About Us

JSON Formatter is a free online JSON formatter, validator and viewer that runs entirely inside your browser. No account, no upload, no usage limits — paste JSON and read it.

Why we built it

Anyone who works with APIs ends up staring at a 40,000-character line of JSON several times a week. The tools that fix that problem are everywhere, but most of them share the same flaws: they post your data to a server, wrap the useful part in advertising, gate features behind a sign-up, or fall over the moment you paste something genuinely large.

We wanted the opposite — a page that loads instantly, parses locally, handles multi-megabyte payloads without freezing, and asks nothing of you. That is the whole product. It does one job and tries to do it better than the alternatives.

What the tool does

• Format and beautify JSON with 2-space or 4-space indentation and syntax highlighting.
• Validate as you type, reporting the exact line and column where a parse fails.
• Minify back down to a single line for request bodies, fixtures and environment variables.
• Explore a collapsible tree view built to stay responsive on deeply nested data.
• Search keys and values, and copy the dot-notation path to any node.
• Convert to CSV, YAML or XML, and generate TypeScript interfaces from a sample payload.
• Load files by drag and drop, and download the formatted result.

How it handles your data

Every operation happens in your browser using the JavaScript engine already running on your machine. Your JSON is never uploaded, never logged and never stored on a server, because there is no server doing the work. That is what makes it safe to paste a production API response containing tokens, customer records or internal endpoints. The full detail is in ourPrivacy Policy.

How it is built

The site is a static page — no backend, no database, no tracking scripts. Parsing, rendering and conversion are plain client-side code. After the first load the page is self-contained, so formatting keeps working even with the network disconnected.

Who uses it

Backend and frontend developers reading API responses. QA engineers comparing expected against actual payloads. Data analysts flattening nested JSON before it reaches a spreadsheet. DevOps engineers checking a config a deploy just rejected. Technical writers pulling accurate examples out of live responses. Students learning what nesting actually looks like.

Get in touch

Bug reports, feature requests and corrections are all welcome — see theContact page. Use of the site is covered by ourTerms & Conditions.

Open the JSON formatter and paste something in.