About Free Online JSON Formatter & Indenter (JSONC, JS Objects, JSONL)
The Free Online JSON Formatter & Indenter is an advanced, ultra-tolerant utility designed for developers, integration engineers, and data analysts. Unlike standard strict formatters that fail on the slightest syntax issue, our smart preprocessor sanitizes and formats a wide variety of format variations.
Key features include:
* **JSON with Comments (JSONC):** Automatically strip single-line (//) and block (/* */) comments, perfect for formatting configuration files like tsconfig.json or VS Code settings.
* **Loose JS Object Literals:** Convert raw JavaScript/TypeScript objects to valid JSON by quoting unquoted object keys and converting single quotes to double quotes.
* **Trailing Commas Removal:** Clean up trailing commas at the end of objects and arrays, a common copy-paste artifact from modern JS codebases.
* **Escaped JSON String Unescaping:** Instantly parse and format stringified JSON payloads copied directly from server application logs (containing raw \" characters).
* **JSON Lines & Concatenated Objects:** Detect and merge multiple sequential JSON objects or JSONL files into a single, perfectly structured JSON array.
Everything runs completely inside your web browser using client-side JavaScript. None of your data, variables, credentials, or API logs are ever uploaded to a remote server, ensuring total data privacy.
Real-World Use Cases
Configuration Formatting
Format files with comments like tsconfig.json or system settings files seamlessly.
Loose Code Normalization
Convert JavaScript object declarations copied from source code directly into valid JSON arrays or objects.
Log Payloads Formatting
Unescape and pretty-print JSON payload string strings copied directly from application crash logs.