Convert TOML to Kotlin online, free. TOML is a readable configuration format built around key/value pairs and tables. Kotlin data classes model structured data with null-safety. TOML to Kotlin 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 Kotlin types as data classes with nullable types following the Kotlin docs 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 Android apps, Ktor services and kotlinx.serialization.
It maps the full structure of your TOML onto idiomatic Kotlin types, following the Kotlin docs 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 Kotlin types from Kotlin 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 Kotlin, 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 Kotlin equivalent:
TOML input:
host = "db.internal"
port = 5432
secure = trueOutput:
@Serializable
data class Server(
val host: String,
val port: Int,
val secure: Boolean,
)Paste your TOML into the editor and press "Convert to Kotlin". The tool parses it against the TOML v1.0.0 grammar, then generates Kotlin types following Kotlin docs 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 Kotlin cleanly. TOML tables become nested Kotlin types, and arrays-of-tables become lists.
Optional or nullable members in the generated Kotlin are inferred from keys missing in some records of your TOML, following Kotlin docs. 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. Kotlin data classes (Kotlin) — Kotlin data classes model structured data with null-safety. This converter maps the structure of your TOML onto Kotlin so you can use it for Android apps.
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 Kotlin accurate.
Yes. The entire TOML-to-Kotlin 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 Kotlin is ready for Android apps, Ktor services and kotlinx.serialization. Copy or download it and drop it straight into your codebase.
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