JSON Key Renamer
Paste JSON and a list of old → new key names, and rename matching object keys at every nesting level — values are never touched.
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About this tool
Walks the entire JSON structure recursively — objects nested inside arrays, inside other objects, at any depth — and renames any object key that exactly matches one of your rules. Only the keys themselves are renamed; string values are never altered, even if a value happens to match one of the old key names.