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CalcForge

JSON to Go Converter

Generate Go structs with JSON tags from sample payloads—no manual field typing.

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Go structs from JSON samples

Go services unmarshaling JSON need struct tags aligned with API field names. CalcForge reads your sample document and writes struct definitions with `json` tags and nested types so you can paste into handlers, workers, or config loaders.

Good fits

  • Scaffolding structs for new microservice endpoints
  • Modeling webhook payloads in Go workers
  • Creating config structs from example JSON files
  • Prototyping before investing in full OpenAPI codegen
JSON:
{"id":1,"meta":{"env":"prod"}}

Go:
type Root struct {
    ID   int  `json:"id"`
    Meta Meta `json:"meta"`
}
type Meta struct {
    Env string `json:"env"`
}

Practical notes

  • Exported type names may need PascalCase tweaks to match your package conventions.
  • Use pointers or `omitempty` tags manually for optional API fields.
  • Validate with `encoding/json` Unmarshal on real payloads after codegen.

Frequently asked questions

Are json struct tags included?

Yes. Field tags mirror JSON keys so `encoding/json` maps correctly on unmarshal.

How are numbers typed?

Integers and floats infer from sample values. Large IDs may need `json.Number` or string types—adjust manually.

Can nested arrays generate slice types?

Repeated object shapes become slices of struct types; primitive arrays become `[]string`, `[]int`, etc.

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