JSONLines
Open validator

JSON Lines · NDJSON

Private JSON Lines validator and formatter

Validate any JSON value per line, locate errors and create bounded formatted or array output.

Local records

One JSON value on each non-blank line

● Stays in this browser
0 / 2,000,000

A final line terminator is allowed. Blank records are invalid; CRLF is accepted and lone CR is normalized with a notice.

Any JSON value is valid, including scalars and arrays. A UTF-8 BOM at the first character is rejected.