Valid JSON
The brackets are behaving. Pick an action above.
Coming later: JSON to TypeScript and JSON to YAML. One bracket adventure at a time.
JSON Toolkit
Paste a payload, tidy it up, check what broke, or squeeze it onto one line. Your JSON never leaves this page.
Build notesUnder the hood, without the lecture
JSON Toolkit treats the browser's own parser as the authority, then adds useful presentation around it.
Parse once, use everywhere
Live validation produces either a parsed value or a structured error. Format, minify, and sort reuse that result instead of parsing independently and disagreeing.
Arrays keep their meaning
Sorting walks the entire value recursively, but only alphabetizes object keys. Arrays retain their original order because changing it could change the data itself.
Errors should point somewhere
Parser positions are translated into line and column numbers, then paired with the offending line. It is much nicer than a red box that only says invalid.
if (Array.isArray(value)) return value.map(sortKeys);
if (value && typeof value === "object") {
return Object.fromEntries(
Object.entries(value)
.sort(([a], [b]) => a.localeCompare(b))
.map(([key, child]) => [key, sortKeys(child)])
);
}const before = input.slice(0, position);
const line = before.split("\n").length;
const column = position - before.lastIndexOf("\n");