diff --git a/nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/IsJsonEvaluator.java b/nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/IsJsonEvaluator.java
index 4d3815dc26f1..4f26dd0b0d6f 100644
--- a/nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/IsJsonEvaluator.java
+++ b/nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/IsJsonEvaluator.java
@@ -17,7 +17,6 @@
 package org.apache.nifi.attribute.expression.language.evaluation.functions;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-import org.apache.commons.lang3.StringUtils;
 import org.apache.nifi.attribute.expression.language.EvaluationContext;
 import org.apache.nifi.attribute.expression.language.evaluation.BooleanEvaluator;
 import org.apache.nifi.attribute.expression.language.evaluation.BooleanQueryResult;
@@ -37,13 +36,15 @@ public IsJsonEvaluator(Evaluator<String> subject) {
     @Override
     public QueryResult<Boolean> evaluate(EvaluationContext evaluationContext) {
         final String subjectValue = subject.evaluate(evaluationContext).getValue();
-        if (StringUtils.isNotBlank(subjectValue)
-                && (isPossibleJsonArray(subjectValue) || isPossibleJsonObject(subjectValue))) {
-            try {
-                MAPPER.readTree(subjectValue);
-                return new BooleanQueryResult(true);
-            } catch (IOException ignored) {
-                //IOException ignored
+        if (subjectValue != null) {
+            final String trimmedSubjectValue = subjectValue.trim();
+            if (isPossibleJsonArray(trimmedSubjectValue) || isPossibleJsonObject(trimmedSubjectValue)) {
+                try {
+                    MAPPER.readTree(trimmedSubjectValue);
+                    return new BooleanQueryResult(true);
+                } catch (IOException ignored) {
+                    //IOException ignored
+                }
             }
         }
         return new BooleanQueryResult(false);
diff --git a/nifi-commons/nifi-expression-language/src/test/java/org/apache/nifi/attribute/expression/language/TestQuery.java b/nifi-commons/nifi-expression-language/src/test/java/org/apache/nifi/attribute/expression/language/TestQuery.java
index 3270bd69b837..2bb819233770 100644
--- a/nifi-commons/nifi-expression-language/src/test/java/org/apache/nifi/attribute/expression/language/TestQuery.java
+++ b/nifi-commons/nifi-expression-language/src/test/java/org/apache/nifi/attribute/expression/language/TestQuery.java
@@ -2498,6 +2498,7 @@ public void testUuidsWithNamespace() {
     void testIsJson() {
         final Map<String, String> attributes = new HashMap<>();
         attributes.put("jsonObj", "{\"name\":\"John\", \"age\":30, \"car\":null}");
+        attributes.put("jsonObjWithLeadingAndTrailingingSpaces", "\n{\"name\":\"John\", \"age\":30, \"car\":null}\n");
         attributes.put("jsonObjMissingStartingBrace", "\"name\":\"John\", \"age\":30, \"car\":null}");
         attributes.put("jsonObjMissingEndingBrace", "{\"name\":\"John\", \"age\":30, \"car\":null");
         attributes.put("jsonArray", "[\"Ford\", \"BMW\", \"Fiat\"]");
@@ -2512,6 +2513,7 @@ void testIsJson() {
         attributes.put("nullAttr", "null");
 
         verifyEquals("${jsonObj:isJson()}", attributes, true);
+        verifyEquals("${jsonObjWithLeadingAndTrailingingSpaces:isJson()}", attributes, true);
         verifyEquals("${jsonObjMissingStartingBrace:isJson()}", attributes, false);
         verifyEquals("${jsonObjMissingEndingBrace:isJson()}", attributes, false);
         verifyEquals("${jsonArray:isJson()}", attributes, true);
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/AttributesToJSON.java b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/AttributesToJSON.java
index 17adfeab3371..41eb455f74ed 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/AttributesToJSON.java
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/AttributesToJSON.java
@@ -324,11 +324,14 @@ private Map<String, Object> getFormattedAttributes(Map<String, Object> flowFileA
         Map<String, Object> formattedAttributes = new LinkedHashMap<>();
         for (Map.Entry<String, Object> entry : flowFileAttributes.entrySet()) {
             String value = (String) entry.getValue();
-            if (StringUtils.isNotBlank(value) && (isPossibleJsonArray(value) || isPossibleJsonObject(value))) {
-                formattedAttributes.put(entry.getKey(), OBJECT_MAPPER.readTree(value));
-            } else {
-                formattedAttributes.put(entry.getKey(), value);
+            if (value != null) {
+                final String trimmedValue = value.trim();
+                if (isPossibleJsonArray(trimmedValue) || isPossibleJsonObject(trimmedValue)) {
+                    formattedAttributes.put(entry.getKey(), OBJECT_MAPPER.readTree(trimmedValue));
+                    continue;
+                }
             }
+            formattedAttributes.put(entry.getKey(), value);
         }
 
         return formattedAttributes;
diff --git a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestAttributesToJSON.java b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestAttributesToJSON.java
index a0c0e9e17910..fbcc3c96e5ce 100644
--- a/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestAttributesToJSON.java
+++ b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestAttributesToJSON.java
@@ -17,6 +17,7 @@
 
 package org.apache.nifi.processors.standard;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.nifi.flowfile.FlowFile;
 import org.apache.nifi.flowfile.attributes.CoreAttributes;
@@ -42,6 +43,7 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 import static org.junit.jupiter.api.Assertions.assertNull;
@@ -54,6 +56,8 @@ public class TestAttributesToJSON {
     private static final String TEST_ATTRIBUTE_KEY = "TestAttribute";
     private static final String TEST_ATTRIBUTE_VALUE = "TestValue";
 
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
     @Test
     public void testInvalidUserSuppliedAttributeList() {
         final TestRunner testRunner = TestRunners.newTestRunner(new AttributesToJSON());
@@ -109,8 +113,7 @@ public void testNullValueForEmptyAttribute() throws Exception {
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
 
         assertNull(val.get(NON_PRESENT_ATTRIBUTE_KEY));
     }
@@ -139,8 +142,7 @@ public void testEmptyStringValueForEmptyAttribute() throws Exception {
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
 
         assertEquals(val.get(NON_PRESENT_ATTRIBUTE_KEY), "");
     }
@@ -188,8 +190,7 @@ public void testAttributes_emptyListUserSpecifiedAttributes() throws Exception {
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
         assertTrue(val.get(TEST_ATTRIBUTE_KEY).equals(TEST_ATTRIBUTE_VALUE));
     }
 
@@ -234,8 +235,7 @@ public void testAttribute_singleUserDefinedAttribute() throws Exception {
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
         assertTrue(val.get(TEST_ATTRIBUTE_KEY).equals(TEST_ATTRIBUTE_VALUE));
         assertTrue(val.size() == 1);
     }
@@ -262,8 +262,7 @@ public void testAttribute_singleUserDefinedAttributeWithWhiteSpace() throws Exce
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
         assertTrue(val.get(TEST_ATTRIBUTE_KEY).equals(TEST_ATTRIBUTE_VALUE));
         assertTrue(val.size() == 1);
     }
@@ -290,8 +289,7 @@ public void testAttribute_singleNonExistingUserDefinedAttribute() throws Excepti
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
 
         //If a Attribute is requested but does not exist then it is placed in the JSON with an empty string
         assertTrue(val.get("NonExistingAttribute").equals(""));
@@ -320,8 +318,7 @@ public void testAttribute_noIncludeCoreAttributesUserDefined() throws IOExceptio
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
         assertEquals(TEST_ATTRIBUTE_VALUE, val.get(TEST_ATTRIBUTE_KEY));
         assertEquals(TEST_ATTRIBUTE_VALUE, val.get(CoreAttributes.PATH.key()));
         assertEquals(2, val.size());
@@ -349,8 +346,7 @@ public void testAttribute_noIncludeCoreAttributesRegex() throws IOException {
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(json, HashMap.class);
+        Map<String, String> val = MAPPER.readValue(json, HashMap.class);
         assertEquals(TEST_ATTRIBUTE_VALUE, val.get(CoreAttributes.PATH.key()));
         assertEquals(1, val.size());
     }
@@ -372,8 +368,7 @@ public void testAttribute_noIncludeCoreAttributesContent() throws IOException {
         testRunner.assertTransferCount(AttributesToJSON.REL_SUCCESS, 1);
         testRunner.assertTransferCount(AttributesToJSON.REL_FAILURE, 0);
 
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, String> val = mapper.readValue(testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS).get(0).toByteArray(), HashMap.class);
+        Map<String, String> val = MAPPER.readValue(testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS).get(0).toByteArray(), HashMap.class);
         assertEquals(TEST_ATTRIBUTE_VALUE, val.get(TEST_ATTRIBUTE_KEY));
         assertEquals(1, val.size());
     }
@@ -399,7 +394,7 @@ public void testAttribute_includeCoreAttributesContent() throws IOException {
 
         assertEquals(AttributesToJSON.APPLICATION_JSON, flowFile.getAttribute(CoreAttributes.MIME_TYPE.key()));
 
-        Map<String, String> val = new ObjectMapper().readValue(flowFile.toByteArray(), HashMap.class);
+        Map<String, String> val = MAPPER.readValue(flowFile.toByteArray(), HashMap.class);
         assertEquals(3, val.size());
         Set<String> coreAttributes = Arrays.stream(CoreAttributes.values()).map(CoreAttributes::key).collect(Collectors.toSet());
         val.keySet().forEach(k -> assertTrue(coreAttributes.contains(k)));
@@ -425,7 +420,7 @@ public void testAttribute_includeCoreAttributesAttribute() throws IOException {
 
         assertNull(flowFile.getAttribute(CoreAttributes.MIME_TYPE.key()));
 
-        Map<String, String> val = new ObjectMapper().readValue(flowFile.getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME), HashMap.class);
+        Map<String, String> val = MAPPER.readValue(flowFile.getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME), HashMap.class);
         assertEquals(3, val.size());
         Set<String> coreAttributes = Arrays.stream(CoreAttributes.values()).map(CoreAttributes::key).collect(Collectors.toSet());
         val.keySet().forEach(k -> assertTrue(coreAttributes.contains(k)));
@@ -455,7 +450,7 @@ public void testAttributesRegex() throws IOException {
 
         MockFlowFile flowFile = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS).get(0);
 
-        Map<String, String> val = new ObjectMapper().readValue(flowFile.getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME), HashMap.class);
+        Map<String, String> val = MAPPER.readValue(flowFile.getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME), HashMap.class);
         assertTrue(val.keySet().contains("delimited.header.column.1"));
         assertTrue(val.keySet().contains("delimited.header.column.2"));
         assertTrue(val.keySet().contains("delimited.header.column.3"));
@@ -485,7 +480,7 @@ public void testAttributeWithNestedJsonOutputAsJsonInContent(String nestedJson,
         List<MockFlowFile> flowFilesForRelationship = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS);
         MockFlowFile flowFile = flowFilesForRelationship.get(0);
         assertEquals(AttributesToJSON.APPLICATION_JSON, flowFile.getAttribute(CoreAttributes.MIME_TYPE.key()));
-        Map<String, Object> val = new ObjectMapper().readValue(flowFile.toByteArray(), Map.class);
+        Map<String, Object> val = MAPPER.readValue(flowFile.toByteArray(), Map.class);
         assertInstanceOf(expectedClass, val.get(TEST_ATTRIBUTE_KEY));
     }
 
@@ -516,8 +511,7 @@ public void testAttributeWithNestedJsonOutputAsJsonInAttribute(String nestedJson
 
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, Object> val = mapper.readValue(json, Map.class);
+        Map<String, Object> val = MAPPER.readValue(json, Map.class);
         assertInstanceOf(expectedClass, val.get(TEST_ATTRIBUTE_KEY));
     }
 
@@ -560,8 +554,34 @@ public void testAttributeWithNestedJsonOutputAsStringInAttribute(String nestedJs
 
         String json = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS)
                 .get(0).getAttribute(AttributesToJSON.JSON_ATTRIBUTE_NAME);
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, Object> val = mapper.readValue(json, Map.class);
+        Map<String, Object> val = MAPPER.readValue(json, Map.class);
         assertInstanceOf(String.class, val.get(TEST_ATTRIBUTE_KEY));
     }
+
+    @Test
+    public void testAttributeWithJsonBetweenLeadingAndTrailingSpaces() throws JsonProcessingException {
+        final String jsonBetweenLeadingAndTrailingSpaces = "\n{\n" +
+                "    \"fruit\": \"Apple\",\n" +
+                "    \"size\": \"Large\",\n" +
+                "    \"color\": \"Red\"\n" +
+                "}\n";
+        assertDoesNotThrow(() -> MAPPER.readValue(jsonBetweenLeadingAndTrailingSpaces, Map.class));
+
+        final TestRunner testRunner = TestRunners.newTestRunner(new AttributesToJSON());
+        testRunner.setProperty(AttributesToJSON.DESTINATION, AttributesToJSON.DESTINATION_CONTENT);
+        testRunner.setProperty(AttributesToJSON.JSON_HANDLING_STRATEGY,
+                AttributesToJSON.JsonHandlingStrategy.NESTED.getValue());
+
+        ProcessSession session = testRunner.getProcessSessionFactory().createSession();
+        FlowFile ff = session.create();
+        ff = session.putAttribute(ff, TEST_ATTRIBUTE_KEY, jsonBetweenLeadingAndTrailingSpaces);
+        testRunner.enqueue(ff);
+        testRunner.run();
+
+        testRunner.assertTransferCount(AttributesToJSON.REL_FAILURE, 0);
+        testRunner.assertTransferCount(AttributesToJSON.REL_SUCCESS, 1);
+        MockFlowFile result = testRunner.getFlowFilesForRelationship(AttributesToJSON.REL_SUCCESS).get(0);
+        Map<String, Object> attributes = MAPPER.readValue(result.getContent(), Map.class);
+        assertInstanceOf(Map.class, attributes.get(TEST_ATTRIBUTE_KEY));
+    }
 }