Sending JSON data through an HTTP POST request using Arduino

I am attempting to send JSON data using an Arduino. When running this code, I attempt to send the JSON data with a QueryString parameter. However, when I try this code, the server responds with a message stating that the QueryString format is incorrect, indicating that I am successfully connected to the server and it has received my data.

 if (client.connect(server, 80)) {
Serial.println("connected");
// Make a HTTP request:
client.println("POST /URL?query=jsondata HTTP/1.1");
client.println("Host: **.**.**.**");
client.println("Connection: close\r\nContent-Type: application/x-www-form-urlencoded");
client.print("Content-Length: ");
client.println(PostData.length());
client.println();
client.println(PostData);

}

However, my primary objective is to send the JSON data with a QueryString parameter. When I try the following code;

client.println("POST /URL?query={request:{Header:{Username:kullaniciAdi,Password:123456},Item:{Serial:ABC123QWE,Data:100, DateOn:23/11/1986 15:45:24}}} HTTP/1.1");

I receive a HTTP Error 400, indicating that the request is malformed. Does anyone have any ideas on how to resolve this issue?

jsonpostarduinohttp-post

Answer №1

A void, your URL has spaces and possibly other characters that can throw off the structure of a post request. It's important to encode these characters.

From what I've discovered, it seems that the standard Arduino libraries don't have a built-in urlEncode function like many other programming languages and libraries do. You'll either need to create one yourself or seek out an existing solution.

Here's an example of how your code might look:

String request = "/URL?query={request:{Header:{Username:kullaniciAdi,Password:123456},Item:{Serial:ABC123QWE,Data:100, DateOn:23/11/1986 15:45:24}}}";
String encRequest = uriEncode(request); // you'll need to implement your own encoding method for this...
String post = "POST " + encRequest + " HTTP/1.1");
client.println( post);

You can find some helpful discussions on creating a uriEncode function on the Arduino Forum, and there's also a useful method outlined on hardwarefun.com.

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