Question 1

What is ihateJSON?

Accepted Answer

ihateJSON is a free, open-source, browser-based JSON formatter and beautifier powered by a WebAssembly (WASM) engine compiled from Rust. It formats, validates, diffs, searches, and converts large JSON files (20,000+ lines) in sub-milliseconds directly in your browser — no server, no uploads, 100% private.

Question 2

How do I format large JSON files online for free?

Accepted Answer

Use ihateJSON at ihatejson.xyz — paste or drop your JSON file directly into the browser. The WASM Rust engine formats even 20,000+ line JSON files instantly with zero lag. It is completely free and requires no login or server upload.

Question 3

Is ihateJSON safe? Does it upload my JSON data?

Accepted Answer

Yes, ihateJSON is completely safe. It processes all JSON 100% client-side in your browser using WebAssembly. Your data never leaves your device and is never sent to any server.

Question 4

What is the best free online JSON formatter?

Accepted Answer

ihateJSON (ihatejson.xyz) is one of the fastest free online JSON formatters available. It uses a Rust-compiled WebAssembly engine to format JSON files of 20,000+ lines in under 2ms, supports collapsible tree view, regex search, JSON diff, JSON to XML conversion, and 6 editor themes.

Question 5

Can ihateJSON handle large JSON files with 20000+ lines?

Accepted Answer

Yes. ihateJSON is specifically engineered for large JSON payloads. Its WASM Rust engine processes 20,000+ line JSON files in under 2 milliseconds with zero main-thread UI lockup, making it the ideal tool for working with large API responses, log files, and data exports.

Question 6

What is the difference between JSON formatter and JSON beautifier?

Accepted Answer

A JSON formatter and JSON beautifier are essentially the same thing — they both take compact or malformed JSON and add proper indentation, line breaks, and structure to make it human-readable. ihateJSON does both, with support for 2-space, 4-space, tab, and minified output modes.

Question 7

How do I compare two JSON files online?

Accepted Answer

ihateJSON includes a built-in JSON Diff & Compare tool. Click the ⚖️ Diff button, paste your two JSON payloads into the left and right panels, and click 'Run Diff' to see a side-by-side view with additions, deletions, and modifications highlighted.

Question 8

Can I convert JSON to XML online for free?

Accepted Answer

Yes. ihateJSON has a built-in JSON to XML converter. Click the 📄 XML button after formatting your JSON and it will instantly produce a structured, compliant XML document using the WASM Rust engine.

Question 9

Does ihateJSON work as a Chrome Extension?

Accepted Answer

Yes. ihateJSON is available as a free Chrome browser extension. It adds a popup for quick JSON formatting directly in your browser toolbar, letting you paste and fix JSON without leaving your tab.

Question 10

What technology powers ihateJSON?

Accepted Answer

ihateJSON is powered by a Rust-compiled WebAssembly (WASM) engine. The core JSON parsing, formatting, diff, and XML conversion logic is written in Rust and compiled to wasm32-unknown-unknown with zero runtime dependencies for maximum browser performance.

I hate JSON — Paste or Drop File