JSON to Go Struct
Convert JSON to Go struct definitions instantly. Paste JSON and get clean Go code with proper types, json tags, and omitempty support.
How does JSON to Go struct conversion work?
The tool parses your JSON input and automatically generates Go struct definitions. It maps JSON value types to corresponding Go types, converts keys to PascalCase field names, and optionally adds json tags for serialization. Nested objects become separate named structs.
What Go types are generated for JSON values?
Strings map to string, integers to int64, floating-point numbers to float64, booleans to bool, null to interface{}, arrays to []Type, and objects to nested structs. You can choose between int64 and float64 for all numbers.
What are json tags in Go structs?
Json tags like `json:"fieldName"` tell Go's encoding/json package how to map struct fields to JSON keys during marshaling and unmarshaling. The omitempty option skips fields with zero values in the output.
What does "pointers for optional" mean?
When enabled, nullable fields use pointer types like *string instead of string. This lets you distinguish between zero values (empty string, 0) and missing or null values in your Go code.
Are nested JSON objects supported?
Yes. Nested objects are automatically converted into separate named Go structs. Arrays of objects become slice types referencing the generated struct. Deep nesting is fully supported.
How are field names generated?
JSON keys are converted to Go-style PascalCase names. For example, "user_name" becomes "UserName" and "firstName" becomes "FirstName". You can specify a custom root struct name.
Can I convert JSON arrays?
Yes. Paste a JSON array and the tool uses the first element to infer the struct definition. The generated Go type will be a slice ([]StructName) of the inferred struct.
Is my JSON data sent to a server?
No. All conversion happens entirely in your browser using JavaScript. Your JSON data never leaves your device, ensuring complete privacy and security.
What is this tool useful for?
It's ideal for Go developers working with REST APIs, configuration files, or database responses. Instead of manually writing struct definitions, you get production-ready Go code in seconds.
Is this tool free to use?
Yes, completely free with no registration required. There are no usage limits — convert as many JSON inputs as you need.
How to Use JSON to Go Struct
Turn any JSON snippet into ready-to-use Go struct definitions without leaving your browser. Everything runs locally, so private API payloads never leave your machine.
- Paste the JSON you want to convert into the input editor; the Go code appears instantly in the output panel.
- Enter a package-level name in the "Struct Name:" field, for example User or OrderResponse.
- Under "Number Type:" select float64 for general decimals or int64 for fields that are always whole numbers.
- Check "Add json tags" to emit json field tags, and "Add omitempty" so zero values are skipped when marshalling.
- Enable "Flatten nested" if you prefer nested objects inlined into one struct instead of separate types.
Choose int64 for counters and IDs, but keep float64 when JSON numbers may be fractional — Go does not convert between the two automatically.
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