# JSON to Go Struct Converter

> Convert JSON objects into strongly-typed Go Struct definitions and data models.

To convert JSON to Go Struct, paste your JSON payload above and specify the root type name. The generator creates clean, idiomatic Go Struct code definitions instantly in your browser without uploading your JSON data to external servers.

**URL:** https://convertto.tech/t/json-to-go
**Category:** Data & Format Tools (https://convertto.tech/c/data-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## From a JSON sample to a Go struct

Each field comes out exported and carrying a `json:"..."` struct tag holding the original key. Both halves matter. `encoding/json` ignores unexported fields entirely, so a lowercase field marshals to nothing at all, and without a tag the package falls back to a case-insensitive match on the field name, which holds until a key contains an underscore or a hyphen.

## What to fix after pasting

- Optional fields. A `string` the server omits decodes to an empty string, which is indistinguishable from an empty string that really was sent. Use `*string` when absent, null and empty are three different things to your code.
- Output shaping. Add `,omitempty` to the tag on fields that should disappear from marshalled output when they hold a zero value.
- Number widths. Integers infer as `int64` and decimals as `float64`. Narrow them when the API documents a range, and use a decimal type or minor units for money rather than `float64`.
- A JSON `null` infers as `interface{}`, which pushes a type assertion into every call site. Replace it with the real type, or a pointer to it.
- Arrays are typed from their first element. For a genuinely mixed array, `json.RawMessage` is usually a better handle than a slice of `interface{}`, because it defers the decision to a second pass instead of erasing the type.

> **Numbers inside an interface** — Anything decoded into `interface{}` turns every JSON number into a `float64`, including values written as integers. An identifier larger than a float64 can represent exactly loses precision silently that way, which is the strongest argument for generating a concrete struct instead of unmarshalling into a map.

The same payload in other statically typed backends: [JSON to Rust](https://convertto.tech/t/json-to-rust) and [JSON to C#](https://convertto.tech/t/json-to-csharp).

## How to use

1. Enter or paste your json.
2. Enter or paste your root type name.
3. Press Run, then download the result when it is ready.

## FAQ

### Does this JSON to Go Struct converter upload my files?

No, all type generation runs purely in JavaScript in your browser.

## Sources

- [RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format](https://www.rfc-editor.org/rfc/rfc8259) — IETF
- [Go package documentation: encoding/json](https://pkg.go.dev/encoding/json) — The Go Authors

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