(Node.js) curl POST with JSON Input and JSON Output

See more CURL Examples

Note: This example requires Chilkat v11.5.0 or greater.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var success = false;

    // Run the following curl command

    //  curl -X POST https://httpbin.org/post \
    //       -H "Content-Type: application/json" \
    //       -d '{
    //             "title": "foo",
    //             "body": "bar",
    //             "userId": 1
    //           }'

    // The backslashes at the end of lines are not required.  Chilkat ignores them if present.
    var sbTargetCurl = new chilkat.StringBuilder();
    sbTargetCurl.AppendLn(" curl -X POST https://httpbin.org/post \\");
    sbTargetCurl.AppendLn("      -H \"Content-Type: application/json\" \\");
    sbTargetCurl.AppendLn("      -d '{");
    sbTargetCurl.AppendLn("            \"title\": \"foo\",");
    sbTargetCurl.AppendLn("            \"body\": \"bar\",");
    sbTargetCurl.AppendLn("            \"userId\": 1");
    sbTargetCurl.AppendLn("          }'");

    var httpCurl = new chilkat.HttpCurl();

    // Run the curl command.
    success = httpCurl.DoYourThing(sbTargetCurl.GetAsString());
    if (success == false) {
        console.log(httpCurl.LastErrorText);
        return;
    }

    var responseJson = new chilkat.JsonObject();
    responseJson.EmitCompact = false;

    httpCurl.GetResponseJson(responseJson);

    var statusCode = httpCurl.StatusCode;
    console.log("response status code: " + statusCode);

    console.log(responseJson.Emit());

    // Output:

    // response status code: 200
    // {
    //   "args": {},
    //   "data": "{\r\n            \"title\": \"foo\",\r\n            \"body\": \"bar\",\r\n            \"userId\": 1\r\n          }",
    //   "files": {},
    //   "form": {},
    //   "headers": {
    //     "Content-Length": "96",
    //     "Content-Type": "application/json",
    //     "Host": "httpbin.org",
    //     "X-Amzn-Trace-Id": "Root=1-69e8db8b-459b3bdf7b7a3bc749184968"
    //   },
    //   "json": {
    //     "body": "bar",
    //     "title": "foo",
    //     "userId": 1
    //   },
    //   "origin": "123.222.222.222",
    //   "url": "https://httpbin.org/post"
    // }

    // ----------------------------------------------------------------------------------
    // Another example:

    // curl -X POST https://postman-echo.com/post \
    //      -H "Content-Type: application/json" \
    //      -d '{"foo":"bar"}'

    var targetCurl = "curl -X POST https://postman-echo.com/post -H \"Content-Type: application/json\" -d '{\"foo\":\"bar\"}'";

    // Run the curl command.
    success = httpCurl.DoYourThing(targetCurl);
    if (success == false) {
        console.log(httpCurl.LastErrorText);
        return;
    }

    httpCurl.GetResponseJson(responseJson);

    statusCode = httpCurl.StatusCode;
    console.log("response status code: " + statusCode);

    console.log(responseJson.Emit());

    // Output:

    // response status code: 200
    // {
    //   "args": {},
    //   "data": {
    //     "foo": "bar"
    //   },
    //   "files": {},
    //   "form": {},
    //   "headers": {
    //     "host": "postman-echo.com",
    //     "content-length": "13",
    //     "content-type": "application/json",
    //     "x-forwarded-proto": "https",
    //     "accept-encoding": "gzip, br"
    //   },
    //   "json": {
    //     "foo": "bar"
    //   },
    //   "url": "https://postman-echo.com/post"
    // }

}

chilkatExample();