spotify-manager/validators/index.js

import { validationResult } from "express-validator";

import * as typedefs from "../typedefs.js";
import { getNestedValuesString } from "../utils/jsonTransformer.js";
import curriedLogger from "../utils/logger.js";
const logger = curriedLogger(import.meta);

/**
 * Refer: https://stackoverflow.com/questions/58848625/access-messages-in-express-validator
 *
 * @param {typedefs.Req} req
 * @param {typedefs.Res} res
 * @param {typedefs.Next} next
 */
export const validate = (req, res, next) => {
  const errors = validationResult(req);
  if (errors.isEmpty()) {
    return next();
  }

  const extractedErrors = [];
  errors.array().forEach(err => {
    if (err.type === "alternative") {
      err.nestedErrors.forEach(nestedErr => {
        extractedErrors.push({
          [nestedErr.path]: nestedErr.msg
        });
      });
    } else if (err.type === "field") {
      extractedErrors.push({
        [err.path]: err.msg
      });
    }
  });

  res.status(400).json({
    message: getNestedValuesString(extractedErrors),
    errors: extractedErrors
  });
  logger.warn("invalid request", { extractedErrors });
  return;
}