JSON to Go Struct

An API response landed on your desk and now you need the matching Go struct. Typing it by hand is tedious and treacherous: one typo in a json: tag and encoding/json says nothing at all, it just hands back the field's zero value, and you spend the afternoon wondering why created_at is empty. Paste the JSON, name the root type, and the struct comes out ready to drop into the file.

Every key becomes a PascalCase field, because Go only serializes exported fields, the ones starting with a capital, and the json: tag keeps the original name. Types are inferred from the sample values: whole numbers become int, decimals become float64, null becomes interface{}. That is where the trap sits. JSON does not separate integers from decimals, so a price that arrived as 10.0 is read as int and breaks on the first response carrying 10.5.

For arrays, leave a single representative element before pasting. With two or more objects in the same list the generator emits one struct per element (Post, Post2) and the field falls back to []interface{}. Keys that clash with a Go keyword or start with a digit pick up an underscore, becoming _Type or _2fa, and an underscore-initial field is unexported, so rename it before you compile. Everything runs in the browser.