JSON Formatter
Beautify, minify, validate JSON and explore it as a tree.
Deep Dive
The JSON Formatter is a comprehensive tool for developers and data engineers to handle JSON data efficiently. It allows you to transform messy, unreadable JSON into a beautifully formatted structure with customizable indentation. Beyond just 'prettifying', the tool validates your JSON in real-time, highlighting exact line numbers and error positions to help you debug quickly. For large datasets, the interactive 'Tree View' provides a navigable interface where you can collapse and expand nodes to focus on specific parts of the data. You can also minify your JSON to reduce payload sizes for API testing or production use. All processing happens on the client side, ensuring your data remains private and secure. Whether you're debugging a REST API response or cleaning up a configuration file, this tool provides the utility and speed required for a modern development workflow.
Who uses this?
- Debugging a malformed API response
- Reading a minified configuration file from a build artifact
- Validating JSON before committing to a repository
- Exploring a deeply nested JSON structure interactively
Examples
Input
{"name":"Alice","age":30,"city":"Chennai"}Output
{
"name": "Alice",
"age": 30,
"city": "Chennai"
}Common Errors & Fixes
Unexpected token at line N
Look for a trailing comma after the last item in an array or object — JSON does not allow trailing commas.
Keys are not quoted or use single quotes
JSON requires all keys and string values to use double quotes. Replace `'key'` with `"key"`.
Formatter outputs nothing for a seemingly valid input
Check for a byte-order mark (BOM) at the start of the pasted text. Copy the JSON again from the source.
Expert FAQ
Why is my JSON showing an error?
Common issues include missing quotes around keys, trailing commas, or unclosed brackets. Our validator will point you to the exact line to fix.
What is the benefit of the Tree view?
The Tree view is ideal for large JSON objects where you need to selectively expand deep nesting without being overwhelmed by the entire text.
Is there a limit to the size of JSON I can format?
The limit is generally determined by your browser's memory. We have optimized the formatter to handle multi-megabyte JSON files smoothly.