how to use pjf fuzz a json parse binary ?

[greyd0g]

i am learning fuzz. when i try use pjf to fuzz pjf.
[~/fuzz]$ pjf --P "./jq" -p "-r ."
Starting PyJFuzz - Mobile Security Lab 2016

---

| __ \ | | |
| |) | _ | | | _ _ ________
| / | | | | | | | | | / /
| | | || | |_| | | | || |/ / / /
|| _, |_/|| _,//| v1.1.2
/ |
|/

Author: Daniele 'dzonerzy' Linguaglossa
Mail: d.linguaglossa@mseclab.com

[ERROR]: 'bool' object has no attribute 'getitem'.

what happend?

[docfate111]

I am trying to fuzz a binary https://github.com/amzn/ion-c. Is there a way to fuzz into a file and then run the ./jsonparser on the file?

[docfate111]

pjf --auto --no-logo > f
while [ $? -eq 0 ]; do
      echo "fuzzing"
      pjf --auto --no-logo > f
     ./jsonparsebyargument f
done
echo "found crash"

This is the script I am using now. Is there a built-in feature that does this?