JSON Formatter & Viewer
Format, minify and validate JSON with syntax highlighting and interactive tree view. Everything runs in your browser — your data never leaves your device.
Paste your JSON from APIs, config files, databases or any source. Supports nested objects, arrays, and all JSON data types. Use Format for readable output with indentation, Minify to compress, or switch to Tree View to explore the structure interactively.
How It Works
This JSON formatter processes your data entirely in your browser — no data is sent to any server. Paste your JSON, click "Format" or "Minify", and see the result with syntax highlighting or as an interactive tree.
Format & Minify
Format adds proper indentation (2 spaces, 4 spaces, or tabs) and line breaks to make JSON human-readable. Minify removes all unnecessary whitespace, reducing the JSON to a single compact line — ideal for APIs and configuration files.
Syntax Highlighting
The formatted output uses a dark theme with color-coded elements: keys in blue, strings in orange, numbers in green, booleans in blue, and null in gray. Line numbers are shown on the left for easy reference.
Tree View
Switch to Tree View to explore your JSON as a collapsible tree. Click the arrows to expand or collapse objects and arrays. Each node shows its key, type, and value — perfect for navigating deeply nested structures.
Privacy First
All processing runs locally in your browser using JavaScript. Your data never leaves your device — there are no server requests, no cookies, and no tracking.
Frequently Asked Questions (FAQ)
Q: What does this JSON formatter do?
A: This tool formats (pretty prints) JSON with proper indentation, minifies JSON to a single line, validates JSON syntax and shows errors, highlights syntax with colors, and provides an interactive tree view for exploring nested structures.
Q: Is my JSON data stored on the server?
A: No. All processing happens directly in your browser using JavaScript. Your data is never sent to any server. Everything stays completely private on your device.
Q: What is the difference between Format and Minify?
A: Format (pretty print) adds indentation and line breaks to make JSON human-readable. Minify removes all unnecessary whitespace to reduce file size, which is useful for production code and API responses.
Q: How does the Tree View work?
A: Tree View displays your JSON as an interactive, collapsible tree structure. Click the arrows to expand or collapse objects and arrays. Each node shows the key, value type, and value. This is useful for exploring deeply nested JSON data.
Q: Can it validate JSON?
A: Yes. When you click Format or Minify, the tool validates your JSON. If there is a syntax error, it shows the error message with the position where the error was found, helping you quickly fix the issue.
Q: What do the syntax highlighting colors mean?
A: Keys are shown in blue, strings in orange, numbers in green, booleans in blue, and null values in gray. This makes it easy to scan and understand the structure of your JSON data.
Q: Is there a size limit?
A: Since everything runs in your browser, there is no server limit. JSON files up to several megabytes work smoothly. Very large files may slow down syntax highlighting and tree rendering.
Q: Is this tool free?
A: Yes, completely free with no registration required. Use it as many times as you need.