Working with JSON APIs in Go requires defining struct types that match JSON structure. Manually writing these structs is tedious and error-prone. Analyzes JSON data, infers Go types, and generates struct definitions with proper json tags ready to paste into code.
Go struct output will appear here...Paste a JSON object or array into the input field. The tool analyzes the structure and generates corresponding Go struct definitions with exported field names and json tags. You can customize the root struct name, choose between inline nested structs or separate type definitions, toggle omitempty tags for optional fields, and select whether to use pointer types for nullable fields. The output includes all nested structs, properly ordered so they compile without forward reference issues.
JSON-to-Go conversion is essential when building Go API clients that consume JSON REST endpoints, creating Go backend services that receive JSON request bodies, migrating applications from dynamically typed languages to Go, prototyping Go data models from example API responses, generating Go types from JSON Schema or OpenAPI specification examples, and bootstrapping Go microservices that interoperate with JSON-based systems like Elasticsearch, MongoDB, or third-party APIs.
The generator infers Go types from JSON values: strings map to string, numbers to int64 or float64 (based on whether they contain a decimal point), booleans to bool, null to interface{} or pointer types, objects to nested structs, and arrays to slices. Field names are converted from JSON's snake_case or camelCase to Go's PascalCase convention using smart capitalization rules (e.g., 'user_id' becomes 'UserID', 'url' becomes 'URL'). When multiple objects in an array have different fields, the generator creates a merged struct with all observed fields marked as omitempty.
The tool examines each JSON value to determine its Go type. Strings become string, whole numbers become int64, decimal numbers become float64, booleans become bool, nested objects become named structs, and arrays become slices. Null values default to pointer types or interface{}.
JSON tags (e.g., `json:"user_name,omitempty"`) tell Go's encoding/json package how to map struct fields to JSON keys. The tag specifies the JSON key name and optional directives like omitempty (omit field if zero value) and '-' (ignore field entirely).
Yes. The tool recursively processes nested JSON objects and creates separate named struct types for each level of nesting. This produces clean, idiomatic Go code where each struct is defined independently and referenced by name in parent structs.
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