JSONL Validator
Your data never leaves your browserValidate JSON Lines (JSONL) files and find broken rows by line number.
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About JSONL Validator
Paste your JSONL (JSON Lines) content and instantly validate each line as independent JSON. The tool reports exactly which lines are valid and which contain errors, making it easy to debug large JSONL datasets used in machine learning, logging, and data pipelines.
How to use
- Paste your JSONL content (one JSON object per line) into the input.
- The validator checks each line independently in real time.
- See which lines are valid and which have errors with line numbers.
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Frequently Asked Questions
FAQs about JSONL Validator
What is JSONL?
JSONL (JSON Lines) is a format where each line is a valid JSON value, typically a JSON object. It is used for streaming data, log files, and machine learning datasets.
How is JSONL different from JSON?
A JSON file contains one JSON value (usually an array or object). A JSONL file contains one JSON value per line, with no commas or brackets between lines.
What does this tool check?
Each line is parsed independently as JSON. Lines that fail to parse are reported with their line number and the specific error message.
Are blank lines allowed?
Yes. Blank lines are skipped during validation and do not count as errors.
Is my data safe?
Yes. All validation happens in your browser. No data is sent to any server.