Can't use .length in my array data

General
1

in my array has two data. but node script can't length it
Data :
image

{"rootId":"0759da852d9fb76f79297e8cfc3d6ce7","requestId":"f396bc7dc58796e5:-644c5706:176e12ece07:-8000:3924","details":{"tlp":2,"caseTemplate":null,"description":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66 at 2021-01-24T03:32:04","tags":["Logthyrhm","Automate"],"lastSyncDate":1611600578646,"customFields":{"alertRule":{"order":0,"string":"AIE: TLI - Command Shell Possible Success"},"application":{"order":1,"string":""},"destinationPort":{"order":3,"string":"80"},"sourcePort":{"order":2,"string":"80"}},"status":"New","severity":2,"title":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66","follow":true},"operation":"Creation","objectId":"0759da852d9fb76f79297e8cfc3d6ce7","startDate":1611600578713,"objectType":"alert","base":true,"object":{"_routing":"0759da852d9fb76f79297e8cfc3d6ce7","date":1611600578000,"severity":2,"customFields":{"alertRule":{"order":0,"string":"AIE: TLI - Command Shell Possible Success"},"application":{"order":1,"string":""},"destinationPort":{"order":3,"string":"80"},"sourcePort":{"order":2,"string":"80"}},"caseTemplate":null,"_type":"alert","description":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66 at 2021-01-24T03:32:04","lastSyncDate":1611600578646,"source":"172.25.5.20","title":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66","type":"Attack","follow":true,"tags":["Logthyrhm","Automate"],"createdAt":1611600578646,"_parent":null,"createdBy":"apiuser","tlp":2,"_id":"0759da852d9fb76f79297e8cfc3d6ce7","id":"0759da852d9fb76f79297e8cfc3d6ce7","sourceRef":"aa51b4","_version":1,"artifacts":[{"tlp":2,"tags":[],"data":"27.75.99.4","ioc":false,"sighted":false,"message":null,"dataType":"ip"},{"tlp":2,"tags":[],"data":"113.53.233.66","ioc":false,"sighted":false,"message":null,"dataType":"ip"}],"status":"New"}}

My code
image

what's wrong ?

2

Not sure as can not see the objects origin in the image, but maybe it's msg.artifacts

3 
{"rootId":"0759da852d9fb76f79297e8cfc3d6ce7","requestId":"f396bc7dc58796e5:-644c5706:176e12ece07:-8000:3924","details":{"tlp":2,"caseTemplate":null,"description":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66 at 2021-01-24T03:32:04","tags":["Logthyrhm","Automate"],"lastSyncDate":1611600578646,"customFields":{"alertRule":{"order":0,"string":"AIE: TLI - Command Shell Possible Success"},"application":{"order":1,"string":""},"destinationPort":{"order":3,"string":"80"},"sourcePort":{"order":2,"string":"80"}},"status":"New","severity":2,"title":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66","follow":true},"operation":"Creation","objectId":"0759da852d9fb76f79297e8cfc3d6ce7","startDate":1611600578713,"objectType":"alert","base":true,"object":{"_routing":"0759da852d9fb76f79297e8cfc3d6ce7","date":1611600578000,"severity":2,"customFields":{"alertRule":{"order":0,"string":"AIE: TLI - Command Shell Possible Success"},"application":{"order":1,"string":""},"destinationPort":{"order":3,"string":"80"},"sourcePort":{"order":2,"string":"80"}},"caseTemplate":null,"_type":"alert","description":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66 at 2021-01-24T03:32:04","lastSyncDate":1611600578646,"source":"172.25.5.20","title":"AIE: TLI - Command Shell Possible Success from 27.75.99.4 to 113.53.233.66","type":"Attack","follow":true,"tags":["Logthyrhm","Automate"],"createdAt":1611600578646,"_parent":null,"createdBy":"apiuser","tlp":2,"_id":"0759da852d9fb76f79297e8cfc3d6ce7","id":"0759da852d9fb76f79297e8cfc3d6ce7","sourceRef":"aa51b4","_version":1,"artifacts":[{"tlp":2,"tags":[],"data":"27.75.99.4","ioc":false,"sighted":false,"message":null,"dataType":"ip"},{"tlp":2,"tags":[],"data":"113.53.233.66","ioc":false,"sighted":false,"message":null,"dataType":"ip"}],"status":"New"}}

it's all object

4 
msg.payload.object.artifacts

Read this it will tell you how to find paths, using the debug panel.
https://nodered.org/docs/user-guide/messages#understanding-the-structure-of-a-message

5

it's still same
image

6

Then you are not showing the whole object, is object living inside msg.payload or in just msg ?

7

Feed the incoming message into a debug node set to show Complete Message and post a screenshot here. Then we will understand what you have.
Have you read and understood the document linked earlier?