About this tool
Paste JSON to pretty-print it with 2-space, 4-space or tab indentation, or minify it to a single line. The collapsible tree view lets you explore deeply nested objects and arrays without scrolling through raw text, with values colour-coded by type.
Everything runs client-side in JavaScript, so config files, API responses and payloads containing credentials never leave your machine — there is no server round-trip and nothing is logged.
If the document does not parse, the status line names the line and column and explains the likely cause; the JSON Validator is the page built around that job.