SQL Sandbox

The SQL Sandbox is a client-side database engine that evaluates SQL queries directly against CSV files or JSON arrays in the browser. The parser handles selections, joins, counts, regex filtering, and listings locally. The query sandbox operates in-browser to protect your database parameters. Furthermore, the converter maintains exact data types for numbers, booleans, and null fields, ensuring type safety when importing files into database servers or runtime systems. The formatting layouts adhere strictly to official language specifications. With zero server round-trips required, developers can execute large translation tasks instantly without worrying about timeout thresholds, network latency, or upload speed bottlenecks. By utilizing local browser sandbox isolation and client-side processing, Secure Devutils protects your intellectual property and private credentials from external logging pipelines and third-party data tracking networks. For more details, explore our blog articles: Why Offline-First Developer Tools Matter and The Hidden Risks of Online Developer Tools.

You can drag and drop or click "Open File" to upload .csv or .json files. The table name will match the sanitized filename. Multiple tables can be loaded simultaneously, letting you query across them.

Our SQL engine supports SELECT statements with column aliasing (col AS alias), wildcard columns (*), FROM table references, filter clauses (WHERE <expr>), ordering rules (ORDER BY col), and limit constraints.

You can build expressions with comparisons (=, !=, <, >), null tests (IS NULL), string regex matches (LIKE where % matches any characters), list memberships (IN (v1, v2)), and range boundaries (BETWEEN).

Yes. Secure Devutils processes all file reading, tokenizing, parsing, and query evaluation exclusively in-memory on your device. Your data never leaves your browser, keeping it safe for corporate and PII-restricted compliance needs.