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How to Convert TOML to Rust - Step by Step Guide

Step 1

Input Your TOML Configuration

Start by providing your TOML configuration file for Rust struct generation. Whether you're working with Cargo.toml, application configs, or configuration files for your Rust application, you have several convenient options. Use AI assistants like Claude or Grok to further optimize the generated code:

•
Paste directly: Copy your TOML from Cargo.toml, config.toml, or any TOML configuration file
•
Upload a file: Click "Upload" to select a .toml file from your computer
•
Try the sample: Click "Sample" to load example TOML and see how the converter works

Example: TOML Configuration Input

A typical TOML configuration file with nested tables:

[server]
host = "localhost"
port = 8080
ssl_enabled = true

[database]
name = "myapp_db"
max_connections = 100
hosts = ["db1.com", "db2.com"]
Step 2

Automatic Rust Code Generation

The converter instantly generates type-safe Rust structs with proper serde annotations:

•
Type inference: Automatically detects types from TOML values (strings, numbers, booleans, arrays, tables)
•
Nested tables: Creates separate structs for nested TOML tables with proper relationships
•
Serde annotations: Adds #[derive(Serialize, Deserialize)] for TOML serialization

Example: Generated Rust Structs

The same TOML converted to idiomatic Rust code:

use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize)]
pub struct Config {
    pub server: Server,
    pub database: Database,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct Server {
    pub host: String,
    pub port: i64,
    pub ssl_enabled: bool,
}
Step 3

Customize Generation Options

Tailor the generated Rust code to match your project's conventions and requirements:

•
Struct name: Customize the root struct name to match your configuration model
•
Derive traits: Add additional derives like Clone, PartialEq, Default
•
Field visibility: Choose between pub, pub(crate), or private fields
Step 4

Export Your Rust Code

Get your generated Rust structs ready for your project! Multiple export options make integration seamless:

•
Copy to clipboard: One-click copying to paste directly into your .rs files
•
Download as file: Save as a .rs file ready to add to your Rust project
•
Ready-to-compile: Generated code includes all necessary imports and annotations

Frequently Asked Questions

What is TOML and why is it popular in Rust?

TOML (Tom's Obvious Minimal Language) is a simple, human-readable configuration file format. It's the standard format for Cargo.toml in Rust projects and is widely used for application configurations. Converting TOML to Rust structs ensures type-safe configuration loading with compile-time validation.

Can I use this to parse my Cargo.toml?

Yes! While Cargo.toml has a specific structure, you can use this converter to generate structs for custom sections in your Cargo.toml or for your application's TOML configuration files. The generated structs work perfectly with the toml crate for parsing.

What dependencies do I need to use the generated code?

The generated code requires serde with the derive feature andtoml for parsing. Add to your Cargo.toml:serde = { version = "1.0", features = ["derive"] }and toml = "0.8".

How does the converter handle TOML tables and arrays?

TOML tables (sections like [server]) become separate Rust structs. Arrays become Vec<T> with type inference from the array elements. Nested tables create properly structured Rust types with relationships between structs.

Can I convert the generated structs back to TOML?

Yes! With the generated serde annotations, you can serialize the Rust structs back to TOML usingtoml::to_string(). This makes it easy to read configs, modify them in Rust, and write them back to TOML files.

Is the converter free to use?

Yes, completely free with no limitations on file size, complexity, or usage frequency. No registration required, and you can convert unlimited TOML files to Rust structs for your projects.

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