How to Test Data Export in Vibecoded Apps
Data export is a feature users rely on heavily but test rarely. AI-generated export functions often produce files with missing columns, wrong encoding, broken formatting, or performance issues when exporting large datasets.
Last updated: 2026-03-14
Testing Export Format and Accuracy
Export data in each supported format (CSV, Excel, PDF, JSON) and open the files in the appropriate application. Verify that all columns are present, data is in the correct columns, and no records are missing. AI-generated export code frequently drops columns that were added to the database after the export feature was built.
Compare exported data against what is displayed in the app. Pay attention to formatted values: dates should be in a consistent format, numbers should preserve decimal places, and currency values should include the proper symbol. AI-generated CSV exports commonly have issues with fields containing commas, quotes, or newlines — these need to be properly escaped or quoted.
Testing Special Characters and Encoding
Create test records with Unicode characters (accented letters, CJK characters, emoji) and export them. Open the export and verify characters are preserved. AI-generated export functions often use ASCII encoding instead of UTF-8, corrupting any non-English characters. CSV files should include a UTF-8 BOM (byte order mark) for Excel compatibility.
Test with HTML and script content in fields to verify they are exported as plain text, not rendered. Also test with extremely long values in fields — some export functions truncate data silently. Verify that null and empty values are handled consistently and distinguishably in the export output.
Testing Large Dataset Exports
Export a large dataset (10,000+ rows) and verify the export completes without timeout or memory errors. AI-generated export functions often load the entire dataset into memory before writing the file, which works for 100 rows but crashes with 100,000 rows. The export should use streaming or chunked processing for large datasets.
Test the user experience during long exports: is there a progress indicator? Can the user continue using the app while the export runs in the background? Does the download start automatically or does the user receive a notification when it is ready? AI-generated export buttons often block the UI thread during export, freezing the entire app.
Frequently Asked Questions
How do I test CSV exports for correctness?
Open the CSV in a text editor (not Excel) to inspect the raw format. Check that delimiters are consistent, strings with commas are quoted, and the encoding is UTF-8. Then open in Excel or Google Sheets to verify it parses correctly into the expected columns.
What is the most common data export bug in vibecoded apps?
The most common issue is CSV fields containing commas or newlines that break the file structure. These values need to be wrapped in quotes. The second most common is missing columns because the export query was not updated when new fields were added to the database.
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