23.02.2026
4 min
1
365
In the third part of our review, we’ve compiled a set of online tools for working with data formats, web requests, and configuration files. Here, you’ll find utilities for converting JSON, XML, TOML, and YAML, transforming Markdown into HTML, processing URLs, escaping HTML entities, and generating basic authentication headers. These tools are especially useful for developers, testers, DevOps engineers, and anyone working with APIs, configurations, or web integrations. Everything runs directly in your browser — no additional software required.
When you need to quickly convert JSON to TOML, this tool is a real lifesaver. There’s no need to manually rewrite the structure or worry about syntax. Just paste your data in and instantly see the result. It’s especially handy for configurations and testing, particularly when you don’t want to waste time on minor details.
It helps you work with lists — rearranging items, adding the same prefix or suffix to each line, or lightly formatting the data. It’s especially useful when you’re dealing with a large number of lines and don’t want to edit them one by one. Everything is done quickly and without unnecessary effort. Tools like this often save you during routine tasks.
Breaks a link down into its individual parts — protocol, domain, parameters, and other components. This makes it much easier to understand the structure of a request. It’s especially handy when checking integrations or running tests. You get a clear view of what exactly is inside the URL and how the server processes it. Particularly useful during debugging.
Another format converter that comes in handy for anyone working with configuration files. There’s no need to manually move nested blocks around or worry about indentation errors. Everything is handled automatically. Just paste your data in and get a ready-to-use result.
It’s useful when you need to adapt legacy or third-party data to modern APIs. Instead of manually restructuring nested data, you can handle it in just a few seconds. You immediately see what the final output will look like. Great for testing and quick validation.
If you need to switch back to XML, this tool handles it without any extra hassle. There’s no need to manually create tags or worry about nesting. Just paste in your JSON and get a ready-made XML file. It’s especially convenient when ensuring compatibility across different systems.
Converts Markdown into standard HTML so you can instantly see how the markup will look. It’s handy for articles, documentation, or technical notes. There’s no need to launch a separate editor — everything can be previewed right in your browser.
Helps you encode or decode text in URL format. If you see strange percent-encoded characters in a link, you can quickly figure out what’s actually inside. It’s useful when working with request parameters, especially during API debugging.
Allows you to replace special characters with HTML entities — or convert them back. This is useful when working with markup and you don’t want the text to break the page structure. Everything can be checked in seconds, with no need for complex tools.
A reverse conversion that’s often needed during integrations. If a system works with JSON but your data is in TOML, you can quickly convert the format without any manual adjustments. Nothing complicated — everything is kept as simple as possible.
Displays technical information about your device and browser. You can check your user agent, screen size, and other details. It’s useful for testing or compatibility checks. Everything is shown instantly, with no extra steps required.
Generates a Basic Authentication string from a username and password. It’s often needed when testing APIs. There’s no need to manually encode the credentials or build the header yourself. Everything is created automatically and ready to use.
