Custom action

Hi.
I configured new action in order to send an api request to my server.
all working fine, but i want to get the value changed in column i changed but i get “columnValue: [Object]”:

[0] payload: {
[0] blockKind: ‘action’,
[0] inboundFieldValues: {
[0] itemId: 1388903175,
[0] boardId: 1388903151,
[0] columnId: ‘text’,
[0] columnValue: [Object],
[0] columnValue2: [Object],
[0] userId: 53726878
[0] },
[0] inputFields: {
[0] itemId: 1388903175,
[0] boardId: 1388903151,
[0] columnId: ‘text’,
[0] columnValue: [Object],
[0] columnValue2: [Object],
[0] userId: 53726878
[0] },
[0] recipeId: 30204929,
[0] integrationId: 84464654

what am i doing wrong?