[SOLVED] Nodejs check if the given string is a valid file system path without actually checking the file system

Nodejs check if the given string is a valid file system path without actually checking the file system

How in nodejs can I check if the given string is a valid filesystem path without actually checking the filesystem.

I am using telegram bot nodejs api and when sending files it checks if the file exist or not. But on the second time I am using the telegram file id that i got from the previews upload and not the actual file path to send the file, so in this case i want to check if the string is a actual file path and not a file id(exp: AgADBAADuqcxG-ysuwhqkRaOdVnJI0CZXhkABL1NBSyVlK3gduoAAgI) before checking if file exist so to increase performance and avoid unnecessary file system access.

Solution

You could check if the string equals path.basename(string). Then it doesn't contain any path separators and is definitely not a file in another directory. That function doesn't touch the filesystem and only inspects the string for platform's specific directory separator, and hence suits your performance needs.
```
 string === path.basename(string)
```
Another idea: if the identifiers follow a specific format, then create a regexp for the format and test each string for a match and proceed accordingly.
```
 /identifierregex/.test(string)
```