I think the issue is we don’t know what is the value of “extract - extract’s text”. You can see in the error message that was complaining about a character in line 2. You may want to encode your value before using it in JSON.
for an example if your “extract - extract’s text” value is:
=> some value " some " value
quotes will break your json.
Note: If you can share the raw request and response (please paste it as text not as an image ) I can debug it for you.