expressjsHow do I use an express.js query parser?

Using an express.js query parser is a straightforward process. It involves the following steps:

1. Install the query parser module:

npm install express-query-parser

2. Require the module in your express.js application:

const queryParser = require('express-query-parser');

3. Use the query parser middleware in your application:

app.use(queryParser());

4. Access the query parameters in your request handlers:

app.get('/', (req, res) => {
  const { query } = req;
  console.log(query);
});

The query object in the request handler will contain all the query parameters parsed from the URL.

5. Optionally, you can also specify custom options when using the query parser:

app.use(queryParser({
  parseNull: true,
  parseBooleans: true
}));

The parseNull option will parse null values from the query parameters, while the parseBooleans option will parse boolean values from the query parameters.

6. Finally, you can also access the parsed query parameters from the req.query object:

app.get('/', (req, res) => {
  console.log(req.query);
});

This will give you access to the parsed query parameters in the request handler.

For more information, please refer to the express-query-parser documentation.

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