Developer Builds Client-Side JSON-to-CSV Tool That Flattens Nested Objects

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A developer frustrated with broken outputs from existing JSON-to-CSV converters has built JSONCSV.tools, a browser-based utility that accurately flattens deeply nested JSON structures into spreadsheet-ready CSV files. The tool uses a recursive flattenObject() function with dot-notation key concatenation to handle nested objects and arrays, producing clean column headers such as address.city or tags.0 instead of garbled placeholders. It runs entirely client-side with no backend, meaning user data never leaves the browser, and offloads heavy processing to a Web Worker to keep the interface responsive. The developer also extracted the core flatten and unflatten logic into a standalone npm package called json-csv-flatten for use in Node.js or React projects. The free tier of the web tool currently supports files up to 1MB or 500 rows.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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