Developer Tools
JSON to Go Struct Converter
Paste any JSON and get a ready-to-use Go struct with json:"..." tags, correct field types, and PascalCase names. OpenToolLab's JSON to Go struct converter runs entirely in your browser — nothing is uploaded and no Go SDK is needed.
Result
What makes this tool different
Automatic json tags
Every field gets the correct json:"name" tag so encoding/json and unmarshalling just work with your API.
Nested object support
Deeply nested objects become their own exported structs with descriptive PascalCase names.
Array and optional handling
Arrays become slices ([]Type), nullables become interface{}, and mixed types are handled safely.
100% in-browser privacy
Type inference happens locally in your browser. Your JSON never touches a server.
About this tool
JSON to Go Struct Converter: everything you need to know
Go's encoding/json package is powerful, but hand-writing structs from JSON is tedious — especially when payloads nest objects, mix arrays, and include optional fields. A JSON to Go struct converter turns a sample response into a correctly tagged struct in seconds, and this one does it entirely in your browser.
OpenToolLab's JSON to Go struct converter infers the right Go type for every field. Strings become string, numbers become int or float64, booleans become bool, arrays become slices like []string, and objects become their own exported structs. Field names are PascalCase for idiomatic Go, and every field gets the matching json:"..." tag so unmarshalling works without extra mapping code.
Nested structures are handled by generating a separate struct for each level, named from the parent property. A payload with a user object, a posts array, and a tags slice becomes a clean set of related structs. Optional and nullable fields are handled safely with interface{} rather than producing broken Go that refuses to compile.
The converter is part of a multi-language engine, so the same JSON can also generate TypeScript, Dart, Kotlin, Swift, or C# from the same window. Paste your payload once, switch languages with a tab, and copy the output for whichever backend or client you are working on.
Privacy is built into the design. Type inference runs entirely in your browser — your API responses, configs, and schemas never leave your device. Open the DevTools Network tab while converting and you will see zero requests.
Use it as part of a real workflow: fetch a sample from your API, convert it to a struct, then json.Unmarshal real responses into that struct. You get compile-time safety, autocomplete, and no more guessing field tags by hand.
FAQ
JSON to Go Struct Converter — frequently asked questions
How can I convert JSON to a Go struct?
Paste your JSON into OpenToolLab's JSON to Go struct converter and click Generate code. The tool infers each field's type and emits a typed struct with json:"..." tags — strings, numbers, booleans, slices, nested objects, and optional fields included.
How do I parse JSON into a struct in Go?
Use encoding/json. Define your struct (the converter generates it for you), then call json.Unmarshal(data, &target). The json tags on each field tell the decoder exactly how to map JSON keys to struct fields.
What is the json:"name" tag in a Go struct?
It is the struct tag that encoding/json reads to match a JSON key to a struct field. For example json:"avatar_url" maps the field to the avatar_url key in your JSON, even when the Go field is named AvatarUrl.
How do I handle nested JSON objects in a Go struct?
Create a nested struct for the inner object and use it as the field's type. This converter does that automatically — a nested object like "user" becomes a User struct, and arrays of objects become []User.
What is interface{} in Go and when is it used for JSON?
interface{} is Go's empty interface, meaning any value. It is used when a field's type is not known ahead of time — for example mixed-type arrays or values that can be null — because encoding/json can decode any value into it.
गो में JSON कैसे लिखते हैं?
Go में JSON के साथ काम करने के लिए encoding/json पैकेज का उपयोग होता है। पहले अपने डेटा के लिए एक struct बनाइए — इस टूल से आप JSON से struct जनरेट कर सकते हैं — फिर json.Unmarshal(data, &struct) से डेटा भरिए और json.Marshal(struct) से JSON बनाइए।
How do I convert a JSON array to a slice of structs in Go?
The converter emits a []StructName type for an array of objects. To parse it, declare the variable as []StructName and pass &slice to json.Unmarshal — Go fills the whole slice with decoded structs.
What do omitempty and required fields mean in Go struct tags?
In a tag like json:"name,omitempty", omitempty tells json.Marshal to skip the field when it holds its zero value. Fields without it are always emitted. This converter writes plain tags; you can add omitempty to optional fields yourself.
Is the JSON to Go struct converter free and private?
Yes. OpenToolLab's JSON to Go struct converter is completely free, requires no signup, and processes everything in your browser — your JSON never leaves your device.
Keep exploring