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Grit

Grit scans millions of lines of code to find patterns and fix them automatically, filling a critical gap in code maintenance

You type regular code snippets. Grit treats them as queries. No wrestling with abstract syntax trees or learning arcane query languages first. Want deprecated API calls? Just paste the pattern. The real power hits…

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Grit scans millions of lines of code to find patterns and fix them automatically, filling a critical gap in code maintenance.

You type regular code snippets. Grit treats them as queries. No wrestling with abstract syntax trees or learning arcane query languages first. Want deprecated API calls? Just paste the pattern.

The real power hits massive codebases. Grit scales to 10M+ lines thanks to Rust-powered optimization. A senior platform engineer migrating legacy authentication across dozens of microservices would find this useful — especially when each service has different implementations that need standardizing.

Built-in auto-fix speeds up remediation. You're not just finding problems. You're solving them in the same step. Grit works across JavaScript. TypeScript. Python. JSON. Java. Terraform. Solidity. CSS. Markdown. YAML. Rust. Go. SQL.

The 200+ standard patterns handle common scenarios. Custom linting lets you exclude specific cases with where clauses, though setting up complex exclusion rules can get fiddly.

Grit integrates with GitHub, VS Code, and CI pipelines. Desktop usage feels more natural for complex migrations, but the VS Code extension works fine for smaller pattern searches on mobile setups. Most developers stick to desktop anyway when dealing with large-scale code changes.

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Frequently asked

6 questions
How does Grit handle code patterns differently than regex or grep?
You just paste actual code snippets as queries -- no regex patterns or grep expressions needed. Grit gets the structure and syntax of your programming language, so it finds semantic matches instead of just text patterns. It won't get confused by formatting differences or comments that'd trip up traditional text search.
What's the largest codebase Grit can actually handle?
Grit scales to 10M+ lines of code thanks to its Rust-powered optimization engine. It's built specifically for massive enterprise codebases where other pattern matching tools would choke. Performance stays consistent even when you're scanning across dozens of microservices or large monorepos.
Can I exclude certain files or directories when running Grit patterns?
Yeah, you can use where clauses to exclude specific cases from your pattern matching. Setting up complex exclusion rules can get fiddly though -- requires some trial and error. Basic exclusions work fine, but advanced filtering might need multiple iterations to get right.
Does Grit work better in VS Code or as a desktop application?
Desktop usage feels more natural for complex migrations and large-scale code changes. The VS Code extension works fine for smaller pattern searches. But most developers stick to desktop when dealing with substantial refactoring projects -- it handles heavy workloads better.
How many built-in patterns does Grit include for common code issues?
Grit comes with 200+ standard patterns. These handle common scenarios like deprecated API calls, security vulnerabilities, and code modernization tasks. They cover the most frequent use cases across all supported languages -- plus you can create custom patterns for organization-specific needs.
Which programming languages can Grit analyze and fix?
Grit supports JavaScript, TypeScript, Python, JSON, Java, Terraform, Solidity, CSS, Markdown, YAML, Rust, Go, and SQL. The auto-fix feature works across all these languages -- so you're not just finding issues but actually resolving them in the same step. Coverage is broad enough for most polyglot development teams.

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