How Data Parsing Works

What is parsing

Parsing is the process of extracting the necessary information from web pages or other data sources. The goal of parsing is to convert unstructured data into a convenient format for further work.

What types of parsing exist

API-based parsing

Many websites provide an API — a set of ready-made methods for data extraction. This is the simplest way to parse data.

Regular expressions

Regular expressions allow you to extract data based on predefined patterns. They are effective for small volumes of structured data.

XPath

A query language for working with XML and HTML documents. It is used to extract content from web pages.

DOM-based parsing

Converting HTML into a document object model. Then, queries are applied to DOM elements using JavaScript.

How the parsing process works

1. The target resource and the type of content to be extracted are determined.
2. A suitable parsing method is selected.
3. A parser — a program for data extraction — is developed.
4. The parser sends requests to the resource and extracts the data.
5. The extracted content is converted into the required format.
6. Parsing results are saved in a database.

Thus, this process is an important tool for obtaining and analyzing large volumes of web data.

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