JSON to Go Structs

What is JSON to Go Structs?

JSON to Go Structs converts JSON objects into idiomatic Go struct definitions with proper json struct tags, exported field names in PascalCase, and correct Go type mappings. It handles nested objects by generating separate named structs, maps JSON arrays to Go slices, and uses pointer types for nullable fields. The output follows Go naming conventions and gofmt formatting standards.

Go developers building API clients, backend engineers generating handler request types, and systems programmers converting JSON configs to strongly-typed Go code. The tool runs entirely in your browser — your data never leaves your device.

How to Use JSON to Go Structs

1. Paste a JSON object into the input editor
2. Set the root struct name — it becomes the top-level Go type
3. Review the generated Go structs with json tags matching the original JSON field names
4. Toggle options for inline structs versus separate type declarations
5. Copy the Go code and paste it into your .go source file

Common Use Cases

• Generating Go struct definitions from REST API response samples for http client code
• Creating data models from JSON configuration files for Go applications
• Reverse-engineering struct types from third-party API documentation for SDK development
• Converting JSON test fixtures into typed Go struct definitions for test code
• Generating Gin or Echo handler request/response structs from API specification examples

Pro Tips

• JSON fields with lowercase names automatically get json tags like `json:"fieldName"` — Go requires exported (capitalized) field names for JSON marshaling, and tags handle the mapping
• Use pointer types (*string, *int) for fields that can be null in JSON — this distinguishes between an absent field and a zero-value field in Go's type system
• For deeply nested JSON, the tool generates separate named structs — consider whether you want inline anonymous structs or named types, depending on whether the nested structures are reused

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: encoding/json, struct tags, gofmt, Marshal/Unmarshal.

Frequently Asked Questions