let exec = require('child_process').exec;
exec(`node ./node_modules/mongodb-migrate -runmm -dbc '{"host":"localhost","db":"myDb","port":27017,"username":"user1","password":"pswd1"}' up`,
  (error, stdout, stderr) => {
  if (error) {
    console.error(`exec error: ${error}`);
    return;
  }
    console.log(`${stdout}`);
    console.log(`${stderr}`);
});

exec error: Error: Command failed: node ./node_modules/mongodb-migrate -runmm -dbc '{"host":"localhost","db":"myDb","port":27017,"username":"user1","password":"pswd1"}' up
    undefined:1
    '{host:localhost,db:myDb,port:27017,username:user1,password:pswd1}'
    ^

    SyntaxError: Unexpected token h in JSON at position 0