Joker

Working with JSON and XML on a phone usually means squinting at a wall of unformatted text and guessing where a stray comma or unclosed tag broke everything. FormatCheck JSON & XML Studio turns your device into a proper formatting and validation workstation, catching errors the moment you type and telling you exactly where they are. It is built for developers, QA engineers, and anyone who needs to read, clean up, or verify structured data on the go.

What sets FormatCheck apart is its precision and its developer-first feel. Instead of a vague "invalid input" message, it points you to the exact line, character position, and reason a document failed validation, all wrapped in a clean monospace layout with a crimson accent that keeps your eyes on the code. Smart mode detection means you rarely have to tell it what you are working with — it figures out JSON versus XML on its own.

KEY FEATURES
• Pretty-print formatting - Instantly reformat messy JSON or XML into clean, properly indented structure so nested data is easy to read and review.
• Minify - Strip whitespace and collapse documents down to their most compact form, ideal for copying compact payloads or saving space.
• Live validation - Your document is checked continuously as you type, so problems surface immediately instead of after you paste somewhere else.
• Precise error reporting - When something is wrong, you get the exact line, character position, and a plain-language reason, cutting debugging time dramatically.
• Color syntax highlighting - Keys, values, tags, and structure are color-coded to make large documents scannable at a glance.
• Smart mode detection - The app automatically recognizes whether your input is JSON or XML and switches to the right mode without extra taps.
• Auto-format on paste - Turn on this optional setting to have pasted content formatted the moment it lands in the editor.
• Snippet history - Previous documents are saved so you can restore earlier work and pick up where you left off.
• Adjustable indentation - Set the indentation depth that matches your team's style or personal preference.
• Copy to clipboard - Move your formatted or minified result out to any other app with a single tap.
• Guided onboarding and quiz - A short introduction and quick quiz help you learn the core features fast.

HOW IT WORKS
• Paste or type your JSON or XML into the editor and let smart detection pick the correct mode.
• Watch live validation flag any issues in real time, with the exact line and character called out.
• Tap to pretty-print for readability or minify for a compact result, adjusting indentation to taste.
• Copy the clean output to your clipboard, and rely on snippet history to bring back earlier documents whenever you need them.

PERFECT FOR
• Developers debugging API responses or config files away from their desk.
• QA engineers verifying payloads and checking structured test data.
• Anyone who receives raw JSON or XML and needs it readable fast.

PRIVACY
There is no account to create, no cloud sync, no ads, and no tracking. Everything you paste, format, and validate stays entirely on your device.

Stop fighting with unreadable data and cryptic error messages. Install FormatCheck JSON & XML Studio and format, validate, and fix your JSON and XML with confidence, right from your phone.

Recent changes:
New version!