How to pass parameters by POST to an Azure function?

Solution 1:

In case google took you here, this is how it's done in March 2019 (Azure Functions v3):

public static async void Run(
            [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)]
            HttpRequest req,
            ILogger log)
        {
            var content = await new StreamReader(req.Body).ReadToEndAsync();

            MyClass myClass = JsonConvert.DeserializeObject<MyClass>(content);
            
        }

Solution 2:

To get the request content from the request body(post request), you could use req.Content.ReadAsAsync method. Here is the code sample.

Sample request body.

{
    "name": "Azure"
}

Define a class to deserialize the post data.

public class PostData
{
    public string name { get;set; }    
}

Get the post data and display it.

PostData data = await req.Content.ReadAsAsync<PostData>();
log.Info("name:" + data.name);

Client side code to send the post request.

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("function-url");
req.Method = "POST";
req.ContentType = "application/json";
Stream stream = req.GetRequestStream();
string json = "{\"name\": \"Azure\" }";
byte[] buffer = Encoding.UTF8.GetBytes(json);
stream.Write(buffer,0, buffer.Length);
HttpWebResponse res = (HttpWebResponse)req.GetResponse();

Solution 3:

If you are using System.Text.Json, you can read the POST data in one line:

public static async Task Run(
    [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)]
    HttpRequest req,
    ILogger log)
{
    MyClass myClass = await JsonSerializer.DeserializeAsync<MyClass>(req.Body);
}

If you are using Newtonsoft.Json, see the answer by Allen Zhang.

Solution 4:

For passing parameters as POST request, you need to do following things:

1. Make Json model of the parameters that u need to pass,ex:

   {"UserProfile":{ "UserId":"xyz1","FirstName":"Tom","LastName":"Hank" }}
   

2. Post your data model using client like POSTMAN

   

3. Now you will get the posted content in HttpRequestMessage body, sample code is as follows:

   [FunctionName("TestPost")]
   public static HttpResponseMessage POST([HttpTrigger(AuthorizationLevel.Function, "put", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
   {
       try
       {
           //create redis connection and database
           var RedisConnection = RedisConnectionFactory.GetConnection();
           var serializer = new NewtonsoftSerializer();
           var cacheClient = new StackExchangeRedisCacheClient(RedisConnection, serializer);
   
           //read json object from request body
           var content = req.Content;
           string JsonContent = content.ReadAsStringAsync().Result;
   
           var expirytime = DateTime.Now.AddHours(Convert.ToInt16(ConfigurationSettings.AppSettings["ExpiresAt"]));
   
           SessionModel ObjModel = JsonConvert.DeserializeObject<SessionModel>(JsonContent);
           bool added = cacheClient.Add("RedisKey", ObjModel, expirytime); //store to cache 
   
           return req.CreateResponse(HttpStatusCode.OK, "RedisKey");
       }
       catch (Exception ex)
       {
           return req.CreateErrorResponse(HttpStatusCode.InternalServerError, "an error has occured");
       }
   }