JSON to Go Struct Converter

What is JSON → Go?

Converting JSON to Go structs generates the typed structs you need to marshal and unmarshal JSON with encoding/json. Every JSON key becomes an exported (PascalCase) Go field with a matching struct tag, so round-tripping preserves the original key names. Nested objects generate nested struct types, and arrays are typed as slices of the inferred element type.

How to convert JSON to a Go struct

1. 1Paste your JSON sample into the input pane.
2. 2The tool infers Go types (string, int, float64, bool, slices, nested structs) and adds json tags.
3. 3Copy the generated struct into your package and rename the top-level type to match your domain.
4. 4Use json.Unmarshal to decode responses into the struct, or json.Marshal to encode.

Use Cases

Code Examples

{ "user_id": 7, "name": "Ada", "tags": ["a", "b"] }

type Root struct {
	UserID int      `json:"user_id"`
	Name   string   `json:"name"`
	Tags   []string `json:"tags"`
}

var r Root
if err := json.Unmarshal(data, &r); err != nil {
	log.Fatal(err)
}

Key Concepts

Struct tags

The `json:"..."` tag maps a Go field to a JSON key. Without it, Go would expect the JSON key to match the exported field name exactly (case-insensitively).

Exported fields

Only fields starting with an uppercase letter are visible to encoding/json. Lowercase fields are ignored during marshal/unmarshal.

omitempty

Adding `,omitempty` to a tag omits the field from output when it holds a zero value — useful for optional fields.

json.Number

By default numbers decode to float64. Use json.Number or a typed field to avoid precision loss on large integers.

Tips & Best Practices

• ▸Numbers in JSON are ambiguous — the tool guesses int vs float64 from the sample. Adjust manually if a field can be fractional.
• ▸Add `,omitempty` to optional fields so encoded output stays clean.
• ▸For deeply dynamic JSON, consider json.RawMessage to defer decoding of a sub-tree.
• ▸Field order in the struct doesn't affect correctness, but grouping related fields improves readability.