diff --git a/changelogs/fragments/2878-validate-certs-bool.yml b/changelogs/fragments/2878-validate-certs-bool.yml
new file mode 100644
index 0000000000..e636f4981b
--- /dev/null
+++ b/changelogs/fragments/2878-validate-certs-bool.yml
@@ -0,0 +1,2 @@
+minor_changes:
+- "nrdp callback plugin - parameters are now converted to strings, except ``validate_certs`` which is converted to boolean (https://github.com/ansible-collections/community.general/pull/2878)."
diff --git a/plugins/callback/nrdp.py b/plugins/callback/nrdp.py
index f17785a92f..744c2d2ed4 100644
--- a/plugins/callback/nrdp.py
+++ b/plugins/callback/nrdp.py
@@ -10,22 +10,23 @@ DOCUMENTATION = '''
     name: nrdp
     type: notification
     author: "Remi VERCHERE (@rverchere)"
-    short_description: post task result to a nagios server through nrdp
+    short_description: Post task results to a Nagios server through nrdp
     description:
-        - this callback send playbook result to nagios
-        - nagios shall use NRDP to recive passive events
-        - the passive check is sent to a dedicated host/service for ansible
+        - This callback send playbook result to Nagios.
+        - Nagios shall use NRDP to recive passive events.
+        - The passive check is sent to a dedicated host/service for Ansible.
     options:
         url:
-            description: url of the nrdp server
-            required: True
+            description: URL of the nrdp server.
+            required: true
             env:
                 - name : NRDP_URL
             ini:
                 - section: callback_nrdp
                   key: url
+            type: string
         validate_certs:
-            description: (bool) validate the SSL certificate of the nrdp server. (For HTTPS url)
+            description: Validate the SSL certificate of the nrdp server. (Used for HTTPS URLs.)
             env:
                 - name: NRDP_VALIDATE_CERTS
             ini:
@@ -33,32 +34,36 @@ DOCUMENTATION = '''
                   key: validate_nrdp_certs
                 - section: callback_nrdp
                   key: validate_certs
-            default: False
+            type: boolean
+            default: false
             aliases: [ validate_nrdp_certs ]
         token:
-            description: token to be allowed to push nrdp events
-            required: True
+            description: Token to be allowed to push nrdp events.
+            required: true
             env:
                 - name: NRDP_TOKEN
             ini:
                 - section: callback_nrdp
                   key: token
+            type: string
         hostname:
-            description: hostname where the passive check is linked to
-            required: True
+            description: Hostname where the passive check is linked to.
+            required: true
             env:
                 - name : NRDP_HOSTNAME
             ini:
                 - section: callback_nrdp
                   key: hostname
+            type: string
         servicename:
-            description: service where the passive check is linked to
-            required: True
+            description: Service where the passive check is linked to.
+            required: true
             env:
                 - name : NRDP_SERVICENAME
             ini:
                 - section: callback_nrdp
                   key: servicename
+            type: string
 '''
 
 import os