diff --git a/meilisearch/_httprequests.py b/meilisearch/_httprequests.py
index 865080f9..eff32fce 100644
--- a/meilisearch/_httprequests.py
+++ b/meilisearch/_httprequests.py
@@ -21,15 +21,26 @@ def send_request(
         http_method: Callable,
         path: str,
         body: Optional[Union[Dict[str, Any], List[Dict[str, Any]], List[str]]] = None,
+        content_type: Optional[str] = None,
     ) -> Any:
+        if content_type:
+            self.headers['Content-Type'] = content_type
         try:
             request_path = self.config.url + '/' + path
-            request = http_method(
-                request_path,
-                timeout=self.config.timeout,
-                headers=self.headers,
-                data=json.dumps(body) if body else "null"
-            )
+            if not content_type:
+                request = http_method(
+                    request_path,
+                    timeout=self.config.timeout,
+                    headers=self.headers,
+                    data=json.dumps(body) if body else "null"
+                )
+            else:
+                request = http_method(
+                    request_path,
+                    timeout=self.config.timeout,
+                    headers=self.headers,
+                    data=body
+                )
             return self.__validate(request)
 
         except requests.exceptions.Timeout as err:
@@ -46,8 +57,9 @@ def post(
         self,
         path: str,
         body: Optional[Union[Dict[str, Any], List[Dict[str, Any]], List[str]]] = None,
+        content_type: Optional[str] = None,
     ) -> Any:
-        return self.send_request(requests.post, path, body)
+        return self.send_request(requests.post, path, body, content_type)
 
     def put(
         self,
diff --git a/meilisearch/index.py b/meilisearch/index.py
index 480ef4c0..bebcee74 100644
--- a/meilisearch/index.py
+++ b/meilisearch/index.py
@@ -391,6 +391,128 @@ def add_documents_in_batches(
 
         return update_ids
 
+    def add_documents_json(
+        self,
+        str_documents: str,
+        primary_key: Optional[str] = None,
+    ) -> Dict[str, int]:
+        """Add string documents from JSON file to the index.
+
+        Parameters
+        ----------
+        str_documents:
+            String of document from a JSON file.
+        primary_key (optional):
+            The primary-key used in index. Ignored if already set up.
+
+        Returns
+        -------
+        update:
+            Dictionary containing an update id to track the action:
+            https://docs.meilisearch.com/reference/api/updates.html#get-an-update-status
+
+        Raises
+        ------
+        MeiliSearchApiError
+            An error containing details about why MeiliSearch can't process your request. MeiliSearch error codes are described here: https://docs.meilisearch.com/errors/#meilisearch-errors
+        """
+        return self.add_documents_raw(str_documents, primary_key, 'json')
+
+    def add_documents_csv(
+        self,
+        str_documents: str,
+        primary_key: Optional[str] = None,
+    ) -> Dict[str, int]:
+        """Add string documents from a CSV file to the index.
+
+        Parameters
+        ----------
+        str_documents:
+            String of document from a CSV file.
+        primary_key (optional):
+            The primary-key used in index. Ignored if already set up.
+
+        Returns
+        -------
+        update:
+            Dictionary containing an update id to track the action:
+            https://docs.meilisearch.com/reference/api/updates.html#get-an-update-status
+
+        Raises
+        ------
+        MeiliSearchApiError
+            An error containing details about why MeiliSearch can't process your request. MeiliSearch error codes are described here: https://docs.meilisearch.com/errors/#meilisearch-errors
+        """
+        return self.add_documents_raw(str_documents, primary_key, 'csv')
+
+    def add_documents_ndjson(
+        self,
+        str_documents: str,
+        primary_key: Optional[str] = None,
+    ) -> Dict[str, int]:
+        """Add string documents from a NDJSON file to the index.
+
+        Parameters
+        ----------
+        str_documents:
+            String of document from a NDJSON file.
+        primary_key (optional):
+            The primary-key used in index. Ignored if already set up.
+
+        Returns
+        -------
+        update:
+            Dictionary containing an update id to track the action:
+            https://docs.meilisearch.com/reference/api/updates.html#get-an-update-status
+
+        Raises
+        ------
+        MeiliSearchApiError
+            An error containing details about why MeiliSearch can't process your request. MeiliSearch error codes are described here: https://docs.meilisearch.com/errors/#meilisearch-errors
+        """
+        return self.add_documents_raw(str_documents, primary_key, 'jsonl')
+
+    def add_documents_raw(
+        self,
+        str_documents: str,
+        primary_key: Optional[str] = None,
+        doc_type: Optional[str] = None,
+    ) -> Dict[str, int]:
+        """Add string documents to the index.
+
+        Parameters
+        ----------
+        str_documents:
+            String of document.
+        primary_key (optional):
+            The primary-key used in index. Ignored if already set up.
+        type:
+            The type of document. Type available: 'csv', 'json', 'jsonl'
+
+        Returns
+        -------
+        update:
+            Dictionary containing an update id to track the action:
+            https://docs.meilisearch.com/reference/api/updates.html#get-an-update-status
+
+        Raises
+        ------
+        MeiliSearchApiError
+            An error containing details about why MeiliSearch can't process your request. MeiliSearch error codes are described here: https://docs.meilisearch.com/errors/#meilisearch-errors
+        """
+        if primary_key is None:
+            url = f'{self.config.paths.index}/{self.uid}/{self.config.paths.document}'
+        else:
+            primary_key = urllib.parse.urlencode({'primaryKey': primary_key})
+            url = f'{self.config.paths.index}/{self.uid}/{self.config.paths.document}?{primary_key}'
+        if doc_type == "json":
+            content_type = 'application/json'
+        if doc_type == "jsonl":
+            content_type = 'application/x-ndjson'
+        if doc_type == "csv":
+            content_type = 'text/csv'
+        return self.http.post(url, str_documents, content_type)
+
     def update_documents(
         self,
         documents: List[Dict[str, Any]],