Excel to JSON Online — Convert .xlsx to Clean JSON for APIs
By ParquetReader Team
When Excel to JSON is the right choice
Many teams receive source data in .xlsx but need JSON for APIs, automation tools, or web apps.
Converting directly keeps the workflow simple and avoids manual copy and paste errors.
Clean column types before export
Excel files often mix numbers, text, and empty cells in the same column.
Run SQL checks first so your JSON output has predictable types and fewer downstream parsing issues.
SQL checks worth running
Start with null and uniqueness checks: SELECT COUNT(*) FROM dataset WHERE id IS NULL; and SELECT COUNT(DISTINCT id) FROM dataset;.
Then create a stable export shape: SELECT id, created_at, status, amount FROM dataset;.
Export strategy
Export only the fields your API or integration needs. Smaller JSON payloads are easier to validate and ship.
If you also need analytics processing, keep a Parquet export next to the JSON export.
Related guides
Excel to CSV for spreadsheet handoff.
Excel to Parquet for analytics pipelines.
Need to open data files quickly? Use the Parquet Viewer Online tool to upload, inspect, and export in one workflow.