Quick answer
Upload your CSV file to SheetZAPI. The first row becomes your field names, every subsequent row becomes a JSON object, and your data is immediately available via a REST API with filtering, sorting, pagination, and Redis caching. It takes under 60 seconds and requires no code.
CSV is the most portable data format — exported from every database, spreadsheet, and SaaS tool. SheetZAPI treats an uploaded CSV exactly like a live Google Sheet: header row maps to field names, values are type-cast automatically, and the full REST interface (GET, POST, PATCH, DELETE, aggregations, filtering) is available immediately.
The file must be UTF-8 encoded with a comma delimiter. The first row must contain column headers with no blank cells. SheetZAPI handles quoted fields, embedded commas, and multi-line values. Numeric strings are cast to numbers. Columns named 'true', 'false', 'yes', 'no' (case-insensitive) are cast to booleans. Maximum file size is 50MB.
All SheetZAPI query parameters work on CSV data: ?_filter=country:eq:US, ?_sort=revenue, ?_search=acme, ?_fields=name,email,plan, ?_limit=100&_offset=0. Aggregation endpoints (/agg/sum?column=revenue, /agg/count) work on the full dataset without downloading it. Results are cached in Redis after the first request.
Re-upload a new CSV at any time to replace the dataset. Your API URL and key remain unchanged. Alternatively, use the POST /rows endpoint to add new rows programmatically, or PATCH /rows/:id to update individual rows. This lets you treat the uploaded CSV as a persistent, editable dataset rather than a static snapshot.
How do I make a REST API from a CSV file?
Upload your CSV to SheetZAPI. Your data is instantly available as a REST API with filtering, sorting, and caching. No database or backend code required.
Can I query a CSV file via URL without building a backend?
Yes. SheetZAPI exposes your CSV as a REST endpoint with URL-based filtering and sorting. No backend, no parsing code, no infrastructure to manage.
How do I update CSV data via API?
POST to /rows to add rows, PATCH /rows/:id to update, DELETE /rows/:id to remove, or re-upload a new CSV to replace everything. Your API URL stays the same.
Is there a size limit for CSV uploads?
SheetZAPI accepts CSV files up to 50MB. For larger datasets, Google Sheets (up to 10 million cells) is a better source to connect rather than upload.
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