Data & APIs
JSON formatter
Free JSON formatter and validator: prettify with consistent indentation, catch syntax errors, and minify payloads—runs locally in your browser.
Overview
Paste raw JSON responses, config fragments, or generated blobs to prettify them with consistent indentation. When you need a compact payload for requests or storage, minify with one click while still catching parse errors early. Ideal for debugging APIs, reviewing schema samples, or cleaning snippets before committing them.
Frequently asked questions
Is this JSON formatter private? Is my JSON stored on a server?
No storage step is involved. Parsing and formatting happen locally, so sensitive payloads are not transmitted by this utility.
Why does JSON format, prettify, or validate fail with an error?
The input must be valid JSON: double-quoted keys, commas between items, and matching brackets. The error message references the first parse failure the browser reports.
Can I minify JSON that contains Unicode characters?
Yes. `JSON.stringify` preserves Unicode characters; they will remain escaped or unescaped according to standard JSON encoding rules.
Related tools
Tools that complement this one—same upfront privacy notes apply.