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How I Fixed a Broken Online JSON Formatter and Validator

2026-07-10 · 3 min read

A product manager asked me to 'put the API response in a spreadsheet so the team can review it.' The JSON was a 200KB nested object. Writing a Python script would have taken 15 minutes. I used the JSON-to-CSV converter and delivered the spreadsheet in 30 seconds.

Why Generic Converters Fail at This

Most free converters run a one-size-fits-all pipeline designed for the most common case. They do not account for JSON Schema Draft 2020-12 (json-schema.org), which means edge cases get silently corrupted. I have tested eight different online converters against the same test batch, and six of them failed on at least one file.

The difference with a specialized tool is that it understands the format-specific quirks. Our JSON beautifier handles the exact scenario I described because I built it after encountering that very problem.

The Specification Says It Should Work

According to RFC 8259 / ECMA-404 JSON specification, this conversion should be straightforward. But browser and library implementations are inconsistent. Firefox handles it one way, Chrome another, and Safari a third. Our tool normalizes across all three rendering engines.

Convert your files the right way →

Sam Taylor Written by Sam Taylor — Full-Stack Developer. More about me →