Não consigo importar json com Mongo no windows

Meu arquivo está na pasta db que criamos na primeira aula, numa pasta chamada files.

Quando uso o comando

 mongoimport --jsonArray --collection alunos --file <caminho do arquivo>.json

Eu recebo a seguinte mensagem:

D:\EstudoDeProgramacao\NodeJS\MongoDB\ProjetoAula\db>mongoimport --jsonArray --collection alunos --file D:\EstudoDeProgramacao\NodeJS\MongoDB\ProjetoAula\db\files\alunos.json
2019-09-12T19:09:31.621-0300    connected to: mongodb://localhost/
2019-09-12T19:09:31.668-0300    Failed: invalid JSON input
2019-09-12T19:09:31.668-0300    0 document(s) imported successfully. 0 document(s) failed to import.

Meu mongoimport version é o 4.2 e essa é a saida verbosa de segundo nível:

2019-09-12T19:21:54.598-0300    using write concern: &{majority false 0}
2019-09-12T19:21:54.644-0300    using 8 decoding workers
2019-09-12T19:21:54.644-0300    using 1 insert workers
2019-09-12T19:21:54.644-0300    will listen for SIGTERM, SIGINT, and SIGKILL
2019-09-12T19:21:55.251-0300    filesize: 1929 bytes
2019-09-12T19:21:55.251-0300    using fields:
2019-09-12T19:21:55.252-0300    connected to: mongodb://localhost/
2019-09-12T19:21:55.252-0300    ns: test.alunos
2019-09-12T19:21:55.252-0300    connected to node type: standalone
2019-09-12T19:21:55.252-0300    Failed: invalid JSON input
2019-09-12T19:21:55.252-0300    0 document(s) imported successfully. 0 document(s) failed to import.