JSON Formatter / Validator

About JSON Formatter / Validator

OptiPix JSON Formatter is a comprehensive JSON tool for developers. Paste or type JSON to beautify it with customizable indentation (2 spaces, 4 spaces, or tabs), or minify it by removing all whitespace. The validator provides precise error messages with line and column numbers when your JSON is invalid. View your JSON as an expandable/collapsible tree with color-coded data types — strings (green), numbers (orange), booleans (purple), null (gray), with key counts for objects and array lengths. Click any value to see its JSONPath (e.g., $.users[0].name). Search for keys or values within the JSON. Upload .json files by dropping them onto the tool. See stats including object count, key count, and byte size. Copy formatted or minified JSON, or download as a .json file. Everything runs locally in your browser.

How It Works

Formatting uses JSON.stringify(JSON.parse(input), null, indent). Minification uses JSON.stringify(JSON.parse(input)). Validation wraps JSON.parse() in a try-catch and extracts error position from the exception message. The tree view recursively renders the parsed object with expand/collapse controls.

Use Cases

• •Format API responses for debugging and inspection
• •Validate JSON configuration files before deployment
• •Minify JSON payloads to reduce transfer size
• •Explore complex JSON structures with the tree view
• •Search for specific keys or values in large JSON documents