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JSON Formatter, Validator & TypeScript Generator

Beautify, minify, and explore JSON with a live tree view, precise syntax-error locations, and one-click TypeScript interface generation — all processed locally in your browser.

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Add the JSON Formatter & Validator directly to your website by copying the iframe snippet.

What is the JSON Formatter & Validator?

The JSON Formatter & Validator is a developer utility for beautifying, minifying, and inspecting JSON payloads — API responses, config files, log dumps, or hand-written test fixtures — without leaving your browser tab. It parses your input with the native JSON object, so validation matches exactly what your runtime will accept.

Beyond formatting, it includes an interactive collapsible tree view with click-to-copy JSON paths, a TypeScript interface generator that infers and merges shapes across arrays of objects, a live statistics panel, and a recursive key-sorter — all built with vanilla JavaScript and no external dependencies.

How to Use It?

  1. Step One: Paste JSON into the input box, drag a .json file onto it, or click "Upload .json file".
  2. Step Two: Click "Format / Beautify" to pretty-print with your chosen indent, "Minify" to collapse it, or "Sort Keys" to alphabetize object keys recursively.
  3. Step Three: Switch to the "Tree View" tab to explore and search the structure, or "TypeScript" to generate matching interface definitions. Copy or download any output with one click.
Privacy Note: All parsing, formatting, tree rendering, and TypeScript generation happen 100% locally in your browser. No JSON you paste or upload is ever sent to a server.

Frequently Asked Questions

Is my JSON data uploaded anywhere?
No. Every parse, format, tree render, and TypeScript generation happens locally in your browser tab using native JavaScript. Nothing you paste or upload ever leaves your device.
Is there a maximum file size I can paste or upload?
There is no hard limit enforced by the tool, but very large files (tens of megabytes) may slow down your browser tab since parsing and tree rendering happen on the main thread.
Does it support JSON5 or JSON with comments?
No. This tool enforces strict JSON per the official specification, matching what JSON.parse accepts. Comments, trailing commas, and unquoted keys will be reported as syntax errors.
What is the TypeScript generator for?
It infers TypeScript interfaces from your JSON structure, merging shapes across arrays of objects and unioning field types that vary between items, so you can drop typed definitions straight into a codebase.
Is this JSON formatter free to use?
Yes. It is completely free, with no account, watermark, or usage limit.

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