Req Query - Expressjs

<h3 id='req.query'>req.query</h3>

This property is an object containing a property for each query string parameter in the route. When query parser is set to disabled, it is an empty object {}, otherwise it is the result of the configured query parser.

<div class="doc-box doc-warn" markdown="1"> As `req.query`'s shape is based on user-controlled input, all properties and values in this object are untrusted and should be validated before trusting. For example, `req.query.foo.toString()` may fail in multiple ways, for example `foo` may not be there or may not be a string, and `toString` may not be a function and instead a string or other user-input. </div>

The value of this property can be configured with the query parser application setting to work how your application needs it. A very popular query string parser is the qs module, and this is used by default. The qs module is very configurable with many settings, and it may be desirable to use different settings than the default to populate req.query:

const qs = require('qs')
app.set('query parser',
  (str) => qs.parse(str, { /* custom options */ }))

Check out the query parser application setting documentation for other customization options.