diff --git a/eodag/rest/server.py b/eodag/rest/server.py
index 026635be9..fc40a8b65 100755
--- a/eodag/rest/server.py
+++ b/eodag/rest/server.py
@@ -22,6 +22,7 @@
 from contextlib import asynccontextmanager
 from distutils import dist
 from json.decoder import JSONDecodeError
+from typing import List, Union
 
 import pkg_resources
 from fastapi import APIRouter as FastAPIRouter
@@ -31,6 +32,7 @@
 from fastapi.openapi.utils import get_openapi
 from fastapi.responses import FileResponse, ORJSONResponse
 from fastapi.types import Any, Callable, DecoratedCallable
+from pydantic import BaseModel
 from starlette.exceptions import HTTPException as StarletteHTTPException
 
 from eodag.config import load_stac_api_config
@@ -271,16 +273,31 @@ def stac_extension_oseo(request: Request):
     return jsonable_encoder(response)
 
 
+class SearchBody(BaseModel):
+    """
+    class which describes the body of a search request
+    """
+
+    provider: Union[str, None] = None
+    collections: Union[List[str], str]
+    datetime: Union[str, None] = None
+    bbox: Union[list, str, None] = None
+    limit: Union[int, None] = 20
+    page: Union[int, None] = 1
+    query: Union[dict, None] = None
+
+
 @router.get("/search", tags=["STAC"])
 @router.post("/search", tags=["STAC"])
-async def stac_search(request: Request):
+def stac_search(request: Request, search_body: SearchBody = None):
     """STAC collections items"""
     url = request.state.url
     url_root = request.state.url_root
-    try:
-        body = await request.json()
-    except JSONDecodeError:
+
+    if search_body is None:
         body = {}
+    else:
+        body = vars(search_body)
 
     arguments = dict(request.query_params, **body)
     provider = arguments.pop("provider", None)
@@ -288,7 +305,6 @@ async def stac_search(request: Request):
     response = search_stac_items(
         url=url, arguments=arguments, root=url_root, provider=provider
     )
-
     resp = ORJSONResponse(
         content=response, status_code=200, media_type="application/json"
     )
@@ -296,17 +312,15 @@ async def stac_search(request: Request):
 
 
 @router.get("/collections", tags=["Capabilities"])
-async def collections(request: Request):
+def collections(request: Request):
     """STAC collections
 
     Can be filtered using parameters: instrument, platform, platformSerialIdentifier, sensorType, processingLevel
     """
     url = request.state.url
     url_root = request.state.url_root
-    try:
-        body = await request.json()
-    except JSONDecodeError:
-        body = {}
+
+    body = {}
     arguments = dict(request.query_params, **body)
     provider = arguments.pop("provider", None)
 
@@ -316,19 +330,16 @@ async def collections(request: Request):
         arguments=arguments,
         provider=provider,
     )
-
     return jsonable_encoder(response)
 
 
 @router.get("/collections/{collection_id}/items", tags=["Data"])
-async def stac_collections_items(collection_id, request: Request):
+def stac_collections_items(collection_id, request: Request):
     """STAC collections items"""
     url = request.state.url
     url_root = request.state.url_root
-    try:
-        body = await request.json()
-    except JSONDecodeError:
-        body = {}
+
+    body = {}
     arguments = dict(request.query_params, **body)
     provider = arguments.pop("provider", None)
 
@@ -339,19 +350,16 @@ async def stac_collections_items(collection_id, request: Request):
         provider=provider,
         catalogs=[collection_id],
     )
-
     return jsonable_encoder(response)
 
 
 @router.get("/collections/{collection_id}", tags=["Capabilities"])
-async def collection_by_id(collection_id, request: Request):
+def collection_by_id(collection_id, request: Request):
     """STAC collection by id"""
     url = request.state.url
     url_root = request.state.url_root
-    try:
-        body = await request.json()
-    except JSONDecodeError:
-        body = {}
+
+    body = {}
     arguments = dict(request.query_params, **body)
     provider = arguments.pop("provider", None)
 
@@ -370,10 +378,8 @@ async def stac_collections_item(collection_id, item_id, request: Request):
     """STAC collection item by id"""
     url = request.state.url
     url_root = request.state.url_root
-    try:
-        body = await request.json()
-    except JSONDecodeError:
-        body = {}
+
+    body = {}
     arguments = dict(request.query_params, **body)
     provider = arguments.pop("provider", None)
 
@@ -397,12 +403,10 @@ async def stac_collections_item(collection_id, item_id, request: Request):
 
 
 @router.get("/collections/{collection_id}/items/{item_id}/download", tags=["Data"])
-async def stac_collections_item_download(collection_id, item_id, request: Request):
+def stac_collections_item_download(collection_id, item_id, request: Request):
     """STAC collection item local download"""
-    try:
-        body = await request.json()
-    except JSONDecodeError:
-        body = {}
+
+    body = {}
     arguments = dict(request.query_params, **body)
     provider = arguments.pop("provider", None)
 
diff --git a/eodag/rest/utils.py b/eodag/rest/utils.py
index c424a6470..de5d168a7 100644
--- a/eodag/rest/utils.py
+++ b/eodag/rest/utils.py
@@ -232,7 +232,9 @@ def get_geometry(arguments):
 
     geom = None
 
-    if "bbox" in arguments or "box" in arguments:
+    if ("bbox" in arguments and arguments["bbox"] is not None) or (
+        "box" in arguments and arguments["box"] is not None
+    ):
         # get bbox
         request_bbox = arguments.pop("bbox", None) or arguments.pop("box", None)
         if request_bbox and isinstance(request_bbox, str):
@@ -688,7 +690,7 @@ def search_stac_items(url, arguments, root="/", catalogs=[], provider=None):
         arguments.pop("ids")
 
     # get datetime
-    if "datetime" in arguments.keys():
+    if "datetime" in arguments.keys() and arguments["datetime"] is not None:
         dtime_split = arguments.get("datetime", "").split("/")
         if len(dtime_split) > 1:
             arguments["dtstart"] = (