JSON Formatter
Beautify and format JSON with syntax highlighting
How It Works
Select Your File
Upload, drag & drop, or paste directly from clipboard.
Configure Options
Set quality level and output format.
Download Result
Processed entirely in your browser. Download instantly.
About JSON Formatter
Paste raw or minified JSON and instantly get a beautifully formatted, syntax-highlighted output with configurable indentation (2 spaces, 4 spaces, or tab). The formatter validates the JSON as it formats and highlights any syntax errors with line numbers. Collapsible tree-view navigation lets you explore deeply nested objects. Copy the formatted output with one click. Runs entirely in your browser –no data is sent to a server. Ideal for developers debugging API responses, reading configuration files, or preparing JSON for documentation. Handles large JSON payloads efficiently using streaming tokenisation.
Frequently Asked Questions
Can I collapse and expand nested objects?
Yes. The tree view allows you to collapse any object or array to reduce visual noise.
What indentation options are available?
Choose 2 spaces, 4 spaces, or a tab character for indentation.
Is my JSON data kept private?
Yes. All formatting happens in your browser –no data is ever sent to a server.
What is JSON formatting?
JSON formatting (also called "pretty printing") adds whitespace, indentation, and line breaks to make JSON data human-readable. API responses are often minified for efficiency — formatting makes them readable for debugging.
Can FileCraft validate JSON?
Yes. The formatter highlights JSON syntax errors in real time as you type. Invalid JSON is clearly marked so you can find and fix the issue.
Can I minify JSON?
Yes. Use the Minify button to remove all whitespace and produce compact JSON for use in APIs or storage.
Does FileCraft support JSON5 or JSONC (JSON with comments)?
Standard JSON only (RFC 8259). JSON5 and JSONC are not valid JSON and are not supported.
Privacy & Security
All JSON formatting happens locally in your browser. JSON data may contain API keys, user data, or proprietary business logic — none of it is transmitted to any server.
FileCraft uses the browser's built-in JSON.parse() and JSON.stringify() with indentation for formatting. Syntax highlighting uses a custom tokenizer.