LCOV Viewer

A precise tool that analyzes LCOV/Istanbul coverage data to produce per-file and overall coverage metrics for developers, QA engineers, and CI pipelines.

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1,600+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

This tool ingests a raw LCOV trace (lcov_text) and computes coverage metrics. It supports Istanbul-style reports and can filter by file path using a regex. It outputs a structured model with overall coverage and per-file details suitable for CI dashboards and QA reviews. Example LCOV fragment: SF:path/to/file.js\nDA:1,0\nDA:2,1\nend_of_record.
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It computes coverage for lines and optionally branches; If branch data present BRF/BRH, branch coverage is computed. The tool can emit per-file metrics and a total summary, with optional sorting and file filtering.
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The audience includes developers, QA engineers, and CI teams needing reproducible metrics from textual reports, without UI noise. Its value lies in precise LCOV compatibility, optional file filtering, deterministic gating, and easy integration into automation. Core features include parsing, per-file aggregation, overall calculation, and structured JSON output for downstream tooling.

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How to Use

Provide lcov_text containing LCOV trace.
Configure optional inputs: min_coverage_threshold, filter_regex, sort_by.
Run calculation to produce overall_coverage and per-file details.
Review per-file results and identify low-coverage files.
Export or integrate the results into CI dashboards or reports.

Frequently Asked Questions

Find Quick Answers

What formats are supported?

Only LCOV text traces are parsed. The tool does not interpret Cobertura, JaCoCo, or binary coverage formats. If your data is in another format, pre-convert to LCOV text before analysis.

How is overall coverage calculated?

Overall coverage is a weighted average of line coverage across all files: total_lines_covered divided by total_lines. If branch data exists, branch coverage can be reported separately. The calculation uses exact counts from the LCOV input.

Can I filter files?

Yes. Provide filter_regex to include only files whose path matches the pattern. Filtering affects both the totals and the per-file results; files not matching the pattern are excluded from the overall calculation.

What happens on malformed input?

If lcov_text is missing or contains invalid lines, the parser returns zero or partial results and reports non-fatal diagnostics in internal logs. The tool does not crash and provides the best possible totals given valid segments.

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