JSONL Validator
Validate your JSON Lines data instantly - 100% client-side, secure, and fast. Check syntax, detect errors, and ensure data integrity.
Validation Options
Total Lines
0
Valid Lines
0
Error Lines
0
Success Rate
0%
Error Details
Warnings
Validator Features
100% Client-Side
Your data never leaves your browser. All validation happens locally for maximum security and privacy.
Lightning Fast
Validate thousands of lines instantly with optimized JavaScript parsing and error detection.
Detailed Error Reports
Get precise line numbers, error types, and helpful messages to fix issues quickly.
Schema Consistency
Optionally check that all records have consistent field names for data integrity.
Duplicate Detection
Find duplicate ID values across your dataset to ensure data uniqueness.
Export Results
Download valid lines or error reports for further processing or debugging.
How It Works
Input Your Data
Paste JSONL text, upload a file, or load an example dataset to begin validation.
Line-by-Line Parsing
Each line is parsed independently as JSON, catching syntax errors with precise line numbers.
Advanced Checks
Optional schema consistency and duplicate ID detection run on valid records.
Get Detailed Results
Review statistics, error details, and download clean data or error reports.
Your Data Stays Private
This validator runs 100% in your browser using JavaScript. Your JSONL data is never uploaded to any server, ensuring complete privacy and security. Perfect for sensitive or proprietary data.