Handle url parameters in an HTTP endpoint

Problem

You want to create a single HTTP endpoint that can handle requests where parts of the path are set per-request.

For example, a single endpoint that can handle requests to both:

http://example.com/hello-param/Nick
http://example.com/hello-param/Dave

Solution

Use named path parameters in your HTTP In node’s URL property and then access the specific value provided in a request using the msg.req.params property of the message.

Flow

Example

[~]$ curl http://localhost:1880/hello-param/Nick
<html>
    <head></head>
    <body>
        <h1>Hello Nick!</h1>
    </body>
</html>

Discussion

Named path parameters in the URL property can be used to identify parts of the path that can vary between requests.

The msg.req.params property is an object of key/value pairs for each path parameter.

In the above example, the node is configured with a URL of /hello-params/:name, so a request to /hello-param/Nick results in the msg.req.params property containing:

{
    "name": "Nick"
}
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