TL;DR: replace
/with\u2215.
Problem
In Node.js, when writing to a filename with a trailing slash (/), it gets evaluated as a directory path.
Example
Writing to the filename try/catch.txt:
const filename = 'try/catch.txt';
require('fs').writeFileSync(filename);
Throws the error:
Error: ENOENT: no such file or directory, open 'try/catch.txt'
Solution
To write to a filename with a trailing slash, replace the / with the Unicode equivalent \u2215:
const filename = 'try/catch.txt'.replace('/', '\u2215');
require('fs').writeFileSync(filename);
To replace all trailing slashes with the Unicode equivalent:
const filename = 'try/catch/finally.txt'.replace(/\//g, '\u2215');
require('fs').writeFileSync(filename);