How to Convert Markdown to HTML using C/C++

Markdown is designed to make web content easier to write and read within web-based applications. Our applications still need a way to convert Markdown to HTML, however. Thankfully, the below code makes that part easy.

We can use the below C/C++ examples to structure an API call that quickly converts Markdown text content to HTML, and we can use this service for free with a free-tier API key (up to 800 API calls per month).

We’ll just need to first install libcurl in our C/C++ project:

libcurl/7.75.0

And after that we can structure our request like so, copying our API key into the authorization header:

CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
     curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
     curl_easy_setopt(curl, CURLOPT_URL, "https://api.cloudmersive.com/convert/web/md/to/html");
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
     curl_easy_setopt(curl, CURLOPT_DEFAULT_PROTOCOL, "https");
     struct curl_slist *headers = NULL;
     headers = curl_slist_append(headers, "Content-Type: multipart/form-data");
     headers = curl_slist_append(headers, "Apikey: YOUR-API-KEY-HERE");
     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
     curl_mime *mime;
     curl_mimepart *part;
     mime = curl_mime_init(curl);
     part = curl_mime_addpart(mime);
     curl_mime_name(part, "inputFile");
     curl_mime_filedata(part, "/path/to/file");
     curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
     res = curl_easy_perform(curl);
     curl_mime_free(mime);
}
curl_easy_cleanup(curl);

Just like that, we’re all done — no more code required.