However, JSON data is not readable by developers without a JSON viewer that structures and displays the data in a clear way. As such, Mozilla has incorporated a JSON viewer in Firefox.

Why is JSON viewer not working in Firefox?

The native JSON viewer on Firefox may not work correctly for various reasons. It may be any of the following ones:

The server is not sending a valid Application/JSON header as it should The JSON viewer is disabled Third-party service is interfering with something

What is the best JSON viewer? Most JSON viewers are great. It is hard to determine which one is best. However, if you want to view JSON online, you may consider using JSONViewer.Stack.Hu. Whatever the reason is, you can always fix JSON-related problems on Firefox by yourself. For more information about that, check the guide below. Note: The following steps are equally helpful if you were looking for the following issues:

Firefox JSON viewer not working Firefox JSON extension Mozilla JSON viewer Firefox JSON expand all

How do I fix JSON viewer on Firefox?

1. Consider using a different browser

Before trying any of the troubleshooting solutions below, we would first like to suggest that you consider using a different browse entirely. For example, Opera is an excellent choice for use if you are interested in JSON Viewer since it also comes with its own JSON extension called JSON Lite. The browser has proven itself to be far more stable and reliable than the Firefox variant. More so, Opera is a great web browser as a whole, featuring an incredibly modern UI with high levels of customization. It has a built-in VPN and ad-blocker, and it is based on the Chromium engine, making it compatible with extensions from both Chrome and Edge as well.

2. Enable JSON Viewer in Firefox

If Firefox’s JSON viewer isn’t working for you, that may be because it’s not enabled. At the moment, the data viewer is only enabled by default in Developer Edition and Nightly.

3. Try alternative JSON Viewer add-ons and web tools

3.1 JSONView

This extension filters JSON syntax and structures it so you can easily read the data in Firefox.

3.2 JSON-Data View

The JSON-DataView also includes customization options that you can select by following the steps below:

3.3 JSON web viewer

3.4 JSON Editor Online

The JSON Editor Online is another web tool you can display data from HDD or URL. You just need to open the web tool and copy-paste the sample data above into the code editor. Press the right arrow button to copy the code into the tree editor, and then click the left arrow button to display the JSON data as shown below. There, you can edit the data and save any changes made. The page also includes a handy search tool for fields and values.

How do I make a JSON file readable?

A raw JSON file can confuse anyone. If you want to see a JSON file in human-readable format, you must use a JSON viewer. The Mozilla Firefox browser is an excellent tool to do it. However, alternatively, you can use NotePad, NotePad++, and many other offline software and JSON viewers to make JSON File readable. The built-in Firefox viewer doesn’t do everything you need if you need a JSON viewer. JSON addons, web tools, and extensions for Firefox are great alternatives for developers who need to open and edit JSON data. Hope that this was helpful and you’re now aware of the different JSON addons and web tools you can use. If you have any more questions, feel free to reach for the comments section below.

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