Free, browser-based utilities for everyday developer workflows

JSON Lines / Log Viewer

Parse NDJSON and mixed logs with embedded JSON, then filter, normalize, and inspect structured entries without sending data anywhere.

  • Handles JSON Lines, NDJSON, and mixed logs containing JSON fragments.
  • Filter entries by search text and export normalized output.
  • Inspect a selected entry in pretty JSON form.

Use cases

Analyze JSONL / NDJSON Log Lines

Explore more in the Use cases library.

Log input

Summary

Total lines-
Parsed entries-
Errors-
Visible-

Entries

Selected entry

Normalized output

How to use JSON Lines / Log Viewer

Paste your log lines into the input and click Parse logs. The tool extracts JSON objects from each line, shows a compact list view, and produces normalized output as either a pretty JSON array, NDJSON, or messages only.

Common use cases

Developers use this to inspect app logs with embedded JSON, SDETs use it to debug test-run traces, and analysts use it to turn JSONL exports into a cleaner structure before filtering or further transformation.

Why run this in your browser?

All processing happens locally in your browser. Your logs stay on your machine, which is useful when they contain internal IDs, request metadata, or production-like payloads.