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Showing content from https://learn.microsoft.com/en-us/microsoft-edge/devtools-guide-chromium/json-viewer/json-viewer below:

View a JSON file or server response with formatting

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To display a minified JSON file or a minified JSON server response in a more readable format, select the Pretty-print checkbox.

When you open a JSON file or view a JSON HTTP server response in Microsoft Edge, the content is initially displayed as-is:

If the JSON content has been minified, with its entire content on a single line with empty spaces removed, the JSON is initially displayed in a dense format, wrapped to the window.
If the JSON was formatted with line breaks and indentation, the JSON is displayed as formatted.

To format a minified JSON file or server response:

Open a .json file that's minified, such as 128KB-min.json, or go to a URL that returns a minified JSON response.

To open a local JSON file, press Ctrl+O on Windows and Linux, or Command+O on macOS, and then select a JSON file.

The minified JSON is initially displayed in a dense format, wrapped to the window:
Select the Pretty-print checkbox:

The JSON file or response is displayed in a readable format, with indentation and line wrapping based on the JSON object content.

Selecting or clearing the Pretty-print checkbox doesn't change the JSON file itself; only how it is displayed.