diff --git a/halfapi/cli/run.py b/halfapi/cli/run.py
index 6ebc0be..461bb73 100644
--- a/halfapi/cli/run.py
+++ b/halfapi/cli/run.py
@@ -22,11 +22,11 @@ from ..lib.schemas import schema_csv_dict
 @click.option('--loglevel', default=LOGLEVEL)
 @click.option('--prefix', default='/')
 @click.option('--check', default=True)
+@click.option('--dryrun', default=False, is_flag=True)
 @click.argument('schema', type=click.File('r'), required=False)
-@click.argument('router', required=False)
 @click.argument('domain', required=False)
 @cli.command()
-def run(host, port, reload, secret, production, loglevel, prefix, check, schema, router, domain):
+def run(host, port, reload, secret, production, loglevel, prefix, check, dryrun, schema, domain):
     """
     The "halfapi run" command
     """
@@ -51,7 +51,6 @@ def run(host, port, reload, secret, production, loglevel, prefix, check, schema,
     click.echo(f'Launching application {PROJECT_NAME}')
 
     CONFIG.get('domain')['name'] = domain
-    CONFIG.get('domain')['router'] = router
 
     if schema:
         # Populate the SCHEMA global with the data from the given file
@@ -67,6 +66,9 @@ def run(host, port, reload, secret, production, loglevel, prefix, check, schema,
         f'reload: {reload}\n'
     )
 
+    if dryrun:
+        CONFIG['dryrun'] = True
+
     uvicorn.run('halfapi.app:application',
         host=host,
         port=int(port),
diff --git a/halfapi/conf.py b/halfapi/conf.py
index 06611a3..2c17b42 100644
--- a/halfapi/conf.py
+++ b/halfapi/conf.py
@@ -17,6 +17,7 @@ It defines the following globals :
     - HOST (str) - HALFAPI_HOST
     - PORT (int) - HALFAPI_PORT
     - CONF_DIR (str) - HALFAPI_CONF_DIR
+    - DRYRUN (bool) - HALFAPI_DRYRUN
     - config (ConfigParser)
 
 It reads the following ressource :
@@ -53,6 +54,7 @@ HOST = '127.0.0.1'
 PORT = '3000'
 SECRET = ''
 CONF_FILE = os.environ.get('HALFAPI_CONF_FILE', '.halfapi/config')
+DRYRUN = bool(os.environ.get('HALFAPI_DRYRUN', False))
 
 DOMAIN = None
 ROUTER = None
@@ -143,6 +145,7 @@ CONFIG = {
     'secret': SECRET,
     'host': HOST,
     'port': PORT,
+    'dryrun': DRYRUN,
     'domain': {
         'name': None,
         'router': None
diff --git a/halfapi/halfapi.py b/halfapi/halfapi.py
index 0a73591..8ed1e57 100644
--- a/halfapi/halfapi.py
+++ b/halfapi/halfapi.py
@@ -52,11 +52,12 @@ class HalfAPI:
         SECRET = config.get('secret')
         PRODUCTION = config.get('production', True)
         CONFIG = config.get('config', {})
+        DRYRUN = config.get('dryrun', False)
 
         domain = config.get('domain')['name']
         router = config.get('domain').get('router', None)
 
-        if not (domain and router):
+        if not (domain):
             raise NoDomainsException()
 
         self.PRODUCTION = PRODUCTION
@@ -95,6 +96,13 @@ class HalfAPI:
             for route in gen_domain_routes(m_domain_router):
                 routes.append(route)
 
+        startup_fcts = []
+
+        if DRYRUN:
+            startup_fcts.append(
+                HalfAPI.wait_quit()
+            )
+
         self.__application = Starlette(
             debug=not PRODUCTION,
             routes=routes,
@@ -104,7 +112,8 @@ class HalfAPI:
                 500: InternalServerErrorResponse,
                 501: NotImplementedResponse,
                 503: ServiceUnavailableResponse
-            }
+            },
+            on_startup=startup_fcts
         )
 
         self.__application.add_middleware(
@@ -181,3 +190,12 @@ class HalfAPI:
     @staticmethod
     def api_schema(domain):
         pass
+
+    @staticmethod
+    def wait_quit():
+        """ sleeps 1 second and quits. used in dry-run mode
+        """
+        import time
+        import sys
+        time.sleep(1)
+        sys.exit(0)
diff --git a/halfapi/testing/test_domain.py b/halfapi/testing/test_domain.py
index 26681a9..5c995a8 100644
--- a/halfapi/testing/test_domain.py
+++ b/halfapi/testing/test_domain.py
@@ -48,4 +48,8 @@ class TestDomain(TestCase):
         result = self.runner.invoke(cli, ['domain', self.DOMAIN])
         self.assertEqual(result.exit_code, 0)
         result_d = json.loads(result.stdout)
-        return result.stdout
+        result = self.runner.invoke(cli, ['run', '--dryrun', self.DOMAIN])
+        print(result.stdout)
+        self.assertEqual(result.exit_code, 0)
+
+        return result_d