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Base64 encode JSON

const valueEncoded = Buffer.from(JSON.stringify(value), 'base64')

Creating a Buffer object

There are 2 ways to create a buffer object:

1. Create a new buffer object, allocating the size during instantiation
2. Extract a buffer from existing data

Create new buffer

If you are going to store data in memory that you have yet to receive, you’ll want to create a new buffer with Buffer.alloc(1024)

When creating a new buffer with alloc(), it is filled by default with binary zeroes to serve as a placeholder.

Extract a buffer

To create a buffer from pre-existing data, we use Buffer.from() we can create buffers from:

• array of integers (between 0 and 255)
• an ArrayBuffer object, which stored a fixed length of bytes
• a string
• another Buffer

Reading from a Buffer object

We can access an individual byte in a buffer or we can extract the entire contents.

• To access one byte of a buffer, we pass the index or location of the byte we want. Buffers store data sequentially like arrays. They also index their data like arrays, starting at 0. We can use array notation on the buffer object to get an individual byte.

The buffer object comes with the toString() and the toJSON() methods, which return the entire contents of a buffer in two different formats.

Modify a Buffer

You can either modify buffer bytes individually using the array syntax, or write new contents to the buffer, replacing the existing data.

E Resources

https://www.digitalocean.com/community/tutorials/using-buffers-in-node-js