JSON formatter
Pretty-print, minify, and validate JSON, with the exact line and column when it fails.
Use from your agent
Streamable HTTP at https://benchline.fabwaseem.com/mcp. No key. The tool name is format_json.
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How it works
Free JSON formatter and JSON validator that runs in the browser. Choose an indent of 2, 4, or a tab, sort object keys, minify, and read a tree of the value. Invalid JSON reports the line, the column, and the line of source.
- 01
Paste JSON
Drop a payload, a config file, or a response body into the editor. Nothing is uploaded.
- 02
Pick pretty or minify
Pretty uses 2 spaces, 4 spaces, or a tab. Minify removes the insignificant whitespace. Sort keys when you want a stable order.
- 03
Read the error or the tree
An invalid document names the line and column. A valid one can be copied, downloaded, or opened as a tree.