JSON to Go Struct
Convert JSON to Go struct definitions with proper type inference, field naming, and JSON tags.
About JSON to Go Struct Conversion
Go (Golang) is a statically typed language that requires explicit type definitions for JSON deserialization. When consuming REST APIs or reading JSON configuration files, developers must define Go structs that match the JSON structure. Automatically generating Go struct definitions from JSON samples eliminates one of the most tedious and error-prone tasks in Go development -- manually writing struct types with correct json tags for API integration.
Go Struct and JSON Tags Reference
Go uses struct field tags to control JSON serialization. The json:"fieldName" tag maps a struct field to its JSON key. Additional tag options include omitempty (omit the field if its value is zero/empty), - (skip the field entirely), and string (encode numbers as JSON strings). Go struct fields must be exported (capitalized) to be visible to the encoding/json package, which is why the converter generates PascalCase field names.
Type inference follows Go conventions: JSON integers map to int (not int64), floating-point numbers to float64, booleans to bool, and strings to string. Nested JSON objects generate separate struct types, while JSON arrays become slices. Null values are represented as interface (or any in Go 1.18+). For optional fields that may be null in JSON, consider using pointer types (*string, *int) or the sql.NullString pattern. The generated structs are compatible with Go's standard encoding/json package, as well as popular alternatives like json-iterator and easyjson.
Frequently Asked Questions
How are Go struct field names generated?
Field names are converted to PascalCase (exported) and include json tags matching the original JSON key names. Special characters are replaced with underscores.
What types are inferred?
Integers map to int, decimals to float64, booleans to bool, strings to string, arrays to slices, and nested objects to separate struct types. Null values use interface{}.