NDJSON Validator Online

The NDJSON Validator Online focuses on per-line JSON validation for newline-delimited data. It treats every line as an independent JSON value and reports syntax errors with exact line numbers. This makes it ideal for developers, data engineers, and QA specialists who work with logs, streaming APIs, or batch exports formatted as NDJSON.
Core logic processes input line by line, parsing each line into JSON and tallying valid versus invalid records. When a JSON Schema is provided, the tool applies per-record validation against the schema and returns a structured report of mismatches. Optional features include ignoring blank lines, exporting a machine-readable error report, and streaming processing to accommodate large files. The tool emphasizes deterministic, line-level feedback to minimize remediation time and to enable automated pipelines to fail fast on malformed data.
Use cases include pre-ingestion validation before loading data into data lakes, warehouses, or analytics platforms, as well as validating transformed NDJSON streams during ETL and data quality checks. Unique value lies in its combination of per-line reporting, optional JSON Schema validation, and easy export of a machine-readable report suitable for CI/CD and data ops workflows.