Node.js filehandle.readFile() Method
The filehandle.readFile() method is used to asynchronously read the file contents. This method reads the entire file into the buffer. It Asynchronously reads the entire contents of a file.
Syntax:
filehandle.readFile( options )
Parameters: The method accepts single parameter as mentioned above and described below:
- options: It holds the encoding of file. Its default value is ‘utf8’. It is an object or a string.
- encoding: It is a String or NULL. Default: null
Return Value: It returns a Promise.
- The Promise is resolved with the contents of the file. If no encoding is specified using options.encoding, the data is returned as a Buffer object. Otherwise, the data will be a string.
- If options is a string, then it specifies the encoding.
- The FileHandle has to support reading.
Example: Read the file contents of the file ‘GFG.txt’
Note: ‘GFG.txt’ should be present in the directory with the following text:
GeeksforGeeks - A computer science portal for geeks
Filename: app.js
const fs = require( 'fs' );
const fsPromises = fs.promises;
async function doReadFile() {
let filehandle = null ;
try {
filehandle =
await fsPromises.open( 'GFG.txt' , 'r+' );
var data =
await filehandle.readFile( "utf8" );
console.log(data);
} catch (e) {
console.log( "Error" , e);
}
}
doReadFile(). catch ((error) => {
console.log( "Error" , error)
});
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Run app.js file using the following command:
node app.js
Output:
GeeksforGeeks - A computer science portal for geeks
Reference: https://nodejs.org/dist/latest-v14.x/docs/api/fs.html#fs_filehandle_readfile_options
Last Updated :
08 Oct, 2021
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