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The best starting point for configurable Perl code-policy checks is Perl::Critic. Add Perltidy when you also want consistent formatting. For security-focused analysis, investigate zarn; for diagnostics in your editor, consider a Perl language server configured to run Perl::Critic. These tools do different jobs, so the right choice depends on whether you want policy checks, formatting, security analysis, or editor integration.
How the four Perl tools differ
| Tool | Primary job | Best fit | Evidence and setup notes |
|---|---|---|---|
| Perl::Critic | Static analysis against configurable coding policies | Teams that want to apply or gradually adopt a coding standard | Project documentation describes CLI, test/build integration, and customizable policies. Requires Perl 5.10.1 or later and relies on PPI. |
| Perltidy | Indentation and source formatting | Developers who want consistent layout and reviewable formatting changes | Project documentation describes command-line options and a CPAN installation path. Requires Perl 5.8.1 or later. |
| zarn | Security-focused static analysis | Developers investigating security analysis for modern Perl applications and dependencies | Available descriptions identify its security focus, but do not establish rule coverage, supported Perl versions, maintenance cadence, or release date. |
| Perl Language Server (PLS) | Editor-facing language features, including optional Perl::Critic linting | Developers who want diagnostics and other language-server features in an editor | The reviewed repository documents editor setup and says Perl::Critic integration is off by default in the described configuration. The roundup uses “perl-lsp”; the reviewed project calls itself Perl Language Server or PLS, and its identity as the exact project intended by that label is not established. |
These are not four interchangeable lint engines. Perl::Critic checks chosen policies; Perltidy rewrites layout; zarn is presented as security-oriented analysis; and PLS connects language features to editors, with linting delegated to Perl::Critic when enabled.
1. Perl::Critic: best for configurable coding standards
Perl::Critic is the clearest choice when “linting” means checking source against a set of coding rules. Its documentation describes an extensible static-analysis framework with distributed policies, many based on Damian Conway’s Perl Best Practices. The project also notes that some policies may contradict that book, so Perl::Critic is not a claim that there is one universally correct Perl style.
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What it checks and how to use it
You can enable, disable, customize, or create policies. Run it from the command line, connect it to tests or builds through Test::Perl::Critic, or use its progressive mode to introduce standards gradually in an existing codebase. That staged approach is useful when a legacy project would otherwise produce too many findings to address at once.
#1 Best Overall
As the project documentation puts it, “Ultimately, you make the rules — Perl::Critic is merely a tool for encouraging consistency.” Treat a finding as a policy mismatch, not proof of a runtime defect; inspect the policy and decide whether it suits your project.
Compatibility and trade-offs
The project documentation says Perl::Critic runs on Perl 5.10.1 and later and relies on PPI. Its flexibility is valuable for teams with explicit standards, but it also means you need to choose policies and configure how strictly to apply them. It is free and open source.
Rank #2
- Used Book in Good Condition
2. Perltidy: best for consistent formatting
Perltidy reformats and indents Perl scripts to make them easier to read. It is a formatter, not a policy analyzer: use it to make layout consistent, not to decide whether code follows a team’s broader design or safety rules.
Formatting and integration
Perltidy accepts command-line formatting options, and its defaults approximately follow suggestions in the Perl Style Guide. Its documentation describes installation through CPAN and integration with tools such as tidyall. A consistent formatter can reduce style-only review debate and make code changes easier to scan, though formatting may create substantial diffs if applied to a file or project all at once.
The project documentation says Perltidy can help locate missing or extra braces, parentheses, and square brackets. That limited error-localization aid does not make it a substitute for syntax checking or static policy analysis.
Compatibility and license
The project says Perltidy should run on Perl 5.8.1 or later and identifies it as free software under the GNU General Public License.
Rank #4
3. zarn: an option to investigate for security analysis
zarn is described by the analysis-tools.dev directory as a lightweight static security-analysis tool for modern Perl applications. A LinuxLinks roundup snippet also characterizes it as analyzing source code and dependencies. This makes it a candidate to investigate when security-oriented static analysis is your goal, rather than a replacement for formatting or general coding-policy checks.
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The available descriptions do not establish which vulnerability classes it detects, its supported Perl versions, how actively it is maintained, or its release history. Check the project’s current documentation and verify that its checks fit your application before relying on it as part of a security process.
Best Value
4. Perl Language Server (PLS): best for editor feedback
Perl Language Server, also called PLS in its repository, implements Language Server Protocol features for Perl 5. Its documented features include navigation to definitions, symbols, hover documentation, signature help, completion, formatting, range formatting, syntax checking, import sorting, and linting via Perl::Critic.
Linting is an integration, not a separate engine
The repository’s setup documentation says Perl::Critic integration is off by default in the described configuration; its configuration example shows how to enable it. PLS therefore provides an editor workflow around underlying tools rather than replacing Perl::Critic with a distinct policy engine. The repository documents setup routes for VS Code, Neovim, BBEdit, and Emacs LSP Mode.
A roundup search result uses the label “perl-lsp,” but the reviewed repository calls its project Perl Language Server and PLS. The available information does not confirm that this repository is the exact project intended by every use of “perl-lsp,” so check the project identity and instructions for your editor before installing.
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- Choose Perl::Critic if you want configurable coding-policy checks from a command line, test suite, or build.
- Add Perltidy if your separate goal is predictable indentation and formatting.
- Investigate zarn if you need security-focused static analysis, after verifying its current checks and project status.
- Use PLS with Perl::Critic if you want lint diagnostics in an editor and are prepared to configure the integration.
For a team standard, compare each tool by the job it performs, how much control you have over its rules or style, where its feedback appears, and the setup it requires. In particular, editor linting through PLS depends on Perl::Critic and is not enabled by default in the documented setup. This is a role-based recommendation, not a performance ranking or benchmark.
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