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    "title": "Amazon KDP Profitable Niche Detector & BSR Sales Calculator",
    "description": "Uncover high-demand, low-competition Amazon KDP book niches in seconds. Analyzes Best Sellers Rank (BSR), calculates daily/monthly royalties, flags low review barriers, and scores niche profitability.",
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            "default": [
              "coloring books for adults",
              "anxiety journal",
              "daily habit tracker"
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              "amazon.de",
              "amazon.ca"
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            "type": "string",
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            "minimum": 35,
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