After you have created a Node.js function project, you can modify the template files provided to add business logic to your function.
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Before you can develop functions, you must complete the steps in Setting up {FunctionsProductName}.
When using the kn CLI to create a function project, you can generate a project that responds to CloudEvents, or one that responds to simple HTTP requests. CloudEvents in Knative are transported over HTTP as a POST request, so both function types listen for and respond to incoming HTTP events.
Node.js functions can be invoked with a simple HTTP request. When an incoming request is received, functions are invoked with a context object as the first parameter.
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See the Node.js context object reference documentation.