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Allow filtering, sorting, and pagination

Pragya Keshap answered on February 21, 2023 Popularity 5/10 Helpfulness 1/10

answer Allow filtering, sorting, and pagination

Allow filtering, sorting, and pagination

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The databases behind a REST API can get very large. Sometimes, there’s so much data that it shouldn’t be returned all at once because it’s way too slow or will bring down our systems. Therefore, we need ways to filter items.

We also need ways to paginate data so that we only return a few results at a time. We don’t want to tie up resources for too long by trying to get all the requested data at once.

Filtering and pagination both increase performance by reducing the usage of server resources. As more data accumulates in the database, the more important these features become

const express = require('express');
const bodyParser = require('body-parser');

const app = express();

// employees data in a database
const employees = [
  { firstName: 'Jane', lastName: 'Smith', age: 20 },
  //...
  { firstName: 'John', lastName: 'Smith', age: 30 },
  { firstName: 'Mary', lastName: 'Green', age: 50 },
]

app.use(bodyParser.json());

app.get('/employees', (req, res) => {
  const { firstName, lastName, age } = req.query;
  let results = [...employees];
  if (firstName) {
    results = results.filter(r => r.firstName === firstName);
  }

  if (lastName) {
    results = results.filter(r => r.lastName === lastName);
  }

  if (age) {
    results = results.filter(r => +r.age === +age);
  }
  res.json(results);
});

app.listen(3000, () => console.log('server started'));

https://stackoverflow.blog/2020/03/02/best-practices-for-rest-api-design/

Popularity 5/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript pagination

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Contributed on Feb 21 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Allow filtering, sorting, and pagination

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