How to parse json string recived from pyserial?

Question

I use the pyserial library to get data from an Arduino. I use the fallowing code:

import serial
import JSON

ser = serial.Serial('/dev/ttyUSB0', 9600)
while True:
    print(ser.readline())

When I run the program I get: b'{"x":"-1","y":"0"}\r\n' but I expect {"x":"-1","y":"0"}.

I know that I can remove \r\n by using stipe() method on ser,redline(). I also noticed that b' is from bytes.

When I try load string to json by command data = json.load(ser.readline().strip()) I get an error AttributeError: 'bytes' object has no attribute 'read'

How can I parse the string to json format?

`json.load()` is for reading data from a file. Use `json.loads()` to read from an existing string. — jasonharper, May 24 '17 at 16:37
This is a duplicate of https://stackoverflow.com/questions/606191/convert-bytes-to-a-python-string — Roshi, May 24 '17 at 16:37
@Roshi I agree that the merits of the question is duplicate but the context (which is important) isn't even similar. — trojek, May 24 '17 at 16:50
json.loads() returns: "UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfb in position 0: invalid start byte" — trojek, May 24 '17 at 19:38

score 2 · Accepted Answer · answered May 24 '17 at 16:37

2

using your_line.decode('utf-8') to decode your line

answered May 24 '17 at 16:37

Haifeng Zhang

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How to parse json string recived from pyserial?

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