JSON Log Viewer

JSON Log Viewer – Frequently Asked Questions (FAQ)

What is a JSON Log Viewer?

A JSON Log Viewer is a web-based tool that helps developers and system administrators view, organize, and analyze JSON log files in a readable format. It parses structured log entries (in JSON format), highlights log levels like info, warn, and error, and groups logs by time or categories.

Why should I use a JSON Log Viewer?

Manual inspection of raw logs is difficult and error-prone. A JSON Log Viewer lets you:

• Visualize logs with colors and formatting
• Filter and search logs instantly
• Group logs by time (hour/day)
• Export logs as CSV or Excel for reporting
• Simulate real-time log streams

What kind of log files are supported?

The tool supports any log file where each line is a valid JSON object, such as:

{"timestamp":"2025-07-10T10:00:00Z", "level":"error", "message":"Database failed"}

Supported file types:

• .log

• .json

• .txt

Can I load logs from a URL or API?

Yes! You can paste a URL that returns newline-delimited JSON logs. The tool will fetch and render them in a grouped format. Great for viewing logs from cloud-based services, APIs, or remote servers.

How are logs grouped and displayed?

Logs are automatically grouped by hour (e.g., 2025-07-10 14:00), making it easier to analyze events during specific time windows. Each group is collapsible, and logs are color-coded based on severity:

🔵 info

🟠 warn

🔴 error

Can I filter logs by keywords?

Yes! A built-in search bar lets you filter logs in real time. You can search by timestamp, log level, or any text in the message body.

How can I export logs to Excel or CSV?

With one click, you can:

• Export to Excel (.xlsx) – Ideal for business reporting, pivot tables, or dashboard tools.
• Export to CSV (.csv) – Easy to open in Google Sheets or use in automation tools.
• Exports include cleanly structured fields: timestamp, level, message.

Is there a limit to the number of logs I can view?

No strict limit, but performance may vary depending on your browser and device. For optimal performance, consider keeping log files under 10,000 entries.

Can I simulate real-time logs?

Yes. Use the “Simulate Stream” feature to generate real-time logs for testing. This helps developers see how the viewer performs under live conditions.

Is this JSON Log Viewer free to use?

Yes! This tool is 100% free, runs entirely in your browser (no server/backend), and does not store any data.

Is my log data secure?

Absolutely. All log processing happens locally in your browser. No logs are uploaded or shared unless you explicitly fetch from a public URL.