diff --git a/server/model/monitor.js b/server/model/monitor.js
index 33ad82f0..2738898f 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -99,31 +99,6 @@ class Monitor extends BeanModel {
         return JSON.parse(this.accepted_statuscodes_json);
     }
 
-    /**
-     * Convert header string into an object:
-     * eg:
-     *
-     * Authorization: Basic <credentials>
-     * Content-Type: application/json
-     *
-     * into
-     *
-     * {
-     *     "Authorization": "Basic <credentials>",
-     *     "Content-Type": "application/json"
-     * }
-     **/
-    getParsedHeaders() {
-        if (!this.headers || !this.headers.includes(":")) {
-            return {};
-        }
-        return Object.fromEntries(this.headers.split("\n").map(header => {
-            const trimmedHeader = header.trim();
-            const firstColonIndex = trimmedHeader.indexOf(":");
-            return [trimmedHeader.slice(0, firstColonIndex), trimmedHeader.slice(firstColonIndex + 1) || ""];
-        }).filter(arr => !!arr[0] && !!arr[1]));
-    }
-
     start(io) {
         let previousBeat = null;
         let retries = 0;
@@ -173,7 +148,7 @@ class Monitor extends BeanModel {
                         headers: {
                             "Accept": "*/*",
                             "User-Agent": "Uptime-Kuma/" + version,
-                            ...this.getParsedHeaders(),
+                            ...JSON.parse(this.headers),
                         },
                         httpsAgent: new https.Agent({
                             maxCachedSessions: 0,      // Use Custom agent to disable session reuse (https://github.com/nodejs/node/issues/3940)
diff --git a/src/languages/en.js b/src/languages/en.js
index 7871f0fe..a5ad24e0 100644
--- a/src/languages/en.js
+++ b/src/languages/en.js
@@ -285,8 +285,8 @@ export default {
     Body: "Body",
     Headers: "Headers",
     PushUrl: "Push URL",
-    HeadersInvalidFormat: "Headers do not have a valid format: \"key: value <new line> key: value <new line>...\"",
+    HeadersInvalidFormat: "The request headers are not valid JSON: ",
     BodyInvalidFormat: "The request body is not valid JSON: ",
     BodyPlaceholder: "&lbrace;\n\t\"id\": 124357,\n\t\"username\": \"admin\",\n\t\"password\": \"myAdminPassword\"\n&rbrace;",
-    HeadersPlaceholder: "Authorization: Bearer abc123\nContent-Type: application/json",
+    HeadersPlaceholder: "&lbrace;\n\t\"Authorization\": \"Bearer abc123\",\n\t\"Content-Type\": \"application/json\"\n&rbrace;",
 };
diff --git a/src/languages/nl-NL.js b/src/languages/nl-NL.js
index 33d84cd5..170b4a3c 100644
--- a/src/languages/nl-NL.js
+++ b/src/languages/nl-NL.js
@@ -202,8 +202,8 @@ export default {
     Body: "Body",
     Headers: "Headers",
     PushUrl: "Push URL",
-    HeadersInvalidFormat: "Headers hebben een incorrect formaat: \"key: waarde <new line> key: waarde <new line>...\"",
+    HeadersInvalidFormat: "The request headers is geen geldige JSON: ",
     BodyInvalidFormat: "De request body is geen geldige JSON: ",
     BodyPlaceholder: "&lbrace;\n\t\"id\": 124357,\n\t\"gebruikersnaam\": \"admin\",\n\t\"wachtwoord\": \"mijnAdminWachtwoord\"\n&rbrace;",
-    HeadersPlaceholder: "Authorization: Bearer abc123\nContent-Type: application/json",
+    HeadersPlaceholder: "&lbrace;\n\t\"Authorization\": \"Bearer abc123\",\n\t\"Content-Type\": \"application/json\"\n&rbrace;",
 };
diff --git a/src/pages/EditMonitor.vue b/src/pages/EditMonitor.vue
index 5074dab9..ed8b359e 100644
--- a/src/pages/EditMonitor.vue
+++ b/src/pages/EditMonitor.vue
@@ -442,8 +442,10 @@ export default {
                 }
             }
             if (this.monitor.headers) {
-                if (!/^([^:]+:.*)([\s]+[^:]+:.*)*$/g.test(this.monitor.headers)) {
-                    toast.error(this.$t("HeadersInvalidFormat"));
+                try {
+                    JSON.parse(this.monitor.headers);
+                } catch (err) {
+                    toast.error(this.$t("HeadersInvalidFormat") + err.message);
                     return false;
                 }
             }