How to use JSONL Validator
- Paste JSON Lines text or choose a .jsonl, .ndjson, or .txt file. Put one complete JSON value on each nonempty line.
- Select Validate JSONL lines. Blank lines are counted and ignored; each other line is parsed independently.
- Use the reported line numbers to fix errors and validate again. When at least one line is valid and none are invalid, download the validated JSONL file.
What this tool does
A valid JSON line is not necessarily valid against an application schema.
Example
These two lines are valid JSONL: {"id":1} followed by {"id":2}. If the second line is {"id":}, the report identifies line 2 as invalid.
Frequently asked questions
Does a valid line mean the record matches my schema?
No. This tool checks JSON syntax only; it does not compare keys or values with an application schema.
Are blank lines errors?
No. Blank lines are ignored during parsing and included in the blank-line count.
Privacy
Your input is processed in your browser. This version does not send document content to a conversion server and includes no advertising or analytics scripts. Loading the website requires a network connection.
Operator: Francescco Pernice Botta. Contact: klabindustries.hq@gmail.com.
Terms
Use this tool only with content you are allowed to process. Check the result before relying on it.
Contact
Operator: Francescco Pernice Botta. Contact: klabindustries.hq@gmail.com.