How To Use Rust Formatter & Validator
📝 Step 1: Enter Rust Code
Paste your Rust code in the input area. Supports multiple items, functions, structs, and macros.
⚙️ Step 2: Choose Rust Edition
Select your Rust edition (2015, 2018, or 2021) for accurate formatting and validation.
🔧 Step 3: Format or Validate
Click "Format Rust" to beautify your code with proper indentation and spacing. Click "Validate Rust" to check for syntax errors.
📋 Step 4: Copy or Download
Use the "Copy" button to copy formatted Rust to clipboard, or "Download" to save as .rs file.
💡 Pro Tips
✓ Use the Sample button to load an example Rust program.
✓ Validation checks for: missing semicolons, unmatched braces, invalid attributes, incorrect macro usage.
✓ Formatting follows official Rust style guidelines (rustfmt).
✓ Works with complex code including generics, lifetimes, and closures.
🔍 Example
// Before formatting:
fn main(){let x=5;let y=6;println!("Sum: {}",x+y);}
// After formatting:
fn main() {
let x = 5;
let y = 6;
println!("Sum: {}", x + y);
}
Frequently Asked Questions
What Rust editions are supported? ▼
We support Rust 2015, 2018, and 2021 editions. Each edition has its own syntax rules (e.g., async/await in 2018+, new keywords).
Does it validate all Rust syntax? ▼
The validator checks for common syntax errors including: missing semicolons, unmatched braces/parentheses, invalid attributes, incorrect macro invocation, and basic type errors. It's designed for everyday Rust development.
What formatting options are available? ▼
The formatter adds proper indentation, line breaks, spaces around operators, and organizes imports (basic). It follows the official Rust style guide (rustfmt defaults). Comments and string literals are preserved.
Can I format multiple Rust items? ▼
Yes! The tool handles multiple functions, structs, enums, modules, and even entire files. Each item is formatted independently while maintaining overall readability.
Is my Rust code secure? ▼
Absolutely. All processing happens in your browser with PHP only serving the page. Your code is never sent to our servers. It's completely client-side for privacy and security.
What are common Rust errors it detects? ▼
Common errors include: missing semicolons, unmatched angle brackets in generics, incorrect lifetime syntax, missing 'fn' keyword, invalid attribute syntax, and macro errors.
Does it work with macros and attributes? ▼
Yes, basic macro invocations (println!, vec!, etc.) and attributes (#[derive(Debug)]) are supported. Custom macros may not be fully validated but will be formatted.
How accurate is the validation? ▼
The validator catches most syntax errors but may not catch type mismatches or borrow checker issues (since it doesn't run the compiler). It's great for quick syntax checking and formatting.