JSON Formatter & Validator

A JSON formatter (also called a JSON beautifier or JSON pretty-printer) takes raw, minified, or poorly indented JSON data and reformats it with proper indentation, line breaks, and spacing. This makes the data human-readable and easy to inspect, debug, and share.

JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. APIs, configuration files, databases, and logging systems all produce JSON — but it's often compressed into a single line to save bandwidth, making it nearly impossible to read without formatting.

Our JSON formatter goes beyond basic formatting: it also supports JSON5 and JSONC (JSON with Comments), handles syntax validation, minification, and provides an interactive collapsible tree view for exploring deeply nested structures. All processing happens entirely in your browser — your data never leaves your machine.

1. Paste your JSON — Copy your JSON data into the input field on the left. The formatter accepts standard JSON, JSON5, and JSONC (with comments).
2. Choose your action — Click "Format" to pretty-print with indentation, "Minify" to compress into a single line, or "Validate" to check syntax without changing the data.
3. Select indentation — Choose between 2 spaces, 4 spaces, or tab indentation depending on your project's style guide.
4. Explore the tree view — Switch to Tree View mode to navigate your JSON structure interactively. Expand and collapse nodes to drill into nested objects and arrays.
5. Copy the result — Click "Copy" to copy the formatted output to your clipboard, ready to use in your code or documentation.

• JSON5 & JSONC support — Format files with comments, trailing commas, unquoted keys, and other JSON5 extensions.
• Interactive tree view — Explore deeply nested JSON with an expandable/collapsible tree. Each node shows its type (object, array, string, number, boolean, null) and a value preview.
• Syntax highlighting — Color-coded keys, strings, numbers, booleans, and null values for quick visual scanning.
• Validation with error reporting — Detailed error messages pinpointing exactly where your JSON is broken, including line and column numbers.
• Minification — Compress JSON by removing all whitespace for production use or API payloads.
• 100% client-side — Your data never leaves your browser. No server, no uploads, no tracking.

• Debugging API responses — Paste a raw API response to quickly inspect its structure and find the data you need.
• Formatting config files — Clean up messy configuration files (package.json, tsconfig.json, etc.) with consistent indentation.
• Validating JSON payloads — Verify that your JSON is syntactically correct before sending it to an API or storing it in a database.
• Minifying for production — Compress JSON data to reduce file size for production deployments and faster network transfers.
• Learning JSON structure — Use the tree view to understand complex nested data structures visually.
• Working with JSONC/JSON5 — Format configuration files that use comments (like VS Code settings) or JSON5 syntax.