Export One Object with Mongoexport, How to Specify _Id?

You have to specify the _id field by using the ObjectId type. In your question it was specified as a string.

CODE ::

mongoexport -h localhost -d my_database -c sample_collection -q '{key:ObjectId("50584580ff0f089602000155")}' -o my_output_file.json

NOTE :: dont forgot quotes in query

My MongoDB verion: 3.2.4. when I use mongoexport tool in mongo shell：

NOT WORK:

-q '{"_id":ObjectId("5719cd12b1168b9d45136295")}'

-q '{_id: {"$oid": "5719cd12b1168b9d45136295"}}'

WORKs:

-q "{_id:ObjectId('5719cd12b1168b9d45136295')}"

- Though in mongo doc , it says that

You must enclose the query in single quotes (e.g. ') to ensure that it does not interact with your shell environment.

- But, single quote(') does not work! please use double quote(")!

for mongoexport version: r4.2.3

mongoexport -q '{"_id": {"$oid": "4e3ca3bc38c4f10adf000002"}}' 

and for a nested field

mongoexport -q '{"_id": {"$oid": "4e3ca3bc38c4f10adf000002"}}' --fields parentField.childField

You do not have to add ObjectId or $oid as suggested by answers above. As has been mentioned by @Blacksad, just get your single and double quotes right.

mongoexport -d kb_development -c articles -q '{_id:"4e3ca3bc38c4f10adf000002"}'

many of the answers provided here didn't work for me, the error was with my double quotes. Here is what worked for me:

mongoexport -h localhost -d database_name -c collection_name -q {_id:ObjectId('50584580ff0f089602066633')} -o output_file.json

remember to use single quote only for the ObjectId string.