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Developer Tools
Paste minified or messy JSON and get back beautifully indented, syntax-highlighted output. Supports custom indentation, key sorting, collapsible tree view, and one-click copying.
Follow these simple steps to get instant, accurate results directly in your browser:
Paste your raw or minified JSON string into the code editor.
Select 2-space, 4-space, or tab indentation, and optionally toggle key sorting.
Click 'Format JSON' to format the code, or click 'Copy' to grab the formatted output immediately.
The JSON Formatter (JSON Prettifier) transforms dense, minified, or disorganized JSON data into cleanly indented, human-readable code. It formats objects and arrays with configurable 2-space or 4-space indentation, sorts object keys alphabetically, and validates syntax in real time.
Conforming strictly to the ECMA-404 JSON Data Interchange Standard and RFC 8259, our formatter parses strings using high-performance streaming parsers. It accurately highlights syntax errors—such as missing quotes, trailing commas, unescaped control characters, or unclosed brackets—pointing directly to the line and column number where the violation occurred.
Because developers frequently work with private API keys, user tokens, and confidential production payloads, this tool runs 100% in your browser's local sandbox with zero server-side telemetry or logging.
Ensures valid UTF-8 JSON compliance and pinpoints subtle syntax flaws.
Alphabetizes dictionary keys recursively for easy structural comparison.
Instantly switch between compact single-line minification and 2/4-space indentation.
Your API tokens and sensitive database exports never leave your browser.
Inspect complex, nested REST or GraphQL API responses returned by production servers.
Clean up package.json, tsconfig.json, and launch configuration files before git commits.
Prettify unstructured BSON and JSON documents exported from MongoDB, Firestore, or Postgres.
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