GoQuery is a library for the Go programming language that provides a set of features for traversing and manipulating HTML documents, similar to jQuery in JavaScript. It is primarily used for parsing HTML and does not have direct capabilities to parse JSON. However, if JSON is embedded within an HTML document, you can use GoQuery to extract the portion of HTML that contains the JSON string and then use Go's encoding/json package to parse the JSON.
Here's a step-by-step guide on how to use GoQuery to scrape and parse JSON embedded in HTML:
Load the HTML document: Use GoQuery to load and parse the HTML from a string, file, or HTTP response.
Find and extract the JSON: Use GoQuery's DOM traversal and manipulation methods to find the HTML element that contains the JSON string.
Parse the extracted JSON: Use Go's built-in
encoding/jsonpackage to unmarshal the JSON string into a Go data structure.
Here's an example of how you might accomplish this in Go:
package main
import (
"encoding/json"
"fmt"
"log"
"strings"
"github.com/PuerkitoBio/goquery"
)
func main() {
// Example HTML with embedded JSON
html := `
<html>
<head>
<title>Example Page</title>
</head>
<body>
<script id="json-data" type="application/json">
{
"name": "John Doe",
"age": 30
}
</script>
</body>
</html>
`
// Load the HTML document
doc, err := goquery.NewDocumentFromReader(strings.NewReader(html))
if err != nil {
log.Fatal(err)
}
// Find the script tag with the JSON content
scriptTag := doc.Find("#json-data").First()
if scriptTag.Length() == 0 {
log.Fatal("JSON data not found")
}
// Extract the JSON string from the script tag
jsonStr := scriptTag.Text()
// Prepare a map to hold the JSON data
var data map[string]interface{}
// Unmarshal the JSON string into the map
if err := json.Unmarshal([]byte(jsonStr), &data); err != nil {
log.Fatal(err)
}
// Print the extracted data
fmt.Printf("Extracted JSON data: %+v\n", data)
}
In this example, the HTML contains a script tag with type="application/json" which holds the JSON data. We use GoQuery to find this tag by its ID and extract the text content, which should be a valid JSON string.
After extracting the JSON string, we parse it into a Go map using the json.Unmarshal function. You can unmarshal the JSON into an appropriate Go type that matches the structure of the JSON data.
Please note that this example assumes that the JSON is embedded in a straightforward way within the HTML. In real-world scenarios, you may need to handle additional complexities such as JSON escaping or more complex HTML structures.
