Read API responses
Beautify compact response bodies while debugging integrations, webhooks and command-line output.
100% local · files never leave your browser
Format tool
JSON Formatter & Minifier
Format or minify JSON online in your browser. Beautify compact payloads, validate syntax and keep data private.
✓ Free to use✓ No signup✓ Runs locally
51 bytes · local only
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Processed entirely in this tab
Your input and result are not sent to JSON Hearth or stored on a server.
When to use it
What Formatter helps you do
Formatting adds indentation and line breaks so a compact payload is easier to read. Minifying removes unnecessary whitespace for copying or transport.
Prepare configuration
Normalize indentation before reviewing or committing JSON configuration files.
Reduce whitespace
Minify valid JSON when you need a compact representation for logs, examples or payloads.
How it works
Formatter, without the upload.
Add your data
Paste a value, open a local file or begin with the working sample.
Run the tool
The transformation executes in your browser, not on our servers.
Review the result
Check the output, then copy or download it for your next task.
Important limitations
What to check before using the result
Review required
Formatting requires syntactically valid JSON and does not silently repair malformed input.
Review required
Minification removes whitespace only; it does not compress the data or change keys and values.
Common questions
About Formatter
Does JSON Formatter & Minifier upload my data?
No. Your input is processed by code running in your browser and is not sent to an application server.
Is Formatter free to use?
Yes. The tool is free, requires no account and can be used directly in the browser.
Does formatting change JSON values?
No. Formatting changes whitespace and indentation while preserving the parsed data structure.
Can this formatter fix invalid JSON?
Use the JSON repair tool for common syntax mistakes. Review repaired output before relying on it.