JSON to Go Struct Generator (Golang Type Maker)
For backend engineers building cloud-native applications in Go, mapping incoming JSON payloads to strongly-typed structs is a frequent, manual task. This tool automates that process by scanning your JSON structure, inferring appropriate Go types (int, float64, string, bool), and generating recursive structs with standard `json` tags. It runs 100% in your browser, keeping your API payloads private and secure.
100% Private & Secure
This tool runs completely inside your browser using client-side WebAssembly and JS. Zero data is ever sent to our servers.
Input JSON
Golang Structs
How to use this tool
- Paste your sample JSON object or array into the left 'Input JSON' editor.
- The tool instantly analyzes the keys and values to determine the hierarchy.
- Customize the 'Main Struct Name' to match your internal naming conventions.
- Ensure 'Include JSON Tags' is enabled if you plan to use standard `encoding/json` unmarshalling.
- The resulting Go code is displayed on the right. Click 'Copy Go Code' to use it in your project.
Example Usage
{
"user_id": 101,
"active": true,
"meta": { "last_login": "2026-03-15" }
}type AutoGenerated struct {
UserID int `json:"user_id"`
Active bool `json:"active"`
Meta Meta `json:"meta"`
}
type Meta struct {
LastLogin string `json:"last_login"`
}When to use this tool
- Quickly defining Request/Response models when building REST APIs with Gin, Fiber, or Echo.
- Modeling complex configuration files for Kubernetes operators or CLI tools.
- Deciphering large, nested JSON payloads from third-party APIs (Stripe, GitHub, etc.) into clean Go definitions.
- Reducing human error during manual struct definition for high-stakes production services.
Frequently Asked Questions
How does the tool handle nested objects?
The generator works recursively. When it encounters a nested object, it creates a new named struct type for it and appropriately references that type in the parent struct. This ensures your Go code remains modular and readable.
What types does it infer?
It maps JSON numbers to `int` if they are whole numbers, or `float64` if they contain decimals. Booleans map to `bool`, strings to `string`, and arrays to `[]type`. Null values or empty arrays are safely typed as `interface{}`.
Why use JSON tags in Go?
Go structs use PascalCase for exported fields, but JSON often uses snake_case or camelCase. The `json:"tag"` annotation tells the Go compiler exactly which JSON key maps to which struct field during marshalling/unmarshalling.
Can I use arrays of objects?
Yes. If you paste a JSON array containing objects, the tool will analyze the first element to determine the slice type (e.g., `[]UserStruct`).
Is this tool secure for sensitive API data?
Absolutely. Like all DevToolsLabs utilities, the processing happens entirely on your local machine using client-side JavaScript. No data is ever transmitted to our servers.