Convert TOML to C++ online, free. TOML is a readable configuration format built around key/value pairs and tables. C++ structs model data and pair with nlohmann/json for (de)serialization. TOML to C++ conversion parses your TOML against the TOML v1.0.0 grammar (https://toml.io/en/v1.0.0), builds an in-memory model of its keys, nested objects and arrays, then emits ready-to-use C++ types following the nlohmann/json conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include native & game engines, high-performance services and embedded systems.
It maps the full structure of your TOML onto idiomatic C++ types, following the nlohmann/json conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Paste TOML and generate C++ types from C++ immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.
Nested TOML objects, tables and arrays are mapped faithfully onto C++, including nested types and optional fields.
Your TOML never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.
Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.
A TOML document and its C++ equivalent:
TOML input:
host = "db.internal"
port = 5432
secure = trueOutput:
struct Server {
std::string host;
int port;
bool secure;
};Paste your TOML into the editor and press "Convert to C++". The tool parses it against the TOML v1.0.0 grammar, then generates C++ types following nlohmann/json conventions — instantly and entirely in your browser. You can validate or format the TOML first to be sure it is clean.
TOML values are typed and it has first-class dates and times, so they carry into C++ cleanly. TOML tables become nested C++ types, and arrays-of-tables become lists.
Optional or nullable members in the generated C++ are inferred from keys missing in some records of your TOML, following nlohmann/json. Include the optional fields in your sample so they are typed correctly.
TOML (Tom's Obvious Minimal Language) (TOML) — TOML is a readable configuration format built around key/value pairs and tables. C++ structs (C++) — C++ structs model data and pair with nlohmann/json for (de)serialization. This converter maps the structure of your TOML onto C++ so you can use it for native & game engines.
Yes. Invalid TOML is flagged with a clear error before anything is converted. Common TOML problems to check are correct key/value pairs, quoted strings, and valid [table] headers. Starting from clean input keeps the generated C++ accurate.
Yes. The entire TOML-to-C++ conversion runs locally in your browser in JavaScript — your TOML is never uploaded, logged or stored. That matters when the data is something like Rust Cargo & Python pyproject config, which should not leave your machine.
The generated C++ is ready for native & game engines, high-performance services and embedded systems. Copy or download it and drop it straight into your codebase.
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