NDJSON File Generator
Newline-delimited JSON, one complete object per line. Generate dummy NDJSON files from 1KB to 20MB, exact to the byte. No uploads, no registration. 100% free and private.
Generate NDJSON File
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Files are generated on the server
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Features
- Every line parses independently as valid JSON, as the format requires
- Exact byte sizes from 1KB to 20MB
- Fast server-side generation
- No registration required
- Deterministic output — the same request returns the same file
Use Cases
- Test NDJSON upload functionality in web apps
- Verify file size validation limits
- Test NDJSON parsing and processing pipelines
- QA storage and CDN behaviour
- Load testing with various file sizes
Frequently Asked Questions
- How do I generate a dummy NDJSON file?
- Pick a preset size or switch to the Exact size tab to type a precise byte count, then click "Generate NDJSON File". The file is created on our server and downloaded automatically.
- Are the generated NDJSON files valid?
- Every line parses independently as valid JSON, as the format requires.
- Is my data safe?
- Yes. Files are generated on our servers and downloaded directly to your device. We do not store any generated files.