About · JsonLab

What is JsonLab?

JsonLab is a free suite of browser-based tools for working with JSON. Whether you need to beautify a minified API response, validate a config file, compare two payloads or convert JSON into a spreadsheet, you can do it instantly — no installs, no sign-up, and no waiting on a server round-trip.

Privacy by design

Every tool runs entirely in your browser. The JSON you work with is never transmitted to or stored on our servers. That makes JsonLab safe to use even with sensitive data, and fast enough to handle large documents without lag.

What you can do

JSON Formatter & Beautifier — Beautify and format messy JSON instantly with a VSCode-grade editor. Validate as you type, view as a tree, minify, copy and download — all in your browser.
JSON Validator — Validate JSON online and get precise, line-and-column error messages for every syntax problem.
JSON to CSV Converter — Convert JSON arrays to clean CSV you can open in Excel or Google Sheets.
JSON Diff Tool — Compare two JSON documents and highlight everything that was added, removed or changed.

Why it's free

JsonLab is supported by unobtrusive advertising. Ads never appear inside the editor or interrupt your workflow, and analytics and ads only load after you opt in. This keeps the tools free for everyone while respecting your focus and your privacy.

Built with

JsonLab is built on Next.js and TypeScript, uses a VSCode-grade editor, and is optimized for speed and search engines alike. It works in any modern browser, on desktop and mobile.

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