The config file that will not parse
You copied a response from the network tab, edited it by hand, and now your app throws Unexpected token on line 1. JSON is unforgiving: one trailing comma or a single-quoted key and the whole payload is invalid. Guessing where the error is wastes an afternoon.
Format and catch errors in one pass
Paste the text into the JSON Formatter & Validator. It pretty-prints the structure, collapses nested objects so you can scan them, and flags the exact spot where parsing fails. Minify it again when you are done, or keep it readable for a commit.
Make the data useful, not just valid
Once the JSON is clean, you often need it somewhere else. The JSON to CSV Converter flattens an array of objects into rows you can drop into a spreadsheet, a database import, or a quick report. Validate first, convert second — that order saves you from exporting garbage.
A simple pre-ship checklist
- Paste the payload and confirm it parses with zero errors.
- Pretty-print to eyeball the shape before committing a config or fixture.
- Minify for production, or convert to CSV when a teammate needs a table.
Running this check takes ten seconds and prevents the "works on my machine, breaks in CI" JSON bug that shows up at the worst time.