, JSON tags, and naming conventions. Automatically handles nested objects, arrays, and nullable fields. Perfect for API integrations, data modeling, and Go development.
Conversion Options
Convert null fields to pointer types
Add omitempty to JSON tags
Platform-independent integers
Order fields A-Z for consistency
Add package line at top
Include explanatory comments
Recommended Settings
Go Struct Best Practices
- •Use PascalCase for exported struct and field names (uppercase first letter)
- •Add JSON struct tags with `json:"fieldName"` for proper marshaling/unmarshaling
- •Use pointer types (*string, *int) for nullable/optional fields to distinguish zero values from nil
- •Add omitempty to JSON tags to exclude zero-value fields from JSON output
- •Use time.Time type for timestamps instead of string for better type safety
Common Use Cases
- •API development: Generate Go structs from API response JSON for type-safe clients
- •Data modeling: Create struct definitions for database models from JSON schemas
- •Configuration: Convert JSON config files to strongly-typed Go structs
- •Testing: Generate mock data structures from example JSON payloads
- •Microservices: Share data models between services using JSON as interchange format
Pro Tips
- •Paste JSON and it auto-validates - conversion happens automatically when valid
- •Nested objects automatically generate separate struct types with proper relationships
- •ISO 8601 timestamps (2024-01-01T00:00:00Z) are detected and converted to time.Time
- •All processing happens in your browser - your data never leaves your device
Most Popular
Most users enable pointers for nulls, omitempty tags, and include package declaration
When to Use This Tool
Generate Go structs from API response JSON to create type-safe HTTP clients. Copy example JSON responses from API documentation or real responses, convert to structs, and use for request/response handling with proper type checking and IDE autocomplete.
Create Go struct models for database tables and ORM frameworks like GORM. Convert JSON schema or example data to structs with appropriate types and tags. Add omitempty for optional fields and use pointers for nullable database columns.
Transform JSON configuration files into strongly-typed Go structs for application settings. Replace untyped map[string]interface{} configs with proper structs that provide compile-time type safety, validation, and better IDE support.
Share data structures between microservices using JSON as the interchange format. Generate matching Go structs across services from common JSON schemas to ensure consistent data types and field names in distributed systems.
How It Works
Paste your JSON data into the input field on the left side
The tool automatically validates JSON syntax to ensure proper formatting
Click 'Convert to Go Struct' or paste valid JSON to trigger automatic conversion
JSON is recursively analyzed to detect types: string, int, float64, bool, arrays, nested objects
ISO 8601 timestamp strings (2024-01-01T00:00:00Z) are automatically detected and converted to time.Time
Nested objects generate separate struct types with PascalCase names derived from JSON keys
Field names are converted to PascalCase for exported fields (e.g., user_id → UserID)
JSON struct tags are generated with proper format: `json:"fieldName,omitempty"`
Pointer types (*Type) are used for nullable fields when 'Use Pointers' option is enabled
Copy the Go code to clipboard or download as .go file ready to use in your project
All processing happens in your browser - your JSON never leaves your device
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Pure JavaScript for optimal performance on modern browsers.
Secure
No data collection, no tracking, no sign-up required.
Frequently Asked Questions
What are Go struct tags and why are they needed?
Struct tags are metadata attached to struct fields using backticks. The `json:"fieldName"` tag tells Go's encoding/json package how to map struct fields to JSON keys during marshaling (struct→JSON) and unmarshaling (JSON→struct). Without tags, Go uses field names directly.
When should I use pointer types for struct fields?
Use pointer types (*string, *int, *bool) for nullable or optional fields. Pointers distinguish between zero values (0, false, "") and missing/null values (nil). This is crucial for APIs where you need to differentiate between 'field not provided' and 'field explicitly set to zero value'.
What does the omitempty tag option do?
Adding omitempty to JSON tags (`json:"field,omitempty"`) tells Go to exclude the field from JSON output if it has a zero value (0, false, "", nil, empty slice/map). This reduces JSON payload size and makes API responses cleaner by omitting unset optional fields.
How are nested JSON objects handled?
Nested objects automatically generate separate struct types. For example, {"user": {"name": "Alice"}} creates both a User struct and a main Data struct with a User field. The tool derives struct names from JSON keys using PascalCase naming.
Why use int64 instead of int?
The int type size is platform-dependent (32-bit or 64-bit). Using int64 explicitly ensures consistent behavior across all platforms and prevents overflow issues. This is especially important for IDs, timestamps, and large numbers in distributed systems.
How are timestamps detected and converted?
The tool automatically detects ISO 8601 timestamp strings (e.g., "2024-01-01T00:00:00Z") and converts them to Go's time.Time type. This provides type-safe date/time handling and enables proper time operations. The tool also adds 'import "time"' when needed.
Can I customize the generated struct and package names?
Yes! Use the 'Package Name' field to specify your package (e.g., "models", "types", "api") and 'Struct Name' field for the root struct name (e.g., "User", "Response", "Config"). These names are used in the generated Go code.
Is my JSON data secure using this tool?
Your data is completely private - all conversion happens entirely in your browser using JavaScript. Nothing is sent to any server. The tool processes JSON locally and generates Go code client-side. However, remember not to commit sensitive data in your source code.