{"hello": "world"}
\x16\x00\x00\x00 \x02 hello\x00 \x06\x00\x00\x00 world\x00 \x00
(total: 22 bytes)
The first four bytes contain the total length as a 32-bit small-term integer.
\x16\x00\x00\x00 => That is 22 in decimal form.
Now comes the first element. The first byte gives the data type.
\x02 => This is a UTF-8 string.
Then the name of the first element appears as a string with a terminating zero.
hello\x00
Next comes the element data in the previously specified type, in this case a string. For scanning (so that you can skip quickly when you don't need them), the lines start at their length and end at zero.
\x06\x00\x00\x00 => This length is 6.
world\x00
Now come the next elements, if any. All this ends with a zero byte.
\x00
{"BSON": ["awesome", 5.05, 1986]}
\x31\x00\x00\x00 \x04 BSON\x00 \x26\x00\x00\x00 \x02 0\x00 \x08\x00\x00\x00 awesome\x00 \x01 1\x00 \x33\x33\x33\x33\x33\x33\x14\x40 \x10 2\x00 \xc2\x07\x00\x00 \x00 \x00
(total: 49 bytes, array: 38 bytes)
The first four bytes contain the total length as a 32-bit small-term integer.
\x31\x00\x00\x00 => This is 49 in decimal form.
Now comes the first element. The first byte gives the data type.
\x04 => This is an array.
Then the name of the first element appears as a string with a terminating zero.
BSON\x00
This is followed by element data in a previously defined type, in this case an array.
[Quote: “A document for an array is a normal BSON document with integers for keys starting at 0 (..)”]
For scanning, and because they themselves form a document, arrays begin with their length and end with zeros.
\x26\x00\x00\x00 => This is 38 in decimal form.
Now comes the first element of the array. The first byte gives the data type.
\x02 => This is a UTF-8 string.
Then the name of the first element of the array appears with the completion of a null value.
0\x00 => This key is 0.
Next comes the element data in the previously specified type, in this case a string. Lines begin with their length and end with zero.
\x08\x00\x00\x00 => length 8
awesome\x00
Now the second element of the array appears. The first byte gives the data type.
\x01 => This is a double floating point number.
Then the name of the second element of the array with zero completion appears.
1\x00 => This key is 1.
Next comes the item data in the previously specified type, in this case, a double floating point number.
\x33\x33\x33\x33\x33\x33\x14\x40 => This is 5.5.
Now comes the third element of the array. The first byte gives the data type.
\x10 => This is a 32-bit integer.
Then the name of the third element of the array with zero completion appears.
2\x00 => This key is 2.
Next comes the element data in the previously specified type, in this case a 32-bit integer.
\xc2\x07\x00\x00 => In 1986.
The array ends with a null byte.
\x00
All this ends with a zero byte.
\x00