Generate Go struct definitions from JSON data with proper field naming and JSON tags.
This generator turns a pasted JSON value into Go type declarations for the objects, arrays, strings, numbers, booleans, and nulls observed in that value. Object keys become exported Go field names, while JSON tags preserve the original member names used when encoding or decoding. The result is a starting point for a request, response, event, or configuration model, not a complete schema. The usual surprise is that one payload cannot establish whether a field is optional, nullable, polymorphic, or simply absent from that particular example.
The generator interprets the pasted JSON as an observed value tree. Object members become fields, arrays become slice-shaped data, and scalar values suggest candidate Go types. Nested objects must be represented by additional struct shapes. Each field pairs an exported Go identifier with a JSON tag carrying the member's original spelling, so wire names and Go names can differ.
Go's encoding/json package reads and writes exported struct fields. A tag such as json:"user_id" associates the JSON member user_id with a Go field whose identifier can follow Go naming rules. The generated declaration records this mapping, but it cannot add business semantics such as requiredness, ranges, defaults, or relationships that were not present in the pasted value.
A Go struct field used by encoding/json must be exported, so its identifier begins with an uppercase letter and must follow Go identifier rules. JSON member names have no equivalent restriction. The json tag preserves the exact wire name, allowing a field with an idiomatic Go name to read or write a key such as user_id or display-name.
No. A struct provides destinations for decoding, but the sample alone does not define required fields, nullability, numeric limits, string formats, or cross-field rules. Missing fields generally leave ordinary Go fields at their zero values, which can be indistinguishable from explicitly supplied zero values. Choose pointers, custom types, and validation separately when that distinction matters.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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