Developer Tools
Log Prettifier
Paste raw JSON log output and get human-readable, formatted log entries in seconds. Extracts level, timestamp, message, and structured data, transforming walls of minified JSON into readable logs.
Features
- Formats JSON log lines with indentation
- Highlights log level (ERROR, WARN, INFO, DEBUG)
- Extracts timestamp and message prominently
- Handles concatenated JSON log streams
- Copy or download formatted output
How to use it
- Paste your raw log output.
- Formatted log entries appear instantly.
- Copy the output for sharing or analysis.
Use cases
- Debugging production logs from cloud functions
- Reading structured logs from Node.js, Python, or Go services
- Sharing readable logs in incident reports
Limitations
- JSON lines are pretty-printed and plain logs are kept readable.
- Very large input can be slower on older devices.
- This utility is designed for common snippets and local inspection, not as a full security or language-specific validator.
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Use toolFrequently asked
Does it work with multi-line logs?
Yes. The tool handles both single-line JSON objects and newline-delimited JSON (NDJSON) streams.
Does Log Prettifier upload my input?
Your file or text is processed in your browser and is not uploaded.
What does Log Prettifier output?
It outputs readable log output. JSON lines are pretty-printed and plain logs are kept readable.
Should I review Log Prettifier output before using it?
Yes. Developer formats and snippets can be context-sensitive, so review generated output before using it in production.