sevdokimov/log-viewer — reverse-engineered prompt

Build me a web log viewer that runs locally in the browser and lets me watch server log files in real time. I want to open a log file from a file chooser, or by pasting a direct URL with the file path, then scroll around without loading the whole file into memory.

Make the UI good for developers reading messy logs. It should highlight log levels, dates, threads, logger names, brackets, and stack traces. Add search, filters for level, logger, date, thread, and a way to type a custom JavaScript condition for advanced filtering. Let me collapse noisy parts like long package names and less important stack trace lines.

It should also be able to combine several log files into one timeline when they have full timestamps, even if they come from different running instances. Add shareable links to the current log position. Include a simple config file for allowed files, shortcuts, and custom log formats. Java is fine, and Spring Boot support would be useful.