Why a local-only JSON formatter matters
JSON payloads routinely contain bearer tokens, internal hostnames, customer PII, and unreleased data. Most online formatters post your input to their server to process it. This one runs JSON.parse and JSON.stringify in your own browser tab — open DevTools and watch the network panel stay empty. It also means there's no payload size cap: if your machine can hold it, this tool can format it.
Error messages that actually locate the error
Instead of "Unexpected token," validation failures report the line and column where parsing stopped, with the surrounding text quoted, so you can fix a missing comma in a 5,000-line file without hunting for it.