JSON Formatter, Viewer & Editor Features

Everything you need to work with JSON, right in your browser. No sign-up, no installation, no data sent to any server.

JSON Formatter & Beautifier

Pretty-print JSON with proper indentation and color-coded syntax highlighting. Supports both strict and tolerant parsing for malformed JSON, so you can format even broken payloads. Handles large files with a loading indicator so the UI stays responsive.

JSON Minifier

Compact JSON to a single line by removing all whitespace. Use the keyboard shortcut Cmd/Ctrl+Shift+M for instant minification. Perfect for reducing payload size before sending JSON over the network or storing it efficiently.

JSON Validator

Validate JSON automatically when formatting. Invalid JSON is flagged with clear error messages. Best-effort formatting shows you where problems are, even in broken input. Uses JSON.parse for strict validation and a tolerant parser as a fallback.

JSON Viewer with Collapsible Tree

View JSON in a structured format with fold/unfold controls for every object and array. Collapse all or expand all with one click. Bracket pair highlighting helps navigate deeply nested structures. Line numbers keep you oriented in large documents.

Search & Find in JSON

Real-time search with highlighted matches across your entire JSON document. Navigate between matches with Next/Previous buttons or keyboard shortcuts. Instantly find keys, values, or patterns. Match count shows you exactly how many results were found.

Load JSON from URL or File

Import JSON from any public URL or upload a local .json file. Drag and drop support included. JSON Hero also auto-detects JSON in your clipboard and offers to paste it for you. Fetch API responses directly by entering the endpoint URL.

Clipboard Auto-Detection

JSON Hero detects JSON content in your clipboard when you open the page. Escaped JSON strings are automatically unescaped and formatted. Paste from any source — API responses, log files, or code editors — and get clean, readable JSON instantly.

Download Formatted JSON

Export your formatted or minified JSON as a downloadable text file with one click. Save clean, well-formatted output directly to your device for use in other tools, documentation, or version control.

How to Format JSON Online

  1. Open JSON Hero — Visit jsonhero.dev in any modern browser. No download or installation needed.
  2. Paste your JSON — Paste JSON into the editor, or click "Load JSON" to import from a URL or file.
  3. Click Format — Your JSON is instantly pretty-printed with syntax highlighting, line numbers, and fold controls.
  4. Search, edit, or download — Use the search bar to find values, collapse sections to focus on what matters, or download the formatted result.

Ready to format your JSON?

No sign-up, no installation. Just paste and format.

Open JSON Hero Editor