JSONNorm
Free JSON to CSV converter for nested data, arrays, NDJSON, large files, and tricky edge cases. Preview the table before converting. No signup required.
Free JSON to CSV converter for nested data, arrays, NDJSON, large files, and tricky edge cases. Preview the table before converting. No signup required.
This page is designed to help you find out whether JSONNorm is good and if it is the right choice for you.
jsonnorm is a free, no-signup JSON to CSV converter built for messy real-world data. It handles nested objects, arrays with explicit keep/join/explode rules, NDJSON/JSONL with changing fields, null vs missing values, large numbers without float rounding, and spreadsheet-formula-like cells. You can preview the output schema before converting, use the web app for files up to 100 MiB, or call the anonymous HTTP API without an API key or account. Large inputs are processed with bounded-memory streaming, and no conversion history is kept.
Listed in
Large files
Bounded-memory streaming for large JSON and NDJSON inputs
Nested JSON
Flatten nested objects into predictable CSV columns
Array handling
Choose per-path keep, join, or explode behavior
NDJSON / JSONL
Build a union schema across changing records
Anonymous API
Convert JSON to CSV over HTTP with no API key or account
jsonnorm focuses on predictable conversion rather than just flattening JSON. It lets you control array behavior per path, distinguishes tricky cases like null vs missing values, preserves large numbers without float rounding, handles changing NDJSON schemas, and previews the output structure before conversion.
Choose jsonnorm when the structure of the output matters. It is designed for nested or inconsistent JSON where simple converters can silently change row counts, drop fields, or alter values. It is free, requires no signup, supports large files, and also provides an anonymous HTTP API.
Developers, data engineers, analysts, and technical users who need to turn nested JSON, API responses, or NDJSON/JSONL into predictable CSV without writing a one-off conversion script.
jsonnorm started from a simple problem: JSON-to-CSV tools work well on easy inputs, but real data often contains nested objects, arrays, changing schemas, nulls, and large numeric IDs. The project was built around making those conversion decisions explicit and predictable instead of hiding them behind defaults.
.NET / ASP.NET Core, C#, and a browser-based web frontend.
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Check the traffic stats of JSONNorm on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
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