Console Log Viewer - Online Simulate & Format Output

A Console Log Viewer is an online tool that simulates the browser's developer console, allowing you to create, format, and display log messages as they would appear in Chrome DevTools or similar environments. It supports multiple log levels (log, info, warn, error, debug) and can automatically detect and format JSON data for better readability. This tool is ideal for developers who want to test log formatting, create documentation screenshots, or demonstrate console output behavior without opening browser developer tools.

This Console Log Viewer supports all five standard console methods: console.log (standard output, gray indicator), console.info (informational messages, blue indicator), console.warn (warnings, yellow/orange indicator with highlighted background), console.error (errors, red indicator with highlighted background), and console.debug (debug-level messages, muted gray indicator). Each level is visually distinct, closely mimicking how they appear in Chrome DevTools.

Yes! The tool includes automatic JSON detection. When you paste a valid JSON string or object into the message input, the tool recognizes it and offers a "Format JSON" button. The formatted output appears in the simulated console with proper indentation, making complex nested objects and arrays easy to read. You can also toggle between raw text display and formatted JSON display for each log entry.

You can export all displayed logs by clicking the Export button in the toolbar. This generates a plain text file (.txt) containing all log entries with their timestamps, log levels, and messages. The export preserves the chronological order and formatting, making it suitable for sharing with team members, attaching to bug reports, or archiving for documentation purposes.

Yes, completely free. This Console Log Viewer is a free online tool with no registration, no paywalls, and no usage limits. You can generate as many log entries as you need, export them, and use the tool for personal or professional purposes without any cost. It runs entirely in your browser with no data sent to any server.

While browser DevTools shows actual runtime console output from your code, this simulator allows you to manually craft and preview log messages without executing any JavaScript. This is especially useful for: creating educational content about console methods, designing consistent log formats for your applications, generating clean console screenshots for documentation, and testing how different data structures look when logged. It complements DevTools rather than replacing it.

Yes, timestamps are enabled by default. Each log entry displays a precise timestamp in HH:MM:SS.mmm format (hours, minutes, seconds, and milliseconds). You can toggle timestamps on or off using the Timestamps button in the toolbar. When timestamps are enabled, they appear on the left side of each log entry in the simulated console, just like in Chrome DevTools.

Absolutely. The tool provides both type-based filtering (you can show only errors, only warnings, only logs, etc.) and a keyword search input that filters logs in real-time as you type. You can combine both filters to narrow down specific entries. The filter status indicator shows how many logs match your current criteria out of the total.