Node.js | Buffer.toString() Method
The Buffer.toString() method is used to decode a buffer data to string according to the specified encoding type. The start and end offset is used to decode only particular subset of a buffer. If the byte sequence in the buffer data is not valid according to the provided encoding, then it is replaced by the default replacement character i.e. U+FFFD.
Buffer.toString( encoding, start, end )
Parameters: This method accept two parameters as mentioned above and described below:
- encoding: The format in which the buffer data characters has to be encoded. Its default value is ‘utf8’.
- start: The beginning index of the buffer data from which encoding has to be start. Its default value is 0.
- end: The last index of the buffer data up to which encoding has to be done. Its default value is Buffer.length.
Return Value: It returns decoded string from buffer to string according to specified character encoding.
abcde bcd 6162636465
Explanation: In the above example, we have declared a variable buffer with size of 5 and have filled with ASCII value from ‘a’ to ‘e’. Next, we have used toString() method without any parameters, that returns the string with default encoding style i.e. ‘UTF-8’ of complete buffer. On the next line, it returns the string with encoding style of ‘UTF-8’ from index 1 to 3 (here, 4 is excluded). At last, it returns the string representation with encoding style of ‘HEX’.
Note: The above program will compile and run by using the
node index.js command.