diff --git a/CHANGES.md b/CHANGES.md
index 52d79810b0..2579ef2814 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,6 @@
 ## current
 
+- lwt_jsoo: Use logs for the warnings and document it (mseri #776)
 - lwt: Use logs to warn users about leaked bodies and document it (mseri #771)
 - lwt, lwt_unix: Improve use of logs and the documentation, fix bug in the Debug.enable_debug function (mseri #772)
 - lwt_jsoo: Fix exception on connection errors in chrome (mefyl #761)
diff --git a/cohttp-lwt-jsoo.opam b/cohttp-lwt-jsoo.opam
index faa760a1ef..24c7fbd200 100644
--- a/cohttp-lwt-jsoo.opam
+++ b/cohttp-lwt-jsoo.opam
@@ -26,6 +26,7 @@ depends: [
   "dune" {>= "2.0"}
   "cohttp" {= version}
   "cohttp-lwt" {= version}
+  "logs"
   "lwt" {>= "3.0.0"}
   "lwt_ppx" {with-test}
   "conf-npm" {with-test}
diff --git a/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.ml b/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.ml
index 81a5172bfa..b6500d61a9 100644
--- a/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.ml
+++ b/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.ml
@@ -51,6 +51,10 @@ module IO = Cohttp_lwt__String_io
 module Header_io = Cohttp__Header_io.Make (IO)
 
 module Body_builder (P : Params) = struct
+  let src = Logs.Src.create "cohttp.lwt.jsoo" ~doc:"Cohttp Lwt JSOO module"
+
+  module Log = (val Logs.src_log src : Logs.LOG)
+
   (* perform the body transfer in chunks from string. *)
   let chunked_body_str text =
     let body_len = text##.length in
@@ -109,16 +113,14 @@ module Body_builder (P : Params) = struct
       in
       match xhr_response_supported with
       | true when Js.Opt.return xml##.response == Js.null ->
-          Firebug.console##log
-            (Js.string "XHR Response is null; using empty string");
+          Log.warn (fun m -> m "XHR Response is null; using empty string");
           `String (Js.string "")
       | true ->
           Js.Opt.case
             (File.CoerceTo.arrayBuffer xml##.response)
             (fun () ->
-              Firebug.console##log
-                (Js.string
-                   "XHR Response is not an arrayBuffer; using responseText");
+              Log.warn (fun m ->
+                  m "XHR Response is not an arrayBuffer; using responseText");
               respText ())
             (fun ab -> `ArrayBuffer ab)
       | false -> respText ()
diff --git a/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.mli b/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.mli
index 71b6382c40..e1b330e7f1 100644
--- a/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.mli
+++ b/cohttp-lwt-jsoo/src/cohttp_lwt_jsoo.mli
@@ -15,7 +15,16 @@
  *
   }}}*)
 
-(** HTTP client for JavaScript using XMLHttpRequest. *)
+(** {1 HTTP client for JavaScript using XMLHttpRequest.}
+
+    The {!Logs} source name for this module's logger is ["cohttp.lwt.jsoo"]. To
+    log the current warnings using the browser's console log, you can write a
+    custom reporter or use:
+
+    {[
+      let reporter = Logs_browser.console_reporter () in
+      Logs.set_reporter reporter
+    ]} *)
 
 (** Configuration parameters for the XmlHttpRequest engines *)
 module type Params = sig
diff --git a/cohttp-lwt-jsoo/src/dune b/cohttp-lwt-jsoo/src/dune
index 9b1cc0a4a7..18a372c53a 100644
--- a/cohttp-lwt-jsoo/src/dune
+++ b/cohttp-lwt-jsoo/src/dune
@@ -4,4 +4,4 @@
  (synopsis "XHR/Lwt based http client")
  (preprocess
   (pps js_of_ocaml-ppx))
- (libraries js_of_ocaml cohttp-lwt))
+ (libraries js_of_ocaml cohttp-lwt logs))