JSON to Go Struct Generator

How to Use the Free Client-Side JSON to Go Generator

This generator creates Go struct types with json struct tags from a JSON sample, running entirely in your browser. It maps JSON types to Go types, generates nested structs, and can add omitempty to optional fields.

Each generated field carries a json tag that matches the original key name, so unmarshaling works without extra mapping.

1. Copy your JSON data and paste it into the input textarea above.
2. Toggle nullable field handling and omitempty tag preferences.
3. Click Generate, then copy the Go structs or download the .go file.

When to Use JSON to Go

Go services unmarshal JSON into structs, and getting those structs right by hand is error-prone. This generator builds them directly from response samples, which is the quickest path to typed code for a new microservice or a REST client. It is equally useful for turning sample configuration files into struct definitions and for rapid prototyping of type structures before you write the actual handlers.

The generated structs follow Go conventions. Nested objects become separate type definitions with proper JSON tags, and the type inference maps data to strings, float64s, booleans, slices, and maps. Because Go unmarshals every JSON number as float64, you should review numeric fields and promote them to int or int64 where integers are expected. The omitempty option keeps optional fields out of serialized output when they hold zero values, producing cleaner payloads on the way out.

JSON to Go Tips and Best Practices

1. Review all numeric fields after generation, since Go treats every JSON number as float64 by default and you may want int or int64.
2. Use omitempty for fields that are not always present, avoiding zero-value noise in serialized output.
3. Use pointer types for genuinely nullable fields, because a zero value is indistinguishable from a missing field in Go.
4. Keep the json tags intact, since they map field names correctly during marshaling and unmarshaling.

Why Client-Side Privacy Matters for Go Microservice Data Modeling and API Client Development

The responses you model in a microservice often hold operational and customer data, and the structs you generate reveal your internal service contracts. Uploading samples to a generator exposes those structures before your service ships.

This JSON to Go generator runs locally in your browser, so your sample data never leaves your device. You can build data models for production services without leaking their shapes to a third party.