> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://mailchimp.com/developer/transactional/api/templates/render/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://mailchimp.com/_mcp/server. # Render a template POST https://mandrillapp.com/api/1.4/templates/render Content-Type: application/json Injects content and merge variables into a template, returning the HTML that results. Reference: https://mailchimp.com/developer/transactional/api/templates/render ## Request ### Body (application/json) This endpoint expects a TemplatesRenderRequest. - `key` (string, required) — A valid Mandrill API key - `template_name` (string, required) — Immutable name or slug of a template that exists in the user's account - `template_content` (list of TemplateContent, required) — Array of template content to render - `merge_vars` (list of MergeVar, optional, nullable) — Optional merge variables to use for injecting merge field content ## Response ### 200 Success - `html` (string, required) — Rendered HTML as a string with content and merge variables injected ## Errors ### 401 Unauthorized Error Invalid or missing API key. - `status` (string, required) — Status of the response, typically "error" - `code` (enum, required) — Numeric error code - Allowed values: `401` - `name` (enum, required) — Machine-friendly error name - Allowed values: `Invalid_Key` - `message` (string, required) — Human-readable error message ### 404 Not Found Error Template not found - `status` (string, required) — Status of the response, typically "error" - `code` (integer, required) — Numeric error code - `name` (string, required) — Machine-friendly error name - `message` (string, required) — Human-readable error message ### 500 Internal Server Error An unexpected internal server error occurred. - `status` (string, required) — Status of the response, typically "error" - `code` (integer, required) — Numeric error code - `name` (string, required) — Machine-friendly error name - `message` (string, required) — Human-readable error message ## Types ### TemplateContent Content injection for template editable regions. Fields are optional to allow empty objects. - `name` (string, optional, nullable) — Name of the mc:edit editable region to inject into - `content` (string, optional, nullable) — Content to inject into the editable region ### MergeVar Merge variable for template content injection - `name` (string, optional) — Merge variable name (case-insensitive, may not start with _) - `content` (string, optional) — Content value for the merge variable ## Examples **Request** ```json { "key": "ONzNrsmbtNXoIKyfPmjnig", "template_name": "example-template", "template_content": [ { "name": "editable", "content": "content" } ], "merge_vars": [ { "name": "merge1", "content": "merge1 content" } ] } ``` **Response** ```json { "html": "
Rendered template content with merge variables
" } ``` **SDK Code** ```python import requests url = "https://mandrillapp.com/api/1.4/templates/render" payload = { "key": "ONzNrsmbtNXoIKyfPmjnig", "template_name": "example-template", "template_content": [ { "name": "editable", "content": "content" } ], "merge_vars": [ { "name": "merge1", "content": "merge1 content" } ] } headers = {"Content-Type": "application/json"} response = requests.post(url, json=payload, headers=headers) print(response.json()) ``` ```javascript const url = 'https://mandrillapp.com/api/1.4/templates/render'; const options = { method: 'POST', headers: {'Content-Type': 'application/json'}, body: '{"key":"ONzNrsmbtNXoIKyfPmjnig","template_name":"example-template","template_content":[{"name":"editable","content":"content"}],"merge_vars":[{"name":"merge1","content":"merge1 content"}]}' }; try { const response = await fetch(url, options); const data = await response.json(); console.log(data); } catch (error) { console.error(error); } ``` ```go package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "https://mandrillapp.com/api/1.4/templates/render" payload := strings.NewReader("{\n \"key\": \"ONzNrsmbtNXoIKyfPmjnig\",\n \"template_name\": \"example-template\",\n \"template_content\": [\n {\n \"name\": \"editable\",\n \"content\": \"content\"\n }\n ],\n \"merge_vars\": [\n {\n \"name\": \"merge1\",\n \"content\": \"merge1 content\"\n }\n ]\n}") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("Content-Type", "application/json") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := io.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body)) } ``` ```ruby require 'uri' require 'net/http' url = URI("https://mandrillapp.com/api/1.4/templates/render") http = Net::HTTP.new(url.host, url.port) http.use_ssl = true request = Net::HTTP::Post.new(url) request["Content-Type"] = 'application/json' request.body = "{\n \"key\": \"ONzNrsmbtNXoIKyfPmjnig\",\n \"template_name\": \"example-template\",\n \"template_content\": [\n {\n \"name\": \"editable\",\n \"content\": \"content\"\n }\n ],\n \"merge_vars\": [\n {\n \"name\": \"merge1\",\n \"content\": \"merge1 content\"\n }\n ]\n}" response = http.request(request) puts response.read_body ``` ```java import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://mandrillapp.com/api/1.4/templates/render") .header("Content-Type", "application/json") .body("{\n \"key\": \"ONzNrsmbtNXoIKyfPmjnig\",\n \"template_name\": \"example-template\",\n \"template_content\": [\n {\n \"name\": \"editable\",\n \"content\": \"content\"\n }\n ],\n \"merge_vars\": [\n {\n \"name\": \"merge1\",\n \"content\": \"merge1 content\"\n }\n ]\n}") .asString(); ``` ```php request('POST', 'https://mandrillapp.com/api/1.4/templates/render', [ 'body' => '{ "key": "ONzNrsmbtNXoIKyfPmjnig", "template_name": "example-template", "template_content": [ { "name": "editable", "content": "content" } ], "merge_vars": [ { "name": "merge1", "content": "merge1 content" } ] }', 'headers' => [ 'Content-Type' => 'application/json', ], ]); echo $response->getBody(); ``` ```csharp using RestSharp; var client = new RestClient("https://mandrillapp.com/api/1.4/templates/render"); var request = new RestRequest(Method.POST); request.AddHeader("Content-Type", "application/json"); request.AddParameter("application/json", "{\n \"key\": \"ONzNrsmbtNXoIKyfPmjnig\",\n \"template_name\": \"example-template\",\n \"template_content\": [\n {\n \"name\": \"editable\",\n \"content\": \"content\"\n }\n ],\n \"merge_vars\": [\n {\n \"name\": \"merge1\",\n \"content\": \"merge1 content\"\n }\n ]\n}", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift import Foundation let headers = ["Content-Type": "application/json"] let parameters = [ "key": "ONzNrsmbtNXoIKyfPmjnig", "template_name": "example-template", "template_content": [ [ "name": "editable", "content": "content" ] ], "merge_vars": [ [ "name": "merge1", "content": "merge1 content" ] ] ] as [String : Any] let postData = JSONSerialization.data(withJSONObject: parameters, options: []) let request = NSMutableURLRequest(url: NSURL(string: "https://mandrillapp.com/api/1.4/templates/render")! as URL, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 10.0) request.httpMethod = "POST" request.allHTTPHeaderFields = headers request.httpBody = postData as Data let session = URLSession.shared let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in if (error != nil) { print(error as Any) } else { let httpResponse = response as? HTTPURLResponse print(httpResponse) } }) dataTask.resume() ``` > Find all the Mailchimp API documentation and tools developers need to send marketing and transactional emails.