Each guide takes one thing JSON does that surprises people, shows the real output from the engine, and explains what to do about it. No framework installs, no twenty-minute read — the numbers come from measurements taken in this project, not from a vendor page.
Errors
Seven real parser messages with the input that produces them, what the parser is complaining about, and the fix for each — including why some errors arrive with no line number at all.
8 min readJSON Validator
Numbers
Formatting JSON is supposed to be lossless. For large integers, numeric-looking keys and duplicate members it is not. Here is exactly what changes and how to stop it.
9 min readJSON Formatter
Payload size
Measured on a real 216 KB document: minification cuts 43.7% of the raw bytes, but only 10.8% after gzip and 4.9% after brotli. When the effort pays off — and when it does not.
7 min readJSON Minifier
Looking for the tools instead? Start with the JSON Formatter, the JSON Validator or the JSON Minifier.