About JSON to Go Struct

Generates Go structs from a JSON sample, entirely in your browser. Nested objects become their own named structs, arrays of objects merge into a single struct, numbers are typed as int or float64 by value, booleans as bool, and null or mixed values as interface{}. Keys that appear in only some elements of an object array become pointer fields with a ,omitempty json tag — the idiomatic Go way to model optional fields. Every field gets an exported name and a json tag preserving the original key, with the output column-aligned like gofmt.

• Nested objects become separate named structs referenced by field type
• Arrays of objects are merged; keys missing from some elements become *T with json:"key,omitempty"
• Numbers infer to int (whole) or float64 (decimal); booleans to bool
• null and mixed arrays become interface{} / []interface{}
• Exported (capitalized) field names with json tags preserving the original key
• Output is column-aligned (gofmt-style); runs fully client-side

Frequently Asked Questions

Why are some fields pointers with omitempty?

When a key appears in only some elements of an array of objects, it is optional. In Go the idiomatic way to represent “may be absent” is a pointer (*T) plus json:"key,omitempty", so the field can be nil and is omitted when empty on marshal.

How are numbers typed?

By the sample value: whole numbers become int, numbers with a decimal become float64. JSON has a single number type, so if a field is sometimes whole and sometimes decimal in your data, prefer float64 and adjust the generated type.

Is the output ready to compile?

Yes — it is valid Go with exported field names, json tags, and gofmt-style alignment. Paste it into a .go file; rename the root struct to taste.