Text Deduplication Tool

Text Deduplication Tool Instructions

Features

• High Performance: Implemented using JavaScript's Set (Hash Set) data structure, the time complexity is O(N). It can deduplicate massive log files with hundreds of thousands of lines in milliseconds.
• Trim Spaces: Enabled by default. Often, an invisible space at the end of a line causes it to be treated as a different line. With this enabled, "abc " and "abc" will be recognized as duplicates.
• Ignore Case: When enabled, "Apple" and "apple" will be treated as the same item and merged (retaining the format of the first occurrence).
• Remove Empty Lines: Enabled by default. Automatically cleans up blank lines and line breaks in the original text, making the output more compact.

Application Scenarios

• Data Cleaning: Clean duplicate data in user email lists, phone number lists, or ID lists exported from a database.
• Log Troubleshooting: Extract unique IP addresses appearing in Nginx or Apache logs (deduplicate massive access logs to see only which unique IPs have visited).
• Crawler Post-processing: Link collections and keyword sets scraped from web pages often have a lot of redundancy. Use this tool to instantly obtain a Unique Set.