ToolPDFsJSON Formatter
Format or minify JSON instantly using browser-side parsing.
Output
{
"name": "ToolPDFs"
}How it works
Unformatted JSON is nearly impossible to read at a glance. A long string of keys, values, and nested objects collapsed into a single line becomes hard to audit, debug, or share with a colleague. ToolPDFs JSON Formatter takes raw or minified JSON and prettifies it with consistent indentation and line breaks so the structure is immediately clear. It also validates the input and highlights any syntax errors before you try to use the data in code.
The tool runs entirely in your browser using the native JSON.parse and JSON.stringify methods. Nothing is sent to a server, which makes it safe to paste credentials, internal API responses, configuration files, and other sensitive data without risk.
Paste your JSON, choose prettify or minify, and the formatted output is ready to copy in milliseconds. JSON Formatter is particularly useful for developers reviewing API responses, operations engineers reading config files, and anyone who has copied JSON from a terminal and wants to understand its structure quickly. It is free to use with no account required.
Features
- Prettify minified JSON with consistent indentation and line breaks.
- Minify formatted JSON to a compact single line string.
- Syntax validation catches errors before you use the data in code.
- Runs locally in your browser. Paste sensitive API keys or config files safely.
- One click copy to clipboard of the formatted output.
Frequently asked questions
Is it safe to paste credentials or API keys into this formatter?
Yes. The tool runs entirely in your browser using native JavaScript. Nothing is sent to a server, so your data never leaves your device.
Will the formatter tell me if my JSON is invalid?
Yes. The tool validates the JSON before formatting and will show an error message if it detects a problem such as a missing comma, unmatched bracket, or unquoted key.
Can I minify JSON to reduce its size?
Yes. Switch to minify mode to collapse all whitespace and produce a compact single line string, useful for embedding JSON in code or reducing payload size.
Does this support JSON5 or comments?
No. The formatter uses the standard JSON specification. JSON5 syntax and JavaScript style comments will cause a parse error.
Is there a size limit for JSON input?
There is no server side limit. Very large JSON documents may slow the browser tab due to memory constraints, but no cap is imposed.