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Semgrep

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description Semgrep Overview

Source-code patterns are the foundation of Semgrep, a static analysis tool used to find suspicious code and enforce development rules. Its patterns resemble the language being checked, allowing teams to express project-specific checks without building a compiler tool from scratch. Analysis can run locally or in automated development workflows, giving developers feedback while changes are still under review. The open-source engine is distinct from Semgrep's commercial platform and from rules that have separate licensing terms.

This distinction matters when assessing customization or reuse. It suits security-conscious teams that want explicit, inspectable checks for recurring mistakes, alongside broader platform features where needed. AI-assisted features do not replace the underlying rule-based analysis, and findings require assessment in context. Community contributions remain part of the engine's development.

help Semgrep FAQ

What does Semgrep scan in a codebase?

Semgrep scans source code using rules that look for patterns in languages such as Python, JavaScript, TypeScript, Go, and Java. Teams use it for bug finding, security checks, and enforcing internal code standards.

How is Semgrep different from GitHub Copilot?

GitHub Copilot helps write code, while Semgrep primarily analyzes code that already exists. Semgrep rules can detect risky patterns, such as insecure function use or missing validation, across a repository.

Can developers write custom Semgrep rules?

Yes, custom rules are one of Semgrep's main strengths. A team can encode a local pattern, such as a banned wrapper or required auth check, and run it in CI.

Is Semgrep open source?

Semgrep has an open-source CLI that developers can run locally or in CI. The company also offers commercial platform features for teams that need dashboards, policy management, and broader security workflows.

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