Added Robustness

There are a lot of changes here:
-Fixed a lot of issues encountered during my testing
-JSON path is evaluated BEFORE making comparisons (this was the true intended behavior by @chakflying)
-Variable name changes (cosmetic)
-Added != operator
-Changed jsonQueryDescription (again)

server/model/monitor.js

@@ -600,23 +600,12 @@ class Monitor extends BeanModel {
                     } else if (this.type === "json-query") {
                         let data = res.data;
 
-                        // convert data to object
+                        const { status, response } = await evaluateJsonQuery(data, this.jsonPath, this.jsonPathOperator, this.expectedValue);
-                        if (typeof data === "string" && res.headers["content-type"] !== "application/json") {
-                            try {
-                                data = JSON.parse(data);
-                            } catch (_) {
-                                // Failed to parse as JSON, just process it as a string
-                            }
-                        }
 
-                        const { status, evaluation } = await evaluateJsonQuery(data, this.jsonPath, this.jsonPathOperator, this.expectedValue);
+                        bean.status = status ? UP : DOWN;
+                        bean.msg = `JSON query ${status ? "passes" : "does not pass"} `;
+                        bean.msg += `comparison: ${response} ${this.jsonPathOperator} ${this.expectedValue}.`;
 
-                        if (status) {
-                            bean.msg += ", expected value is found";
-                            bean.status = UP;
-                        } else {
-                            throw new Error(`${bean.msg}, but value is not equal to expected value, value was: [${evaluation}]`);
-                        }
                     }
 
                 } else if (this.type === "port") {

server/monitor-types/snmp.js

@@ -44,13 +44,11 @@ class SNMPMonitorType extends MonitorType {
             // We restrict querying to one OID per monitor, therefore `varbinds[0]` will always contain the value we're interested in.
             const value = varbinds[0].value;
 
-            const { status, evaluation } = await evaluateJsonQuery(value, monitor.jsonPath, monitor.jsonPathOperator, monitor.expectedValue);
+            const { status, response } = await evaluateJsonQuery(value, monitor.jsonPath, monitor.jsonPathOperator, monitor.expectedValue);
 
             heartbeat.status = status ? UP : DOWN;
             heartbeat.msg = `SNMP value ${status ? "passes" : "does not pass"} `;
-            heartbeat.msg += (monitor.jsonPathOperator === "custom")
+            heartbeat.msg += `comparison: ${response} ${monitor.jsonPathOperator} ${monitor.expectedValue}.`;
-                ? `custom query. Query result: ${evaluation}. Expected Value: ${monitor.expectedValue}.`
-                : `comparison: ${value.toString()} ${monitor.jsonPathOperator} ${monitor.expectedValue}.`;
 
         } catch (err) {
             heartbeat.status = DOWN;

src/lang/en.json

@@ -59,7 +59,7 @@
     "Keyword": "Keyword",
     "Invert Keyword": "Invert Keyword",
     "Expected Value": "Expected Value",
-    "Custom Json Query Expression": "Custom Json Query Expression",
+    "Json Query Expression": "Json Query Expression",
     "Friendly Name": "Friendly Name",
     "URL": "URL",
     "Hostname or IP Address": "Hostname or IP Address",
@@ -577,7 +577,7 @@
     "notificationDescription": "Notifications must be assigned to a monitor to function.",
     "keywordDescription": "Search keyword in plain HTML or JSON response. The search is case-sensitive.",
     "invertKeywordDescription": "Look for the keyword to be absent rather than present.",
-    "jsonQueryDescription": "Use JSON query to parse and extract specific data from the server's JSON response. Compare the evaluated query against the expected value after converting it into a string. Refer to {0} for detailed documentation on the query language or experiment with queries using the {1}.",
+    "jsonQueryDescription": "Parse and extract specific data from the server's JSON response using JSON query or use \"$\" for the raw response, if not expecting JSON. The result is then compared to the expected value, as strings. See {0} for documentation and use {1} to experiment with queries.",
     "backupDescription": "You can backup all monitors and notifications into a JSON file.",
     "backupDescription2": "Note: history and event data is not included.",
     "backupDescription3": "Sensitive data such as notification tokens are included in the export file; please store export securely.",

src/pages/EditMonitor.vue

@@ -277,13 +277,13 @@
                             <!-- Json Query -->
                             <!-- For Json Query / SNMP -->
                             <div v-if="monitor.type === 'json-query' || monitor.type === 'snmp'" class="my-3">
-                                <div v-if="monitor.jsonPathOperator == 'custom'" class="my-2">
+                                <div class="my-2">
                                     <label for="jsonPath" class="form-label mb-0">{{ $t("Json Query Expression") }}</label>
                                     <i18n-t tag="div" class="form-text mb-2" keypath="jsonQueryDescription">
                                         <a href="https://jsonata.org/">jsonata.org</a>
                                         <a href="https://try.jsonata.org/">{{ $t('playground') }}</a>
                                     </i18n-t>
-                                    <input id="jsonPath" v-model="monitor.jsonPath" type="text" class="form-control" placeholder="$.value" required>
+                                    <input id="jsonPath" v-model="monitor.jsonPath" type="text" class="form-control" placeholder="$" required>
                                 </div>
 
                                 <div class="d-flex align-items-start">
@@ -294,14 +294,14 @@
                                             <option value=">=">&gt;=</option>
                                             <option value="<">&lt;</option>
                                             <option value="<=">&lt;=</option>
+                                            <option value="!=">&#33;=</option>
                                             <option value="==">==</option>
                                             <option value="contains">contains</option>
-                                            <option value="custom">custom</option>
                                         </select>
                                     </div>
                                     <div class="flex-grow-1">
-                                        <label for="expectedValue" class="form-label">{{ $t("Expected Value (Control)") }}</label>
+                                        <label for="expectedValue" class="form-label">{{ $t("Expected Value") }}</label>
-                                        <input v-if="monitor.jsonPathOperator !== 'contains' && monitor.jsonPathOperator !== '==' && monitor.jsonPathOperator !== 'custom'" id="expectedValue" v-model="monitor.expectedValue" type="number" class="form-control" required step=".01">
+                                        <input v-if="monitor.jsonPathOperator !== 'contains' && monitor.jsonPathOperator !== '=='" id="expectedValue" v-model="monitor.expectedValue" type="number" class="form-control" required step=".01">
                                         <input v-else id="expectedValue" v-model="monitor.expectedValue" type="text" class="form-control" required>
                                     </div>
                                 </div>
@@ -1330,10 +1330,13 @@ message HealthCheckResponse {
                 this.monitor.snmpVersion = "1";
             }
 
+            // Set default jsonPath
+            if (!this.monitor.jsonPath) {
+                this.monitor.jsonPath = "$";
+            }
+
             // Set default condition for for jsonPathOperator
-            if (this.monitor.type === "json-query") {
+            if (!this.monitor.jsonPathOperator) {
-                this.monitor.jsonPathOperator = "custom";
-            } else {
                 this.monitor.jsonPathOperator = "==";
             }
 

src/util.js

@@ -398,7 +398,6 @@ function intHash(str, length = 10) {
 }
 exports.intHash = intHash;
 async function evaluateJsonQuery(data, jsonPath, jsonPathOperator, expectedValue) {
-    const expected = isNaN(expectedValue) ? expectedValue.toString() : parseFloat(expectedValue);
     let response;
     try {
         response = JSON.parse(data);
@@ -406,46 +405,43 @@ async function evaluateJsonQuery(data, jsonPath, jsonPathOperator, expectedValue
     catch (_a) {
         response = typeof data === "number" || typeof data === "object" ? data : data.toString();
     }
+    if (jsonPath && typeof data === "object") {
+        try {
+            response = await jsonata(jsonPath).evaluate(response);
+        }
+        catch (err) {
+            throw new Error(`Error evaluating JSON query: ${err.message}`);
+        }
+    }
     let jsonQueryExpression;
     switch (jsonPathOperator) {
         case ">":
         case ">=":
         case "<":
         case "<=":
-            jsonQueryExpression = `$.value ${jsonPathOperator} $.control`;
+        case "!=":
+            jsonQueryExpression = `$.value ${jsonPathOperator} $.expected`;
             break;
         case "==":
-            jsonQueryExpression = "$string($.value) = $string($.control)";
+            jsonQueryExpression = "$string($.value) = $string($.expected)";
             break;
         case "contains":
-            jsonQueryExpression = "$contains($string($.value), $string($.control))";
+            jsonQueryExpression = "$contains($string($.value), $string($.expected))";
-            break;
-        case "custom":
-            jsonQueryExpression = jsonPath;
             break;
         default:
             throw new Error(`Invalid condition ${jsonPathOperator}`);
     }
     const expression = jsonata(jsonQueryExpression);
-    let evaluation;
+    const status = await expression.evaluate({
-    if (jsonPathOperator === "custom") {
+        value: response.toString(),
-        evaluation = await expression.evaluate(response);
+        expected: expectedValue.toString()
-    }
-    else {
-        evaluation = await expression.evaluate({
-            value: response,
-            control: expectedValue
     });
-    }
+    if (response === undefined || status === undefined) {
-    if (evaluation === undefined) {
         throw new Error("Query evaluation returned undefined. Check your query syntax and the structure of the response data.");
     }
-    const status = (jsonPathOperator === "custom")
-        ? evaluation.toString() === expected.toString()
-        : evaluation;
     return {
         status,
-        evaluation
+        response
     };
 }
 exports.evaluateJsonQuery = evaluateJsonQuery;

src/util.ts

@@ -654,10 +654,8 @@ export function intHash(str : string, length = 10) : number {
  * @returns An object containing the status and the evaluation result.
  * @throws Error if the evaluation returns undefined.
  */
-export async function evaluateJsonQuery(data: any, jsonPath: string, jsonPathOperator: string, expectedValue: any): Promise<{ status: boolean; evaluation: any }> {
+export async function evaluateJsonQuery(data: any, jsonPath: string, jsonPathOperator: string, expectedValue: any): Promise<{ status: boolean; response: any }> {
-    // Check if inputs are numeric. If not, re-parse as strings. This ensures comparisons are handled correctly.
+    // Attempt to parse data as JSON; if unsuccessful, handle based on data type.
-    const expected = isNaN(expectedValue) ? expectedValue.toString() : parseFloat(expectedValue);
-
     let response: any;
     try {
         response = JSON.parse(data);
@@ -665,22 +663,31 @@ export async function evaluateJsonQuery(data: any, jsonPath: string, jsonPathOpe
         response = typeof data === "number" || typeof data === "object" ? data : data.toString();
     }
 
+    // If a JSON path is provided, pre-evaluate the data using it.
+    if (jsonPath && typeof data === "object") {
+        try {
+            response = await jsonata(jsonPath).evaluate(response);
+        } catch (err: any) {
+            throw new Error(`Error evaluating JSON query: ${err.message}`);
+        }
+    }
+
+    // Perform the comparison logic using the chosen operator
+    // Perform the comparison logic using the chosen operator
     let jsonQueryExpression;
     switch (jsonPathOperator) {
         case ">":
         case ">=":
         case "<":
         case "<=":
-            jsonQueryExpression = `$.value ${jsonPathOperator} $.control`;
+        case "!=":
+            jsonQueryExpression = `$.value ${jsonPathOperator} $.expected`;
             break;
         case "==":
-            jsonQueryExpression = "$string($.value) = $string($.control)";
+            jsonQueryExpression = "$string($.value) = $string($.expected)";
             break;
         case "contains":
-            jsonQueryExpression = "$contains($string($.value), $string($.control))";
+            jsonQueryExpression = "$contains($string($.value), $string($.expected))";
-            break;
-        case "custom":
-            jsonQueryExpression = jsonPath;
             break;
         default:
             throw new Error(`Invalid condition ${jsonPathOperator}`);
@@ -688,27 +695,17 @@ export async function evaluateJsonQuery(data: any, jsonPath: string, jsonPathOpe
 
     // Evaluate the JSON Query Expression
     const expression = jsonata(jsonQueryExpression);
-
+    const status = await expression.evaluate({
-    let evaluation;
+        value: response.toString(),
-    if (jsonPathOperator === "custom") {
+        expected: expectedValue.toString()
-        evaluation = await expression.evaluate(response);
-    } else {
-        evaluation = await expression.evaluate({
-            value: response,
-            control: expectedValue
     });
-    }
 
-    if (evaluation === undefined) {
+    if (response === undefined || status === undefined) {
         throw new Error("Query evaluation returned undefined. Check your query syntax and the structure of the response data.");
     }
 
-    const status = (jsonPathOperator === "custom")
-        ? evaluation.toString() === expected.toString()
-        : evaluation;
-
     return {
-        status,
+        status,  // The evaluation of the json query
-        evaluation
+        response // The response from the server or result from initial json-query evaluation
     };
 }