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Detect duplicate code before merge.

See how duplicate code fits local review, which evidence Code Radar produces, where coverage ends, and how trusted findings move into CI.

Check this risk locallyReview detection evidence
radar scan . --quick

What duplicate code means here.

The duplicate code rule identifies review patterns that can create exploitable behavior or hide material maintenance risk, then returns the affected location, severity, confidence, and remediation context.

Rule reference

Evidence to inspect

Use “Detect duplicate code before merge.” as the scope for this decision: verify the input, finding detail, workflow handoff, and product boundary before you install or buy.

CriterionEvidence to inspectBoundary
Input scopeSelected files, configuration, scan mode, and enabled rules.Only included paths and configured checks are evaluated.
Finding detailFile, line, rule ID, severity, explanation, and repair direction.Illustrative output is not a result from your repository.
Workflow handoffLocal result, report format, agent context, and optional CI signal.Enable exports or CI only when the workflow needs them.
Decision fitUse the same criteria on a real repository before choosing a plan or tool.No universal winner or guaranteed outcome is claimed.
Rule reference

Check this risk locally

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Coverage and concrete signals

Detect copied validation or business logic that increases review and repair cost.

  • Audience: Developers and reviewers deciding how to handle duplicate code findings before merge.
  • Evidence to inspect before you trust the result.: Compare the repeated locations, the shared behavior, and the smallest extraction that preserves validation or business rules.
  • Boundary: Generated code, fixtures, and deliberately separate adapters can be intentional duplicates; document that context before suppressing and refactor only when behavior is shared.
  • Rule ID: RADAR-HEALTH-DUPLICATE
Feature: code health scannerChoose the next page that matches the remaining implementation or evaluation step.Benchmarks: benchmarksChoose the next page that matches the remaining implementation or evaluation step.Docs: rulesChoose the next page that matches the remaining implementation or evaluation step.

Risky pattern / Safer pattern

duplicate code: A useful result must be explainable to a developer and portable to the next review surface. Inspect the concrete evidence below before changing team policy.

Risky patternSafer pattern
function repeatedValidation() { /* copied logic */ }function validateInput() { /* shared, reviewed logic */ }

From local signal to shared gate.

duplicate code: Use the smallest workflow that proves value. Each later step should reuse evidence the team already understands. Compare the repeated locations, the shared behavior, and the smallest extraction that preserves validation or business rules.

StepCommand or actionDecision
1Run a quick local scanIs the signal useful?
2Inspect and repair findingsIs the fix specific and reproducible?
3Export portable evidenceDoes the reviewer need SARIF, JSON, or HTML?
4Promote the trusted threshold to CIWhich severity should block a pull request?
radar scan . --quick
radar scan . --format sarif --fail-on high
Official source

Primary sources

Rule reference

Start with the problem you need to solve.

Open page →
Local SASTLocal SAST for Developers and CIProofSee sample reportInstallInstall Radar

Validate the workflow on your own code.

Apply this page’s evidence to one real repository. For “Detect duplicate code before merge.”, confirm which finding is produced, whether the proposed next step is reproducible, and where local scanning, reports, agents, or CI should stop or expand.

Check this risk locallyReview detection evidence