About this tool

JSON To Go Struct Generator

Generate production-ready Go structs from JSON with nested objects, arrays, nullable fields, JSON tags, copy, download, and local history.

The JSON to Go Struct Generator turns a pasted JSON payload into compilable Go type declarations, inferring string, bool, int, float64 and interface{} from the actual values and emitting a `json:"..."` tag on every field. Nested objects become their own named structs, arrays of objects are merged so a field that appears in only some elements still gets declared, and you choose whether nullable fields render as pointers (*string) or as interface{}. It is built for Go developers wiring up a client against an API they only have sample responses for.

How to use JSON To Go Struct Generator

1. 1

   Open JSON To Go Struct Generator on AltFTool — it loads instantly in your browser.

2. 2

   Paste your payload into the JSON Editor ('Paste valid JSON here...'), or press Upload to load a .json or .txt file, then name the Root struct name and Package name in the Settings box.

3. 3

   Under Null values choose 'Pointer when type is known' for types like *string or 'interface{} fallback', and press Beautify or Minify to reshape the input — the structs regenerate as you type.

4. 4

   Read the Generated Go Preview with its JSON size, Fields, Structs, Depth and Lines tiles, then press Copy, Download for AutoGenerated.go, or Save to keep it under Recent Structs.

Why use JSON To Go Struct Generator

• Merges every array element

  Fields are collected across all objects in a JSON array, so optional keys present in only one record still appear in the struct.

• Idiomatic Go naming

  Keys are converted to exported PascalCase and known initialisms like ID, URL, API, UUID and HTTP stay fully capitalised.

• Nullable handling you control

  Switch between pointer types for fields that ever appear as null and a plain interface{} fallback, and see the difference immediately.

Common use cases

• You captured a JSON response from a third-party API and need matching Go structs to unmarshal it, without hand-typing forty fields and their json tags.
• A webhook payload has objects nested four levels deep and you want each level split into its own named struct instead of one giant map[string]interface{}.
• Your sample array has records where some keys are missing or null, and you need to see which fields should be pointers before you write the decoder.

Frequently asked questions