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Serving HTML and JSON Responses

Explore how to create a Node.js web server that sends HTML and JSON responses by setting appropriate Content-Type headers and HTTP status codes. Understand handling different routes and dynamically generating HTML from JSON data, while managing client requests and errors effectively.

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In modern applications, servers need to handle diverse content types. For example, HTML is used for rendering web pages, and JSON is used for exchanging structured data, commonly in APIs. To handle these use cases, servers must include headers to specify the format of their responses.

The Content-Type header in HTTP responses is particularly important as it tells clients (like browsers or API consumers) how to interpret the returned data. For example:

  • text/html specifies HTML content for rendering web pages.

  • application/json denotes structured data formatted as JSON.

  • text/plain indicates plain text.

Setting the correct Content-Type helps clients correctly interpret the response and is the standard way to describe the payload format.

Building a server for HTML and JSON responses

Let’s create a server that responds with HTML content for one route and JSON data for another. To set the appropriate headers for each response, we’ll ...