About: Paste or type JSON to validate and format it live; parse errors are reported with line and column positions. Decode literal \uXXXX escapes left by double escaping and %XX (URL) percent encoding in string values with one click. The tree view matches the formatted text line by line (each level has its own closing-bracket line; array indexes and counts are hidden by default and can be enabled in the viewer toolbar). Expand/collapse levels, hover to highlight a whole subtree, copy a node, subtree, or JSONPath, and search keys and values. Everything runs locally in your browser; no data is uploaded.

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