Buffer to string conversion in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Buffer in Node.js?

A Buffer is a special object in Node.js used to store raw binary data. It helps handle data like files or network packets before converting them to strings or other formats.

beginner

How do you convert a Buffer to a string in Node.js?

Use the toString() method on the Buffer object. For example: buffer.toString() converts the buffer's binary data into a readable string.

beginner

What encoding does buffer.toString() use by default?

By default, buffer.toString() uses UTF-8 encoding to convert the binary data into a string.

intermediate

How can you convert only part of a Buffer to a string?

You can pass start and end positions to toString(), like buffer.toString('utf8', start, end). This converts only the bytes between start and end to a string.

intermediate

Why might you need to specify encoding when converting a Buffer to a string?

Different data might use different encodings like UTF-8, ASCII, or Base64. Specifying encoding ensures the Buffer converts correctly to the intended string format.

What method converts a Node.js Buffer to a string?

A toString()

B toBuffer()

C convert()

D stringify()

The toString() method converts a Buffer's binary data into a string.

What is the default encoding used by buffer.toString()?

A ASCII

B UTF-8

C Base64

D UTF-16

UTF-8 is the default encoding for buffer.toString().

How do you convert only a part of a Buffer to a string?

A buffer.slice(start, end).toString()

B buffer.toString(start, end)

C buffer.toString('utf8', start, end)

D buffer.convert(start, end)

You specify encoding and byte positions like buffer.toString('utf8', start, end) to convert part of a Buffer.

Which of these is NOT a valid encoding option for Buffer to string conversion?

A utf8

B ascii

C binary

D json

'json' is not a valid encoding for Buffer conversion; common encodings include 'utf8', 'ascii', and 'binary'.

Why might you convert a Buffer to a string in Node.js?

A To read binary data as human-readable text

B To increase Buffer size

C To encrypt data

D To create a new Buffer

Converting a Buffer to a string lets you read or display the binary data as text.

Explain how to convert a Node.js Buffer to a string and why encoding matters.

Think about how raw data becomes readable text.

Describe how to convert only a part of a Buffer to a string in Node.js.

Partial conversion helps when you want a slice of data.