What this tool does
Privacy behavior
Selected file contents are processed locally in your browser for supported workflows. This privacy build does not intentionally load ads, analytics, remote fonts, or third-party runtime scripts.
JSON Formatter
Format, validate, and minify JSON locally in your browser.
Local developer tool
Paste JSON and clean it up.
Input characters: 0
When should you format JSON?
This tool validates strict JSON. It does not repair invalid JSON or accept JavaScript-style comments, trailing commas, or unquoted keys.
Frequently Asked Questions
Is this JSON Formatter free?
Yes. You can format, validate, minify, copy, and download JSON without signup.
Is my JSON uploaded?
No. Parsing and formatting run locally in your browser.
Does it support Unicode and emojis?
Yes. JSON.parse and JSON.stringify preserve valid Unicode strings and emojis.
Can it fix invalid JSON?
No. It validates strict JSON and shows an error so you can fix the source manually.
What indentation should I use?
Two spaces are common for web projects, four spaces are easier to read, and tabs are useful when your project requires them.
Privacy
Privacy build: This build removes ads, analytics, remote fonts, runtime CDN scripts, and file-operation telemetry. Selected files are processed in the browser using local JavaScript and browser APIs.
ConvertUnlimited does not provide a server-side upload endpoint for this JSON formatting flow. JSON input and selected files are processed locally in your browser.
Terms of Use
ConvertUnlimited is provided as is. Always review formatted JSON before using it in production systems.
Privacy & processing