Free JSON to Go Converter — generate Go structs from JSON in your browser

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🧬 JSON to Go — Free Online Tool

Convert JSON to Go online, free. JSON is the dominant data-interchange format for web APIs and config. Go structs with field tags marshal cleanly to and from data formats. JSON to Go conversion parses your JSON against the ECMA-404 / RFC 8259 grammar (https://www.rfc-editor.org/rfc/rfc8259), builds an in-memory model of its keys, nested objects and arrays, then emits ready-to-use Go types as structs with json field tags following the The Go Programming Language Spec conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include Go microservices, CLIs and encoding/json struct mapping.

🚀 Why use this JSON to Go tool?

It maps the full structure of your JSON onto idiomatic Go types, following the The Go Programming Language Spec conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.

Key Features

⚡Instant, in-browser

Paste JSON and generate Go types from Go immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.

🧩Structure-aware mapping

Nested JSON objects, tables and arrays are mapped faithfully onto Go, including nested types and optional fields.

🔒100% private

Your JSON never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.

🆓Free, no signup

Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.

Popular Use Cases

Typed models from samples

  • • Turn a sample JSON payload into Go types
  • • Skip hand-writing boilerplate models
  • • Keep front-end and back-end shapes in sync

Go microservices

  • • Go microservices
  • • CLIs
  • • encoding/json struct mapping

Onboarding a new API

  • • Paste an example JSON response
  • • Get typed Go to consume it safely
  • • Catch shape mismatches at compile time

What It Handles

Structure

  • ✓ Nested objects & tables
  • ✓ Arrays / lists
  • ✓ Deeply nested documents

Values

  • ✓ Inferred types (string, number, boolean)
  • ✓ Optional / nullable fields
  • ✓ Nested type names

Workflow

  • ✓ Copy or download output
  • ✓ Load an example to try it
  • ✓ Validate & format the input

Worked example

A JSON document and its Go equivalent:

JSON input:

{
  "title": "Dune",
  "pages": 412,
  "available": true
}

Output:

type Book struct {
    Title string `json:"title"`
    Pages int `json:"pages"`
    Available bool `json:"available"`
}

Sources & References

Frequently Asked Questions

How do I convert JSON to Go?

Paste your JSON into the editor and press "Convert to Go". The tool parses it against the ECMA-404 / RFC 8259 grammar, then generates Go types following The Go Programming Language Spec conventions — instantly and entirely in your browser. You can validate or format the JSON first to be sure it is clean.

How is JSON structure represented in Go?

JSON already uses objects, arrays and typed scalars, so mapping to Go is close to one-to-one: objects become types or structs, arrays become lists, and numbers, booleans and null keep their types.

Are optional fields detected when generating Go?

Optional or nullable members in the generated Go are inferred from keys missing in some records of your JSON, following The Go Programming Language Spec. Include the optional fields in your sample so they are typed correctly.

What is the difference between JSON and Go?

JSON (JavaScript Object Notation) (JSON) — JSON is the dominant data-interchange format for web APIs and config. Go (Golang) structs (Go) — Go structs with field tags marshal cleanly to and from data formats. This converter maps the structure of your JSON onto Go so you can use it for Go microservices.

Does the converter validate my JSON first?

Yes. Invalid JSON is flagged with a clear error before anything is converted. Common JSON problems to check are matched braces and brackets, double-quoted keys, and no trailing commas. Starting from clean input keeps the generated Go accurate.

Is my JSON data private?

Yes. The entire JSON-to-Go conversion runs locally in your browser in JavaScript — your JSON is never uploaded, logged or stored. That matters when the data is something like REST/GraphQL API payloads, which should not leave your machine.

Where can I use the Go output?

The generated Go is ready for Go microservices, CLIs and encoding/json struct mapping. Copy or download it and drop it straight into your codebase.

🎓 Pro Tips

  • Tip 1: Validate or format your JSON first (the Validate / Format buttons) so the converter works from clean, ECMA-404 / RFC 8259-conformant input.
  • Tip 2: Give the tool a representative JSON sample — optional fields are only detected from the keys actually present, so include them if they matter.
  • Tip 3: Authoritative reference for the input format: ECMA-404 / RFC 8259 — https://www.rfc-editor.org/rfc/rfc8259.
  • Tip 4: For the output, follow the The Go Programming Language Spec (https://go.dev/ref/spec) conventions in your codebase.

This powerful tool instantly converts JSON to Go type definitions. Simply paste your JSON structure on the top, and the corresponding Go struct will be automatically generated on the bottom. You can easily copy the Go type definition and paste it directly into your code. The tool uses intelligent assumptions for efficient conversion, but it's recommended to double-check the output for accuracy. This tool simplifies Go development by streamlining the process of mapping JSON data to Go structures.

Benefits of Converting JSON to Go Structs in Development:

  • Time-Saving: Automatically generate Go structs from JSON, saving you time on manual coding and reducing the chance of errors.
  • Increased Productivity: Eliminate the need to write repetitive code. Instantly generate Go types to work with APIs and data from various sources without wasting time on structuring.
  • Improved Accuracy: Automatically generate Go types with high precision, ensuring that the structure of your JSON data is accurately represented in Go code.
  • Simplified Code Maintenance: Keep your Go code organized and aligned with the exact structure of incoming JSON data, reducing the need for frequent updates and minimizing errors.
  • Boosted Developer Efficiency: For developers working with external APIs or handling JSON data in Go, this tool streamlines integration and helps you focus on more complex logic.
  • Enhanced Readability: Automatically formatted Go structs make your code cleaner and easier to understand, especially when dealing with large and complex JSON objects.