JSON to Go Struct Generator

Convert JSON to Go struct definitions instantly. Generate idiomatic Go code with json tags, omitempty, and proper PascalCase field names. Free, no signup.

Generated Go struct will appear here...

Field names are converted to PascalCase following Go conventions. Nested objects become separate structs unless inline mode is enabled.

How to Convert JSON to Go Struct Online

  1. 1

    Paste Your JSON Data

    Copy a JSON response from your API, config file, or database export and paste it into the input panel. The tool accepts any valid JSON including deeply nested objects, arrays, and mixed types.
  2. 2

    Configure Struct Options

    Set your root struct name, enable JSON tags for proper serialization, toggle omitempty for optional fields, and choose whether to inline nested structs or generate them as separate type definitions.
  3. 3

    Generate the Go Struct

    Click Generate Go Struct. The tool infers Go types from your JSON values, converts field names to idiomatic PascalCase, and produces clean struct definitions with the correct json tags attached to each field.
  4. 4

    Copy or Download the Output

    Click Copy to place the generated Go code on your clipboard, or Download .go to save it as a file. Paste the struct directly into your Go project and start unmarshaling JSON immediately.

Common Use Cases

1

Consuming REST API Responses

When integrating with third-party REST APIs in Go, you need struct definitions that match the JSON response shape. Paste a sample API response into this tool to generate the exact struct types needed for json.Unmarshal, eliminating guesswork about field names and types.
2

Building Go Microservices

Microservices exchange data via JSON. Generating struct definitions from the JSON contract ensures your Go service correctly serializes and deserializes payloads. This is especially useful when onboarding onto an existing API where the JSON schema is defined but Go types are not.
3

Migrating from Dynamic Languages to Go

Teams moving from Python, JavaScript, or Ruby to Go need to define explicit types for data that was previously handled dynamically. Paste existing JSON payloads to quickly scaffold the Go type system required for a statically typed codebase.
4

Prototyping and Rapid Development

During early development, API shapes change frequently. Instead of manually updating struct definitions after every schema change, paste the latest JSON sample and regenerate the structs in seconds. This keeps your Go code in sync with evolving APIs.

Why Use JSON to Go Struct?

When working with JSON APIs in Go, you need to define struct types to marshal and unmarshal data. This tool automatically generates idiomatic Go structs from JSON samples, including proper JSON struct tags and type inference, saving you time and reducing errors.

Go requires explicit type definitions for JSON data. Every field that you want to read from or write to JSON needs a corresponding struct field with the correct type and a json tag that maps it to the JSON key name. Writing these structs by hand is tedious, especially for large or deeply nested API responses with dozens of fields. A single typo in a tag or an incorrect type causes silent data loss during unmarshaling, making manual struct writing both slow and error-prone.

This free online JSON to Go struct generator handles the entire conversion automatically. Paste any valid JSON, configure your options, and get production-ready Go code in seconds. The tool converts JSON keys to idiomatic PascalCase field names, infers the correct Go types from values, and attaches properly formatted json struct tags. You can enable omitempty for optional fields, inline nested objects for simpler structures, or generate separate named struct types for better reusability. Everything runs in your browser with no data sent to any server, so it is safe to use with API keys, tokens, and internal payloads.

For related conversions, try the JSON to TypeScript generator if you also work in TypeScript, or the JSON to Java Class tool for JVM projects. If you need to validate or clean up your JSON before converting, the JSON Formatter and JSON Schema Validator are useful companions. To explore complex JSON structures visually before generating structs, use the JSON Visualizer.

How It Compares

Many online JSON-to-Go converters send your data to a backend server for processing. This raises privacy concerns when working with internal API responses, authentication tokens, or production database exports. FindUtils JSON to Go Struct Generator runs entirely in your browser. Your JSON never leaves your device, there are no file size limits imposed by a server, and no account is required.

Compared to IDE plugins like GoLand's built-in converter or VS Code extensions, this browser-based tool requires zero installation and works from any device. Unlike command-line tools such as json-to-go or gojson that need Go installed locally, this tool is instantly accessible at a shareable URL. It also provides a visual interface for configuring struct options like omitempty and inline mode, which CLI tools require as flags or manual editing. There are no usage caps, no ads, and no premium tiers.

Go Struct Generation Tips

1
Use a representative JSON sample that includes all possible fields. If a field is sometimes missing from the response, add it manually with a sample value so the generator produces the correct type and you can add omitempty afterward.
2
Enable omitempty for optional fields that may not always be present in API responses. This prevents Go from serializing zero-value fields back into JSON, keeping your payloads clean and matching the original API contract.
3
For deeply nested JSON, start with separate structs rather than inline mode. Separate type definitions are easier to reuse across your codebase and simpler to test independently.
4
After generating the struct, review the inferred types. JSON numbers are mapped to float64 by default because JSON has no integer type. Change float64 to int or int64 for fields you know are always whole numbers.
5
Combine this tool with the JSON Formatter to clean up messy API responses before converting. Well-formatted JSON makes it easier to spot the structure and verify the generated struct matches your expectations.

Frequently Asked Questions

1

What are JSON struct tags?

JSON struct tags in Go tell the encoding/json package how to map struct fields to JSON keys. They're essential for proper serialization when field names differ between Go (PascalCase) and JSON (camelCase or snake_case).
2

When should I use omitempty?

Use omitempty when you want to exclude zero-value fields from JSON output. This is useful for optional fields that shouldn't appear in the JSON when not set, such as nullable API response fields or optional request parameters.
3

Should I inline nested structs?

Inline structs are useful for simple, one-off nested objects. For reusable types or complex structures, separate struct definitions are cleaner and more maintainable. If the nested object appears in multiple places in your codebase, always use a named type.
4

How does the tool infer Go types from JSON?

JSON strings map to Go string, booleans to bool, null to a pointer type, arrays to slices, and nested objects to separate struct types. JSON numbers map to float64 by default because JSON does not distinguish between integers and floats. You should manually change float64 to int or int64 for fields that are always whole numbers.
5

Is it safe to convert JSON with sensitive data?

Yes. This tool processes everything in your browser using JavaScript. Your JSON data never leaves your device and is never sent to any server. This makes it safe for converting API responses that contain tokens, keys, credentials, or internal business data.

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