JSON to Go Struct Converter

From a JSON sample to a Go struct

Each field comes out exported and carrying a json:"..." struct tag holding the original key. Both halves matter. encoding/json ignores unexported fields entirely, so a lowercase field marshals to nothing at all, and without a tag the package falls back to a case-insensitive match on the field name, which holds until a key contains an underscore or a hyphen.

What to fix after pasting

• Optional fields. A string the server omits decodes to an empty string, which is indistinguishable from an empty string that really was sent. Use *string when absent, null and empty are three different things to your code.
• Output shaping. Add ,omitempty to the tag on fields that should disappear from marshalled output when they hold a zero value.
• Number widths. Integers infer as int64 and decimals as float64. Narrow them when the API documents a range, and use a decimal type or minor units for money rather than float64.
• A JSON null infers as interface{}, which pushes a type assertion into every call site. Replace it with the real type, or a pointer to it.
• Arrays are typed from their first element. For a genuinely mixed array, json.RawMessage is usually a better handle than a slice of interface{}, because it defers the decision to a second pass instead of erasing the type.

The same payload in other statically typed backends: JSON to Rust and JSON to C#.