jmap

jmap is a lightweight JSON-to-struct mapper for C, using a simple schema system.

It lets you populate C structs from JSON without manually extracting every field — ideal for config files, API responses, or embedded systems.

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Features

• Minimal schema-based mapping
• Safe assignment with type checks
• Supports strings, integers, and booleans
• Works with JSON strings or files
• No macros, no runtime reflection

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Example

typedef struct {
    char name[64];
    int age;
    bool active;
} Person;

Person p = {0};

JField fields[] = {
    {"name", J_STRING, p.name},
    {"age", J_INT, &p.age},
    {"active", J_BOOL, &p.active}
};

JSchema schema = { fields, 3 };

jmap_parse(json_str, &schema);

JSON input:

{ "name": "Jake", "age": 27, "active": true }

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License

MIT