Utilities

JSON Formatter / Validator

Format, validate, minify, and explore JSON with syntax highlighting and a tree view.

Input JSON

Formatted output will appear here.

About This Module

Format, validate, and explore JSON data instantly with this free, browser-based tool. Paste any JSON string to get pretty-printed output with color-coded syntax highlighting, or switch to an interactive tree view for easy navigation. All processing happens locally in your browser with no data sent to any server.

What Is JSON Formatter / Validator?

The JSON Formatter / Validator is a developer utility that processes raw JSON data in multiple ways. The format function pretty-prints compressed or unformatted JSON with consistent 2-space indentation and syntax highlighting that color-codes strings, numbers, booleans, null values, and keys for fast visual scanning. The validate function checks whether a JSON string is syntactically correct and reports the exact error position if it is not. The minify function compresses formatted JSON to the smallest possible single-line representation. The tree view renders JSON as an interactive, collapsible hierarchy that lets you expand and collapse objects and arrays to explore deeply nested structures. This tool supports all valid JSON including objects, arrays, nested structures, and all JSON data types.

How It Works

Paste your JSON into the input field. Click "Format" to instantly generate a pretty-printed version with 2-space indentation and syntax highlighting in the dark-themed output panel. Click "Validate" to check for errors — a green message confirms valid JSON, while a red message shows the specific error and position. Use "Minify" to compress the JSON into a single line for embedding in code or API calls. The "Tree View" button toggles an interactive tree display where you can click arrows to expand or collapse objects and arrays. Click "Copy Output" to copy the formatted or minified result to your clipboard.

Best Use Cases

API Development: Format API response payloads for readability during debugging, testing, and documentation of REST or GraphQL endpoints.

Configuration Editing: Validate and format config files, package.json, or settings JSON before committing to version control.

Data Inspection: Use the tree view to explore large, deeply nested JSON structures from databases, logs, or third-party integrations.

Code Optimization: Minify JSON data for embedding in production code, reducing payload size for network transfers.

Fields and Input Explanations

Input JSON: Paste or type your raw JSON data here for processing.

Format: Pretty-prints the JSON with 2-space indentation and applies syntax highlighting to the output.

Validate: Checks whether the input is valid JSON and reports any syntax errors with line and position details.

Minify: Compresses the JSON to a single line with no whitespace, ideal for embedding or transmitting.

Tree View: Toggles an interactive, collapsible tree representation of the parsed JSON structure.

Copy Output: Copies the currently displayed formatted or minified JSON to your clipboard.