Toolaska

Pros: I’ve been using Toolaska JSON Tool
for a while, and it has become one of my go-to utilities whenever I need to work with JSON. The interface is clean, lightweight, and fast — no unnecessary clutter.

What I like the most:

Format & Beautify: Makes even the messiest JSON instantly readable.

Minify: Perfect for compressing before pushing to production.

Validate: Quickly catches mistakes in JSON structure.

Convert JSON ↔ CSV / XML / YAML: Saves a ton of time when working across formats.

Escape / Unescape: Very useful for preparing JSON for APIs.

Sort Keys: Keeps my files consistent and easier to manage.

Download / Copy: No hassle in exporting results.

Save Recent JSON: It remembers my last 10 JSON files locally, which is super handy when switching between tasks.

The fact that it’s free, ad-free, and doesn’t require login makes it even better. Everything runs directly in the browser, so it’s quick and private.

Cons: Limited to JSON-related tasks → It doesn’t support other data formats (like TOML, INI, etc.) that some developers might use.

No collaboration features → Everything is local, so you can’t share JSON edits or sessions directly with teammates.

Local-only storage → The “recent JSON” feature only works in the same browser/device (no cloud sync).

Basic UI → Very clean and minimal, but may feel too simple compared to full IDE plugins or desktop apps.

No advanced JSON querying → Lacks features like JMESPath/JSONPath querying for deep data manipulation.

Offline use → Needs an internet connection since it’s a web app (unless cached in browser).

Overall: A must-have online tool for developers, especially those working with APIs and configs daily. I’d recommend it to anyone looking for a reliable, no-nonsense JSON utility.