Log Viewer & Log File Analyzer for VS Code
Open log files of any size in VS Code and find the line that matters. A 2 GB log opens in seconds because the file is indexed by streaming and only the lines on screen are read. Levels are colored, stack traces stay with their error, and the view follows the file as it grows.
Free, with no limits
- Large files: GB logs open fast, scroll smoothly and never load into memory. Lines up to 64 KB show in full.
- Levels in color: error, warning, info, debug and trace from plain text, JSON (
"level", pino and bunyan numbers), syslog priorities and Android logcat. Chips with counts show or hide each level; Alt+click shows only one.
- Timestamps detected in ISO 8601, syslog, Apache, logcat, Log4j, HDFS, Spark and JSON fields (
time, ts, @timestamp, epoch ms).
- Filter by text or
/regex/, match case, and a time range like 10:00 to 10:30 or -15m. A match inside a stack trace keeps the whole entry.
- Follow mode like
tail -f: new lines appear as the file grows. Rotated or truncated files are read again.
- Go to a time or a line number, newest first, and a detail pane that shows the whole entry or a JSON line as pretty JSON.
- Opens
.log, .log.1 and friends by default; any other file with Open in Log Viewer. Open as text is one click away.
Zovo Pro: USD 19 once. One purchase turns on the Pro tools in every Zovo extension. Each tool here has 3 free tries first:
- Find patterns and error spikes: similar lines grouped into patterns with counts (numbers, ids, times and addresses masked), and the minutes where errors spiked.
- Merge log files by time: several services, nodes or rotated files in one timeline, each line tagged with its file.
- Export filtered lines: the current view as CSV, JSON Lines or a plain log file.
Privacy
Log Viewer reads your file and nothing else. It makes no network calls and has no telemetry. Pattern reports and exports are written only where you choose.
Limits in this version
- Files are read as UTF-8. UTF-16 logs (some Windows tools) show as garbled text.
- Lines longer than 64 KB are cut in the view, not in the file.
- Formats without a year (syslog, logcat) take the year the file was last written.
- The index takes about 22 bytes of memory per line, so 50 million lines need about 1.1 GB. The limit is the setting
zovoLog.maxLines.
- Local files only (including Remote SSH and WSL folders). Virtual file systems are not supported.
Support Zovo
Zovo Pro: USD 19 once, every Zovo viewer. Get Zovo Pro on GitHub Sponsors to turn on the Pro tools in this extension and in the other Zovo extensions you use. The free features stay free.
Zovo extensions have no ads and no tracking. They are made by theluckystrike on GitHub. You can also support the work with no Pro:
Open a format request with a sample file, and I reply there whether it can be done. For USD 299 once, through this GitHub Sponsors tier, I add your file format or a missing feature to this extension, with tests, within 7 days.
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- XLSX Viewer, Excel Viewer, CSV Viewer & Parquet Viewer (XLS, CSV Preview) opens CSV, TSV, Excel and Parquet files as a sortable, filterable table.
- DOCX Viewer & ODT Viewer, Word Document Preview (Dark Mode) previews Word and ODT files with dark mode, an outline and search.
See all Zovo extensions on the Marketplace.
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