How to Convert JSON to Go Structs Online (Step by Step)

To convert JSON to a Go struct, paste a representative JSON sample into the ByteTools JSON to Go generator, set a root struct name, and click Generate. In seconds you get idiomatic Go structs with exported PascalCase fields and json:"originalKey" tags you can copy straight into a package.

Hand-writing structs for every API response is slow and error-prone: it is easy to misspell a tag, forget an omitempty, or mistype an int as a float64. This tutorial walks through the whole flow, explains what each option does, and shows why doing it in the browser keeps your payloads private.

Step-by-step: JSON to Go in four moves

1. Paste a representative sample. Drop in real JSON that includes every field you care about. The generator infers types from the values it sees, so the more complete your sample, the more accurate the struct.
2. Set the root struct name. It defaults to AutoGenerated, but naming it after the resource — User, Invoice, WeatherResponse — gives you code you can use without renaming.
3. Click Generate. The tool walks the structure, converts keys to exported PascalCase, adds json tags, builds nested structs for nested objects, and uses slice types for arrays.
4. Copy or download. Send the result to your clipboard or save it as a .go file and drop it into your package.

A worked example

Given this input:

{
  "id": 42,
  "name": "Ada",
  "active": true,
  "score": 9.5,
  "roles": ["admin", "editor"]
}

the generator produces something like:

type User struct {
  ID     int      `json:"id"`
  Name   string   `json:"name"`
  Active bool     `json:"active"`
  Score  float64  `json:"score"`
  Roles  []string `json:"roles"`
}

Notice id became int (a whole number) while score became float64 (it has a decimal point), and the string array became []string. Every field keeps a json tag with the original wire key, so encoding and decoding round-trip cleanly.

What the options and inference rules mean

Why do it in the browser

Type inference here runs entirely in your browser with JavaScript. Your JSON is never uploaded or stored, which matters when the sample is an internal API response, an unreleased payload, or a confidential data model. Because it is a client-side PWA, it also works offline once loaded, so you can generate structs on a plane or inside a locked-down network.

Try the JSON to Go Struct generator — free and 100% in your browser.

FAQ

Do I need to paste the whole API response?

No, but include one complete example of every object shape. The generator infers types from the values present, so a sample missing optional fields will produce a struct missing those fields.

How do I rename a generated nested struct?

Generate first, then rename the nested type and its reference in the parent field. The tool names nested structs from their keys, which is a sensible starting point you can refine.

Can I paste an array at the top level?

Yes. A top-level array is treated as a slice, and the element shape is inferred into a struct that the slice references.

Will the generated code compile as-is?

Yes. The output is valid, gofmt-friendly Go you can drop into a package. You may still want to adjust names or add custom tags for your own conventions.

Related free tools

• JSON to TypeScript — the same idea for front-end and Node projects.
• JSON Formatter — tidy and indent your sample before converting.
• JSON Validator — confirm the sample is valid first.
• JSON to CSV Converter — flatten records into spreadsheet rows.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio that builds web apps, SaaS platforms, and custom software. If your team needs more than a converter, explore what ByteVancer can build for you.