JSON to Go Struct Converter
Paste any JSON and instantly get clean Go structs — nested objects, arrays, and JSON tags all handled automatically. No sign-up, no server, 100% private.
// Go structs will appear here
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Last updated: May 22 2026
Reviewed by the QuickTooly Team
JSON to Go Struct Guide
Why Use QuickTooly's JSON to Go Struct Converter?
- Instant live preview: Go structs appear as you type — no button press needed.
- Deep nesting support: Nested JSON objects become their own named structs automatically.
- JSON tags included: Every field gets a correct
`json:"key"`tag by default — ready forencoding/json. - Smart array handling: Arrays of objects are merged into a single struct; missing keys become pointer fields.
- Pointer fields toggle: Wrap all types with
*for nullable or optional JSON fields. - PascalCase convention:
snake_case,camelCase, andkebab-casekeys are all converted to exported Go field names. - 100% free & private: Your JSON never leaves your browser — no server, no logging, unlimited usage.
What Is a Go Struct?
A Go struct is a composite data type that groups together fields under a single name. Structs are the primary way to model structured data in Go, and they integrate directly with the standard library's encoding/json package for marshalling and unmarshalling JSON. Adding `json:"fieldName"` struct tags maps each Go field to its JSON key, enabling seamless round-trip serialization.
When consuming REST APIs or reading JSON config files in Go, defining typed structs means the compiler catches missing or misspelled field accesses at compile time instead of at runtime. It also gives you IDE autocompletion, zero-cost type assertions, and self-documenting code that makes your data shape explicit to every reader of the codebase.
How This Converter Works
The converter walks the JSON tree recursively and maps each JSON type to its Go equivalent:
- String →
string - Integer number →
int - Decimal number →
float64 - Boolean →
bool - Null →
interface{} - Object → a named
structblock - Array of objects → element struct merged from all items, type becomes
[]StructName - Array of primitives →
[]string,[]int, etc. - Empty array →
[]interface{}
How to Use This Tool
- Paste your JSON into the left panel — the converter runs instantly
- Set the struct name to match your domain model (e.g.
User,ApiResponse) - Toggle Pointer fields to wrap all types with
*— useful when the API may omit or null any field - Click Copy and paste the structs into your Go project
Go Struct Naming Conventions
Go requires exported struct fields to start with an uppercase letter. This converter automatically converts any JSON key format — snake_case, camelCase, or kebab-case — to PascalCase while preserving the original key in the JSON struct tag. Nested struct types are named by combining the parent struct name with the field name in PascalCase (e.g., a address field inside Root produces RootAddress), avoiding any naming conflicts across deeply nested schemas.
Frequently Asked Questions
Does this tool send my JSON to a server?
No. All conversion happens locally in your browser using plain JavaScript. Your JSON data never leaves your device and is never stored or logged.
What do JSON struct tags do in Go?
Struct tags like `json:"user_id"` tell the encoding/json package which JSON key maps to which struct field. Without tags, Go uses the exact field name, so a field named UserID would only match a JSON key also named UserID. Tags let you use idiomatic Go names while matching any JSON key format.
When should I use pointer fields?
Use pointer fields (e.g., *string) when a JSON key may be absent or explicitly null. A pointer field defaults to nil when the key is missing, letting you distinguish "field not present" from "field is zero value." For required fields with guaranteed values, non-pointer types are simpler and safer.
How are arrays of objects handled?
All objects in the array are merged into a single struct definition. Keys that appear in some objects but not others are automatically treated as optional — enable the Pointer fields toggle to make them *Type in the output.
How are nested objects named?
Nested structs are named by combining the parent struct name with the field key in PascalCase. For example, an address field inside Root produces a struct named RootAddress, avoiding conflicts across a deeply nested schema.
Can I convert a JSON array at the root level?
Yes. If the root JSON value is an array of objects, the converter merges all items into a single struct and names it RootItem. A type Root = []RootItem type alias is also emitted so you have both the slice type and the item struct available immediately.