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Format and beautify Solidity smart contract code with consistent indentation, proper spacing, bracket alignment, and syntax validation following Solidity style guide best practices for Ethereum development.
Note: AI can make mistakes, so please double-check it.
Common questions about this tool
Paste your Solidity code into the formatter, and it automatically applies consistent indentation, proper spacing around operators, aligns brackets and braces, and formats function definitions, modifiers, and events according to Solidity style guide standards.
Yes, the formatter validates Solidity syntax and detects errors like missing semicolons, incorrect modifier usage, invalid function signatures, and syntax issues. It provides error messages to help you fix issues before deploying contracts.
The formatter supports all Solidity features including contracts, interfaces, libraries, structs, enums, functions, modifiers, events, inheritance, and complex nested structures. It handles Solidity 0.8.x syntax correctly.
Yes, the formatter handles files with multiple contracts, interfaces, and libraries. It maintains proper formatting for each contract and ensures consistent style across all definitions in the file.
No, formatting only changes whitespace and indentation. It doesn't modify code logic or structure, so gas costs remain unchanged. Formatting improves readability and maintainability without affecting contract functionality.
Verified content & sources
This tool's content and its supporting explanations have been created and reviewed by subject-matter experts. Calculations and logic are based on established research sources.
Scope: interactive tool, explanatory content, and related articles.
ToolGrid — Product & Engineering
Leads product strategy, technical architecture, and implementation of the core platform that powers ToolGrid calculators.
ToolGrid — Research & Content
Conducts research, designs calculation methodologies, and produces explanatory content to ensure accurate, practical, and trustworthy tool outputs.
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Learn what this tool does, when to use it, and how it fits into your workflow.
Solidity Formatter helps you format smart contract code written in Solidity. It applies consistent indentation, proper spacing, and bracket alignment. The tool follows Solidity style guide best practices for Ethereum development.
Smart contract code must be readable and maintainable. Poor formatting makes code hard to understand. It increases the risk of bugs. It makes code reviews difficult. Consistent formatting solves these problems.
This tool formats Solidity code automatically. It fixes indentation issues. It aligns brackets and braces. It standardizes spacing. It makes code look professional and consistent.
This tool is for Solidity developers, smart contract auditors, and blockchain teams. Beginners can use it to learn proper formatting. Experienced developers can use it to maintain style consistency. Teams can use it to enforce coding standards.
Solidity is a programming language for writing smart contracts. Smart contracts run on blockchain networks like Ethereum. They handle cryptocurrency transactions. They execute business logic automatically.
Smart contracts are permanent once deployed. They cannot be changed easily. Bugs can cause serious problems. Lost funds cannot be recovered. Security is critical.
Code formatting matters for smart contracts. Readable code is easier to review. It helps find security issues. It makes maintenance simpler. It reduces the chance of bugs. A related operation involves formatting JavaScript as part of a similar workflow.
Solidity has a style guide. It recommends 4-space indentation. It specifies bracket placement. It defines spacing rules. Following these rules creates consistent code.
But formatting code manually is tedious. Developers forget spacing rules. They mix indentation styles. They create inconsistent code. This makes reviews harder.
Some formatters require perfect syntax. They fail on code with errors. This is frustrating during development. You cannot format code until it compiles.
This tool works differently. It formats code even with syntax errors. It uses structure tracking instead of perfect parsing. It helps you format code at any stage of development.
Developers use this tool to format new smart contracts. They write code quickly without worrying about formatting. The tool makes it look professional automatically.
Code reviewers use it to standardize submitted code. They format code before reviewing. This makes reviews faster and more consistent. For adjacent tasks, beautifying source code addresses a complementary step.
Teams use it to enforce coding standards. Everyone formats code the same way. This creates uniform codebases across projects.
Students use it to learn Solidity formatting. They see how code should look. They understand style guide rules better.
Auditors use it to prepare code for security review. Formatted code is easier to analyze. It helps find vulnerabilities faster.
Developers use AI analysis to improve code quality. They get suggestions for better practices. They learn about security concerns.
Open source contributors use it to format pull requests. They ensure code matches project style. This makes contributions more professional.
The formatter processes code line by line. It tracks indentation level based on braces. Opening braces increase indentation. Closing braces decrease indentation. When working with related formats, formatting JSON data can be a useful part of the process.
Indentation uses 4 spaces per level. This matches Solidity style guide recommendations. Each nested block adds 4 more spaces.
Brace counting tracks opening and closing braces. It counts braces on each line. It updates indentation level accordingly. This handles nested structures correctly.
Closing brace detection checks if a line starts with a closing brace. It decreases indentation before formatting. This ensures proper alignment.
Error detection finds unmatched braces. It checks if indentation level goes negative. It warns about unclosed blocks at the end. These help identify syntax problems.
Long line preservation skips formatting for lines over 1,000 characters. These lines are kept unchanged. This prevents issues with complex expressions.
Input validation checks file size first. Files over 500KB are rejected. Line count over 10,000 is rejected. Lines over 1,000 characters trigger warnings. In some workflows, formatting HTML markup is a relevant follow-up operation.
AI analysis truncates code to 50KB for processing. Very large files are shortened. This keeps AI responses fast and accurate.
Error tolerance allows formatting with syntax errors. The formatter uses structure tracking instead of parsing. It formats what it understands. It reports issues without failing.
| Input Limit | Value | Reason |
|---|---|---|
| Maximum File Size | 500KB | Prevents browser performance issues |
| Maximum Lines | 10,000 lines | Keeps processing time reasonable |
| Maximum Line Length | 1,000 characters | Prevents formatting issues with complex expressions |
| AI Processing Limit | 50KB | Keeps AI responses fast and accurate |
| Indentation Size | 4 spaces | Matches Solidity style guide |
| Error Type | Description | Action Required |
|---|---|---|
| Error | Critical issue that prevents proper formatting | Must fix before formatting |
| Warning | Potential issue that may cause problems | Should review and fix |
| Hint | Suggestions for improvement | Optional improvements |
| View Tab | Content | When to Use |
|---|---|---|
| Formatted Output | Formatted Solidity code | When reviewing formatted code |
| AI Analysis | Code explanation, suggestions, security notes | When seeking code improvements |
Format code regularly during development. Do not wait until the end. Regular formatting makes code easier to read and review.
Review error messages carefully. They help identify syntax problems. Fix errors before deploying contracts. Syntax errors can cause deployment failures.
Use AI analysis for code review. It provides valuable insights. But do not rely on it completely. Always review suggestions yourself.
Check security notes before deployment. Smart contracts handle real money. Security issues can cause serious problems. Address all security concerns. For related processing needs, formatting CSS handles a complementary task.
Keep files under 500KB for best performance. Very large files may be slow to format. Consider splitting large contracts into multiple files.
Understand that formatting does not change code logic. It only changes whitespace and indentation. Gas costs remain unchanged. Functionality stays the same.
Use consistent formatting across your project. Format all files the same way. This creates professional, uniform codebases.
Learn Solidity style guide rules. Understanding formatting helps you write better code. The tool helps, but knowledge is valuable.
Be aware that the formatter is error-tolerant. It formats code even with syntax errors. But you should fix errors before deployment.
Review AI suggestions carefully. Not all suggestions may be appropriate. Use your judgment based on your specific needs.
Test formatted code before deploying. Formatting should not change functionality. But always verify that code still works correctly.
Use the sample code to learn formatting. Modify it to see how formatting changes. This helps you understand the tool better.
Copy formatted code instead of retyping. This prevents mistakes. It saves time when working with multiple files.
Remember that formatting improves readability. But it does not fix logic errors. Always test your code thoroughly before deployment.
We’ll add articles and guides here soon. Check back for tips and best practices.
Summary: Format and beautify Solidity smart contract code with consistent indentation, proper spacing, bracket alignment, and syntax validation following Solidity style guide best practices for Ethereum development.