http POST of JSON data to remote server

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http POST of JSON data to remote server #480471
06/08/20 16:08 06/08/20 16:08

Joined: May 2018
Posts: 136

SBGuy

OP
Member

SBGuy

OP
Member

Joined: May 2018
Posts: 136

I'm trying to post a simple JSON to a remote server. The command line curl test works, but I can't seem to properly format my JSON string in the data variable for an http_post or http_send call. Any idea where my mistake is? I've tried both single quote and escaped double quotes.

Thanks!

Code

	string data = "{\
		\"apikey\":\"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\", \
		\"systemid\":\"129392723\", \
		\"signal\":{ \
			\"action\":\"BTO\", \
			\"quant\": 3, \
			\"symbol\":\"AAPL\", \
			\"typeofsymbol\":\"stock\", \
			\"market\": 1, \
			\"duration\":\"DAY\" \
		} \
	}";

	int id = http_post(URL, data);



*************** server response *********************

{
   "ok" : "0",
   "error" : {
      "title" : "Invalid JSON",
      "message" : "\"':' expected, at character offset 1 (before \\\"\\\\\\\\r\\\\n\\\\t\\\\t\\\"apikey\\\":\\\"6...\\\")\\n\""
   }
}

Last edited by SBGuy; 06/08/20 16:33.

Re: http POST of JSON data to remote server [Re: SBGuy] #480472 06/08/20 16:42 06/08/20 16:42
Joined: May 2018 Posts: 136 S SBGuy OP Member
SBGuy OP Member S Joined: May 2018 Posts: 136	Solved!!! Apparently the line continuation backslash is the problem. I supposed if I used some json library I wouldn't have this problem, but it was a simple POST so I didn't bother.

Re: http POST of JSON data to remote server [Re: SBGuy] #480474 06/08/20 17:38 06/08/20 17:38
Joined: May 2020 Posts: 9 Ireland O onoff Newbie
onoff Newbie O Joined: May 2020 Posts: 9 Ireland	I highly recommend Postman for building and testing remote calls to APIs and whatnot...

Re: http POST of JSON data to remote server [Re: SBGuy] #480475 06/08/20 17:47 06/08/20 17:47
Joined: Feb 2017 Posts: 1,806 Chicago AndrewAMD Serious User
AndrewAMD Serious User Joined: Feb 2017 Posts: 1,806 Chicago	Originally Posted by SBGuy I supposed if I used some json library I wouldn't have this problem, but it was a simple POST so I didn't bother. Generating json from scratch is easy. It's parsing json which is a bit more tedious and might justify the use of a library. In my blog, I use jsmn as a library to parse json in Zorro: https://www.vitaltrades.com/2019/01...sing-zorro-script-part-2-parse-any-json/ You also have the option of loading a json file directly so that you don't have to intermix C and json so much. www.vitaltrades.com - andrew@vitaltrades.com

Moderated by Petra