Node.js – Buffer Length
Node.js – Buffer Length – To get Buffer length in Node.js, use the methodBuffer.length .
Syntax
| Buffer.length |
Buffer.length returns the amount of memory allocated to the buffer in bytes.
length property of Buffer class is immutable.
Example – Buffer created from a string
Following is an example to the usage of Buffer.length method :
const buf = Buffer.from('welcome to learn node.js'); var len = buf.length console.log(len) |
$ node buffer-length.js 24 |
When buffer is created from the supplied string, it allocates those number of bytes as that of in the string, to the buffer.
Example – Buffer created using alloc() method
In the following example, buffer is allocated a specific number of bytes, and then data(not the size of buffer) is written to the buffer. We shall see what Buffer.length returns for this buffer.
const buf = Buffer.alloc(50); const bytesWritten = buf.write('welcome to learn node.js'); var len = buf.length console.log(len) |
$ node buffer-length.js 50 |
It does not matter how many bytes you have overwritten from the allocated memory of buffer, but Buffer.length always returns the number of bytes allocated to the Buffer.
Conclusion :
In this Node.js Tutorial, we have learnt to find the length of Buffer in Node.js.