JSON isn't an image
A .json file stores text data — settings, coordinates, lists — not pixels. There's no image inside to extract, and a picture can't be saved as a JSON data file.
Looking to turn a PDF into JSON? Here's the honest answer — and the conversions that actually work.
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PDF is the universal document format that preserves layout on every device — images are often converted to PDF for sharing and printing.
PDF opens in every browser and PDF reader.
No — JSON is a data format, not an image, so there's nothing to convert. You can convert your PDF to TIFF or PNG instead.
JSON is a text-based data format used for app settings and, with a matching image, sprite-sheet coordinates. It isn't a picture.
A sprite sheet is a .png + .plist pair. Use a texture packer (TexturePacker, Cocos2d) to pack or unpack them together; a single-file converter can't.