--- title: "JSON to Go Struct Generator" description: "Convert JSON to Go struct definitions instantly. Generate idiomatic Go code with json tags, omitempty, and proper PascalCase field names. No signup." url: https://findutils.com/developers/json-to-go-struct/ category: developers --- # 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. No signup. **Use this tool:** [JSON to Go Struct Generator](https://findutils.com/developers/json-to-go-struct/) ## Programmatic access - REST id `json-to-go-struct`: POST https://api.findutils.com/api/tools/json-to-go-struct/execute (reference: https://findutils.com/api/json-to-go-struct/) - MCP tool `json_to_go_struct` on https://mcp.findutils.com (reference: https://findutils.com/mcp/json-to-go-struct/) ## 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 Struct Generation Tips - 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. - 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. - 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. - 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. - 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 ### 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). ### 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. ### 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. ### 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. ### 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. ### Can I convert JSON arrays to Go structs? Yes. If your JSON root is an array of objects, the tool generates a struct type for the array element. You can then use the struct as []YourStructName in your Go code to unmarshal the entire array. ### What naming convention does the generator use? The generator converts JSON keys to PascalCase following Go naming conventions. For example, user_name becomes UserName, and firstName becomes FirstName. The original JSON key is preserved in the json struct tag so serialization remains correct. ### Does the JSON to Go struct converter require a signup? No. It works with no signup, no usage limits. You can generate Go structs as many times as you need without creating an account or paying for a premium plan. ### How do I handle JSON fields with null values? When a JSON field has a null value, the tool generates a pointer type in Go (e.g., *string instead of string). Pointer types correctly represent nullable fields and allow you to distinguish between a missing field and a zero-value field during unmarshaling. ### Can I use the generated struct with json.Marshal too? Yes. The generated struct works for both json.Unmarshal (reading JSON) and json.Marshal (writing JSON). The json struct tags ensure fields map correctly in both directions. If you enabled omitempty, zero-value fields are excluded when marshaling back to JSON. ## Related Tools - [JSON to TypeScript](https://findutils.com/developers/json-to-typescript/) - [JSON to Liquid](https://findutils.com/developers/json-to-liquid/) - [JSON to Java Class](https://findutils.com/developers/json-to-java-class/) - [JSON to Python Class](https://findutils.com/developers/json-to-python-class/) - [JSON to Zod Schema](https://findutils.com/developers/json-to-zod-schema/) - [JSON Formatter](https://findutils.com/developers/json-formatter/) - [JSON Schema Generator](https://findutils.com/developers/json-schema-generator/) - [JSON Visualizer](https://findutils.com/developers/json-visualizer/) - [JSON Schema Validator](https://findutils.com/developers/json-schema-validator/)