JSON is everywhere, in API responses, config files, and log lines, and almost all of it needs the same handful of fixes: make it readable, shrink it, convert it, or work out why a parser is choking on it. These guides walk through each job with real examples, and every one links to a tool that does the work right in your browser, so your data never leaves the page.
Why Is My JSON Invalid? How to Find and Fix the Error
The six mistakes that break JSON, how to read a parser error, and how to fix invalid JSON fast.
Pretty-Print vs Minify: When to Format JSON and When to Compress It
When to format JSON for readable diffs and debugging, when to minify it for size, and how to do both privately in your browser.
How to Convert JSON to CSV (and Keep Nested Data Sane)
Convert JSON to CSV without losing your nested objects: flattening, exploding arrays, delimiters, Excel BOM gotchas, and the round-trip back.
Turn a JSON Response into a TypeScript Interface in Seconds
Generate a TypeScript interface from any JSON response: optional fields, nullables, nested types, and where a single sample falls short.
YAML vs JSON: Which One Should Your Config Use?
YAML vs JSON compared for config files and APIs: syntax, comments, the Norway problem, indentation traps, TOML, and lossless conversion.
How to Minify JSON to Shrink API Payloads
What minifying JSON actually removes, the realistic 20 to 40 percent size win, and why server compression usually matters more.
Tools in this guide
Format, beautify and validate JSON online with clear error messages for invalid input.
Minify and validate JSON in your browser, and see how many bytes you save.
Convert JSON to CSV and CSV back to JSON, both ways. Choose the delimiter, handle quoted fields, and copy the result. Everything runs in your browser.
Convert YAML to JSON and JSON back to YAML, both ways. Validates as it converts and shows clear errors. Everything runs in your browser.
Generate TypeScript interfaces from a JSON sample, with nested types, arrays and optional fields. Runs in your browser.
Convert JSON to XML and XML back to JSON, in both directions, entirely in your browser.
Convert JSON to TOML and TOML back to JSON, in both directions, entirely in your browser.
Convert CSV to a Markdown table and Markdown tables back to CSV, both directions.