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* Update docs - start * Add logo & discord * Start updating docs for esm style imports * Update docs with logo & info on pooling * Update more import statements --------- Co-authored-by: Brian Carlson <brian.carlson@getcruise.com>
83 lines
2.3 KiB
Markdown
83 lines
2.3 KiB
Markdown
---
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title: Express with async/await
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---
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My preferred way to use node-postgres (and all async code in node.js) is with `async/await`. I find it makes reasoning about control-flow easier and allows me to write more concise and maintainable code.
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This is how I typically structure express web-applications with node-postgres to use `async/await`:
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```
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- app.js
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- index.js
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- routes/
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- index.js
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- photos.js
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- user.js
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- db/
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- index.js <--- this is where I put data access code
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```
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That's the same structure I used in the [project structure](/guides/project-structure) example.
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My `db/index.js` file usually starts out like this:
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```js
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import { Pool } from 'pg'
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const pool = new Pool()
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export const query = (text, params) => pool.query(text, params)
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```
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Then I will install [express-promise-router](https://www.npmjs.com/package/express-promise-router) and use it to define my routes. Here is my `routes/user.js` file:
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```js
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import Router from 'express-promise-router'
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import db from '../db.js'
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// create a new express-promise-router
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// this has the same API as the normal express router except
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// it allows you to use async functions as route handlers
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const router = new Router()
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// export our router to be mounted by the parent application
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export default router
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router.get('/:id', async (req, res) => {
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const { id } = req.params
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const { rows } = await db.query('SELECT * FROM users WHERE id = $1', [id])
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res.send(rows[0])
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})
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```
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Then in my `routes/index.js` file I'll have something like this which mounts each individual router into the main application:
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```js
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// ./routes/index.js
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import users from './user.js'
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import photos from './photos.js'
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const mountRoutes = (app) => {
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app.use('/users', users)
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app.use('/photos', photos)
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// etc..
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}
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export default mountRoutes
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```
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And finally in my `app.js` file where I bootstrap express I will have my `routes/index.js` file mount all my routes. The routes know they're using async functions but because of express-promise-router the main express app doesn't know and doesn't care!
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```js
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// ./app.js
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import express from 'express'
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import mountRoutes from './routes.js'
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const app = express()
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mountRoutes(app)
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// ... more express setup stuff can follow
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```
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Now you've got `async/await`, node-postgres, and express all working together!
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