In a nutshell, what I want is for a javascript function to check a file for an HTML input.
I have tried using doing as this post told me to: Javascript check if (txt) file contains string/variable
But kept getting an error saying ReferenceError: fs is not defined
So now I am here asking for help.
2 Answers
I cannot be sure because you didn't provide any example code, but fs usually refers to "file system" in nodejs
So the answer from the other topic isn't complete but the import is implied by it's usage:
var fs = require("fs")
fs.readFile(FILE_LOCATION, function (err, data) {
if (err) throw err;
if(data.indexOf('search string') >= 0){
console.log(data)
}
});But like some other commentors have said, this is for nodejs and not in the browser.
3 Comments
ray
data.includes answers the question more directly than
indexOf and might be more performant.
Marc
@rayhatfield searching for a string in a file (txt file as example) not a string in a string.
ray
@KaidenSmith I'm referring to his use of
indexOf in the callback, where data is a string or buffer, both of which support includes.If you're trying to do this in a browser, you could fetch the url and use includes to check for the string you're looking for:
async function responseContains(url, string) {
try {
const content = await fetch(url).then(response => response.text());
return content.includes(string);
}
catch (e) {
console.log(e);
throw e;
}
}
const url = 'https://jsonplaceholder.typicode.com/todos/1';
/*
the url above returns:
{
"userId": 1,
"id": 1,
"title": "delectus aut autem",
"completed": false
}
*/
responseContains(url, 'userId')
.then(found => console.log(`Found 'userId'? ${found}`));
// Found? true
responseContains(url, 'wookies with bananas')
.then(found => console.log(`Found 'wookies with bananas'? ${found}`));
// Found? false
const fs = require('fs');