A JavaScript file that aims to remove a lot of the boilerplate code that typically emerges in route functions in Express.js/MongoDB server projects.

express_mongo_route_builder.js

// Example handlers - change this to your own handler functions if necessary
const handleSuccess = (res, data) => res.status(200).send(data);
const handleError = (res, err) => res.status(400).send(err);

// Generic template for requests not covered by other functiomns
exports.generic = async (model, func, res, method, ...args) => {
  try {
    const obj = await model[func](...args);

        handleSuccess(res, obj, method);
    } catch (err) {
        handleError(res, err);
    }
}

exports.post = async (model, res, payload) => {
  try {
    const obj = new model(payload);
    await obj.save();

    handleSuccess(res, obj, "POST");
  } catch (err) {
    handleError(res, err);
  }
};

exports.getAll = async (model, res, query, fieldsToReturn) => {
  try {
    let obj;

    if (fieldsToReturn) {
      fieldsToReturn = fieldsToReturn.reduce((fields, field) => {
        fields[field] = 1;
        return fields;
      }, {});

      obj = await model.find(query || {}, fieldsToReturn);
    } else {
      obj = await model.find(query || {});
    }

    handleSuccess(res, obj, "GET");
  } catch (err) {
    handleError(res, err);
  }
};

exports.getOne = async (model, res, query, fieldsToReturn) => {
  try {
    const obj = fieldsToReturn
      ? await model.findOne(query, fieldsToReturn)
      : await model.findOne(query);

    handleSuccess(res, obj, "GET");
  } catch (err) {
    handleError(res, err);
  }
};

exports.put = async (model, res, query, payload) => {
  for (let prop in payload) {
    if (!payload[prop]) delete payload[prop];
  }

  try {
    const obj = await model.findOneAndUpdate(query, payload, { new: true });

    handleSuccess(res, obj, "PUT");
  } catch (err) {
    handleError(res, err);
  }
};

exports.delete = async (model, res, query) => {
  try {
    const obj = await model.findOneAndDelete(query);

        handleSuccess(res, obj, "DELETE");
    } catch (err) {
        handleError(res, err);
    }
};