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JSON to Go Struct
Generate Go struct definitions from JSON data — with json tags and proper field types
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- JSON to Go Struct
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Generated Go Code
type User struct {
ID int `json:"id"`
Name string `json:"name"`
Email string `json:"email"`
}Structs
0
Fields
0
Tags
-
Nesting
0
What Are Go Structs?
Structs are Go's way of defining typed collections of fields. They're the foundation for data models, API request/response types, and configuration structures. With struct tags, you control JSON, BSON, and YAML serialization behavior.
How to Use
- Paste JSON — Enter valid JSON data.
- Set struct name & tag style — Choose json, bson, yaml tags or all.
- Toggle options — omitempty, pointer types for nullable fields.
- Copy or download — Save as
.gofile.
Frequently Asked Questions
What Go versions are compatible with the generated structs?
The generated Go code uses standard struct syntax compatible with Go 1.0 and later. The struct tags follow the standard encoding/json package conventions, which are available in all Go versions.
What is the purpose of struct tags in Go?
Struct tags are metadata annotations attached to struct fields that control serialization behavior. The json:"field_name" tag tells the encoding/json package how to map JSON keys to struct fields, including options like omitempty to skip zero-value fields during serialization.
Should I use pointer types for nullable fields?
Use pointer types when a JSON field can be null or absent. Pointer types (*string, *int) distinguish between a field being absent (nil) and having a zero value ("", 0). Non-pointer types cannot represent null values.
How are embedded/nested structs handled?
Nested JSON objects are generated as separate named structs. The tool creates a new struct type for each nested object and references it as a field type in the parent struct. This maintains Go's idiomatic composition approach.
Can I use multiple tag styles simultaneously?
Yes. The tag style options include json+bson, json+yaml, and all three combined. This is useful when your struct needs to be serialized to multiple formats — for example, when storing in MongoDB (bson) while also serving via a REST API (json).
Last updated: 9 Jul 2026
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