Data · free local utility
Beautify or minify JSON, locate syntax errors, inspect keys, values, depth, and UTF-8 size, then copy or download the checked payload.
Paste up to 500,000 characters of JSON, choose indentation, then format, minify, or validate it. Valid results include a structure summary and download.
{"status":"ok","items":[1,2]}Indented JSON · root object · 2 keys · 1 array · UTF-8 size summary
This validates JSON syntax and reports parser location when the browser exposes it. It does not repair invalid JSON or validate a schema; use the separate JSON Schema page for field rules.
Always verify the result in the system where you will use it. The page intentionally avoids accounts, uploads, and claims that go beyond the calculation it performs.
No. Standard JSON does not allow comments or trailing commas, so they produce a parse error.
The payload is parsed and serialized as JSON. Whitespace changes, while valid JSON values and key order are generally retained by the browser parser.
The tool uses the parser's reported line, column, or character offset and shows a short local excerpt. Browsers that do not expose a location can only return the parser message.
The root is depth 0. Each nested object or array increases the maximum depth by one.
Local processing reduces exposure, but the safest choice is to remove tokens, credentials, and personal data before pasting content anywhere.
Browse every json & data tools in this workflow.