JSON to Go Struct Generator

Why generate Go structs from JSON?

Go's encoding/json package needs struct fields and tags to map JSON keys to typed values. When integrating a new API, copying field names from documentation often misses optional fields or wrong types. Generating from a real response captures the shape you actually receive.

What gets inferred

Objects become structs with exported (capitalized) field names. Whole numbers map to int and decimals to float64. Arrays become slices, and mixed-type arrays fall back to []interface{}. Nested objects become nested struct types with generated names, so a deeply nested API response produces a complete set of Go types in one pass.

• Objects to structs with exported fields
• json:"..." tags matching the original keys
• int / float64 / bool / string from JSON scalars
• Slices for arrays, interface{} for mixed types

Unmarshaling API responses

The generated structs plug straight into encoding/json: pass a pointer to json.Unmarshal along with the response body and Go fills in the fields by matching tags. Generating from a real payload — rather than hand-typing from docs — means you capture optional fields and actual types instead of guessing.

Review before shipping

Generated structs are a fast starting point, not a final contract. Numbers that are sometimes whole and sometimes decimal should be widened to float64; timestamps often deserve time.Time with a custom format; and nullable fields may need pointers or omitempty. Treat the output as a scaffold you refine.