[LOG]nodejs / express related

- doc: ``google drive/computer``
- virtual: ``docker-compose``
- backup: ``mega.nz``
- api dev: ``express / nodemon + (mockaroo) + postman``
- db: ``postgres / pgadmin``
- front dev: ``vue / vue-cli+ semantic ui``

### validator

- [How to use Express-Validator 5.x](https://charlietheprogrammer.com/how-to-use-express-validator-5/)
- [how to show only one validation error message per field](https://github.com/express-validator/express-validator/issues/235)
- [validation confirm password](https://stackoverflow.com/questions/46011563/access-request-body-in-check-function-of-express-validator-v4/46013025#46013025)

### crypto

- [Node JS | Password Hashing with Crypto module](https://www.geeksforgeeks.org/node-js-password-hashing-crypto-module/)

### postgres
- [duplicate pkey error when inserting a new records to a restored database](https://bit.ly/2GaDXlo)

``SELECT setval('table_id_seq', (SELECT max(id) FROM table));``

## summary

### express

```js
// index.js routes
fs.readdirSync(path.join(__dirname, 'routes')).forEach((routeFileName) => {
  if (/\.js$/.test(routeFileName)) {
    require(`./routes/${routeFileName}`)(app)
  }
})
```
#### Package
- request:  **bodyParser** 
- validate:  **express-validator**
- postgres: **pg**
- md5 password: **crypto**

```js
// crypto
var crypto = require('crypto');
var hash = crypto.createHash('md5').update(user.password).digest("hex");
```

## Library

- [Node.js で Cloud Storage を使用する](https://cloud.google.com/nodejs/getting-started/using-cloud-storage?hl=ja)

## Deployment

- [Express Deploy Tutorial ](https://developer.mozilla.org/ja/docs/Learn/Server-side/Express_Nodejs/deployment)