Format, minify, validate, and convert JSON - free, no signup required.
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JSON Full Form
JSON stands for JavaScript Object Notation. It is a lightweight, text-based, language-independent data interchange format derived from JavaScript, used to transmit structured data between servers and web applications.
What this tool does
Format / Beautify - Indent JSON with 2, 3, 4 spaces or tabs for readability.
Minify / Compact - Strip whitespace to reduce payload size.
Validate - Check syntax and pinpoint the offending line on error.
Convert - Transform JSON to XML, CSV, TSV, YAML, or plain text.
Tree View - Explore JSON as a collapsible tree.
Privacy
Everything runs locally in your browser. Your JSON, uploaded files, and URL responses are never sent to our servers.
Frequently Asked Questions
Is my JSON data sent to any server?
No. All formatting, validation, and conversion happens entirely in your browser using JavaScript. Your data never leaves your machine. The only exception is the Load URL feature, which fetches the URL you explicitly provide.
What is the difference between formatting and minifying JSON?
Formatting (pretty-printing) adds indentation and line breaks to make JSON easy to read. Minifying strips all unnecessary whitespace to produce the smallest possible string. Both operations preserve the exact semantic content.
Why is my JSON invalid?
The most common JSON errors are: single quotes instead of double quotes, trailing commas, unquoted keys, JavaScript comments, or undefined/NaN/Infinity values. Click Validate to see the exact line and column of the offending token.
How do I convert JSON to CSV, XML, or YAML?
Paste your JSON into the input pane, then click the Convert JSON to dropdown and pick your target format. The result appears in the output pane, which you can copy or download.
What is JMESPath and when should I use it?
JMESPath is a query language for JSON - think of it as XPath for JSON or jq in the browser. Use the Transform button to filter, sort, or reshape a large document. Visit jmespath.org for the interactive tutorial.
Is there a size limit for JSON I can paste?
There is no hard limit, but browser performance will degrade with very large payloads (several MB or more). For most real-world API responses the tool stays responsive.
