About Convert JSON to Go
Paste JSON and get Go struct definitions with proper json field tags. Handles nested objects, slices, and mixed types. Supports schema merging across all array items.
Frequently Asked Questions
What is JSON to Go struct generation?
JSON to Go struct generation analyses a JSON sample and produces Go struct definitions with json:"..." field tags. The result can be used directly with encoding/json to unmarshal the same JSON at runtime, giving your Go program fully typed access to the data.
How do I add json struct tags for camelCase JSON field names in Go?
The generator adds json:"fieldName" tags automatically using the original JSON key. For example, "firstName" in JSON becomes FirstName string `json:"firstName"` in the struct. The exported Go field name follows PascalCase convention while the tag preserves the original casing for encoding/json to use during marshal and unmarshal.
When should I use pointer types vs value types in Go struct fields?
Use pointer types (*string, *int) for optional JSON fields that may be null or absent — a nil pointer distinguishes "missing" from zero-value. Use value types (string, int) for required fields that are always present. The generator uses value types by default; add * manually to fields that can be null.
How does omitempty work with Go JSON struct tags?
Adding ,omitempty to a tag (e.g. json:"email,omitempty") causes the field to be omitted from marshalled JSON when the value is the zero value (empty string, 0, false, nil). It does not affect unmarshalling. Use omitempty for optional output fields to keep marshalled JSON compact.
Can I unmarshal JSON into a Go struct without defining all fields?
Yes. encoding/json silently ignores JSON keys that have no matching struct field. Only define the fields you need. Alternatively, embed a json.RawMessage field to capture unknown keys, or use a map[string]interface{} for fully dynamic JSON. For unknown-key detection, use json.Decoder with DisallowUnknownFields().
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