Runtxt.com A site about the collection of text processing tools, I hope to help you.
Complete set of common tools
Remove blank lines

Remove text blank lines online

Add characters to the left

Online text to add a string to the left of the line by line

Add characters to the right

Online text to add a string to the right of the line

JSON processing

Online Json parsing, validation, formatting, compression, editing, and conversion of Json and XML