JSON to C (cJSON) Converter

How to use

1. Paste a representative JSON payload that matches the config, response, or file structure your C code actually parses.
2. Review the generated forward declarations, `struct` definitions, and cJSON-oriented field layout for nested objects and arrays.
3. Copy the output into your C project and add parse, allocation, or cleanup helpers that match your runtime ownership rules.

Benefits

• Produces C-native struct scaffolding that fits cJSON-driven parsing flows.
• Keeps nested payloads in explicit structs instead of repetitive manual cJSON tree walking.
• Speeds up embedded, firmware, and systems integrations that still rely on plain C transport models.

Best use cases

• Embedded firmware or device tools that parse compact JSON config files with cJSON.
• Native C SDKs that need readable transport structs before handwritten parser glue is added.
• Systems projects replacing ad hoc key lookup code with explicit typed models.

cJSON struct tips

• Review string ownership and array allocation strategy before wiring generated structs into production parse flows.
• Keep one realistic payload sample so nested structs and scalar widths line up with the data you actually receive.
• Add constructor, parser, and cleanup helpers after generation because this route focuses on struct scaffolding first.

Sample JSON

{
  "id": 101,
  "name": "Ada Lovelace",
  "active": true,
  "roles": ["admin", "editor"],
  "profile": {
    "email": "ada@example.com",
    "score": 9.8
  }
}

Sample cJSON-ready C output

#include <stdbool.h>
#include <stddef.h>
#include "cJSON.h"

typedef struct UserModel UserModel;

struct UserModel {
  int id;
  char *name;
  bool active;
};

FAQ