What is JSON to V Struct Generator?
This tool converts JSON data into V language struct definitions with proper type inference. It automatically maps JSON types to V types (string, int, f64, bool) and handles nullable fields with option types and nested objects as separate structs.
How to Use
- Set the module name for the generated V code
- Paste your JSON data into the input area
- Click "Generate" and copy the V structs into your project
Why Use This Tool?
Tips & Best Practices
- V structs use snake_case for field names
- Option types in V use the ? prefix syntax
- V uses f64 for floating point by default
- Arrays use []Type syntax in V
Frequently Asked Questions
How are JSON types mapped to V types?
JSON strings map to string, integers to int, floats to f64, booleans to bool, null to ?Type (V option type), arrays to []Type, and nested objects to separate struct definitions.
What is the ?Type option syntax in V?
In V, ?Type is an option type that can hold either a value of the given type or none. When "Use option types for nullable fields" is enabled, JSON null values are mapped to ?Type, making your structs explicitly represent the possibility of missing data.
How does json.decode work in V?
V's json.decode function takes a struct type and a JSON string, returning an option. The ! operator unwraps it or panics on error. For example: data := json.decode(Root, json_string)! decodes the JSON into a Root struct instance.
Can I change the module name in the generated code?
Yes, you can set any valid V module name using the module name input field. The default is "main", which is used for executable programs. Use a custom name if you are building a library module.
Is my data sent to a server?
No, all processing happens entirely in your browser. Your JSON data never leaves your device.