How can I view JSON in Firefox? The fastest way to view and edit JSON data in Firefox is the built-in JSON viewer. The data viewer is enabled by default only in the Developer and Nighly versions. If this doesn’t work for you, use some useful Firefox add-ons and web tools.

For more information, see the tutorial below.

Note: The following steps are also helpful if you are seeking answers to the following questions:

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How do I fix the JSON viewer in Firefox?

1. consider using a different browser

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Before you try any of the troubleshooting solutions below, we recommend that you use a different point of view.

Opera, for example, is a good choice if you are interested in JSON Viewer, as it also has its own JSON extension called JSON Lite.

The browser has proven to be much more stable and reliable than the Firefox variant. Moreover, Opera is generally an excellent web browser with an incredibly modern user interface and a high level of customization options.

Perform a system check for possible errors

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Click the Start Scan button to detect problems with Windows.

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Click Fix All to correct problems related to proprietary technologies.

Scan the PC with Restoro Repair Tool to find errors that cause security problems and delays. Once the scan is complete, the repair process replaces damaged files with new Windows files and components.

It has an integrated VPN and ad blocker and is based on the Chromium engine, making it compatible with Chrome and Edge extensions.

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If you want to run a JavaScript object notation session in your browser, why not try this great tool?

2. enable JSON Viewer in Firefox

  1. First, type the following into the Firefox address bar: about:config
  2. Then press the Enter key to open the page shown in the following screenshot.
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  3. Then in the search box at the top of the about:config page, type: devtools.jsonview.enabled
  4. You can now double-click devtools.jsonview.enabled to change the value to True.
  5. This allows you to use the JSON viewer effectively in the Firefox browser.

If the Firefox JSON viewer does not work for you, it is probably because it is not enabled. Currently, the data viewer is only enabled by default in developer and nightly versions.

3. Try other JSON viewer plug-ins and other web tools.

  1. Add JSONView to Firefox by clicking the +Add to Firefox button on this page.
  2. Once you have added the add-on, open this page to see a sample of formatted JSON data.
  3. For that, you should have seen your data as such.
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  4. After installing the addon, it should look like this.
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JSON data type

  1. Go to this page and add the extension to your browser.
  2. Open the page again to check the formatting style of the JSON data.
  3. Data should now include + and – buttons to expand and collapse tree nodes, syntax highlighting and hyperlinks.

JSON DataView also includes configuration options that you can choose by following the next steps:

  1. Click on the “Open Menu” button in the upper right corner of your browser.
  2. Then click on “Extras.”
  3. Click the Options button next to JSON-DataView to open the windows below.
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JSON web viewer

  1. Copy and paste your data into the Text tab of this JSON viewer.
  2. Try copying and pasting the following JSON data using Ctrl + C and Ctrl + V: { “hi”: “guy”, “anumber”: 243, “anObject”: { “wow”: “nuts”, “anobject”: 1,2, “three”], “plus”: “trick”, “cool”: “true”, “false”: “false”, “value”: “zero”, “Japanese”: “明日がある。”, “link”: “”, “notLink”: “” }
  3. After you have copied the text, click the Format button.
  4. The data is then displayed as shown in the figure below.
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JSON online editor

Error: The file name is not specified.

JSON Editor Online is another web tool that allows you to view data from a disk or URL. Just open the web tool and copy and paste the above data examples into the code editor.

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