JSON formatter
Format, minify and validate JSON. Inspect nested data in the tree view.
Drag a .json, .jsonl, or .ndjson file here, or choose one locally. The file is read into the input box only; it is not uploaded or stored.
Tree view / JSON Lines
JSON complete structure report
Root type-
Nodes0
Objects0
Arrays0
Max depth0
Strings0
Numbers0
Booleans0
Nulls0
Tree view
Usage and limits
The tree view renders up to 3000 nodes and stops before very large objects can block the page. This tool checks syntax and structure, not JSON Schema semantics.
Input limit is 1 MiB of UTF-8 text. The lightweight scanner only reports common duplicate key and large integer diagnostics; it is not a full AST-preserving parser.