JSON Formatter Online
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Jsonic's JSON Formatter is a free, browser-based tool that formats, validates, and minifies JSON instantly. Paste any JSON string and click Format to apply 2-space indentation. Click Validate to check for syntax errors without reformatting. Click Minify to compress JSON into a single line for use in APIs or config files. All processing happens locally — your data is never uploaded.
How to format JSON online
- Paste your JSON into the left panel, or click Upload to load a file.
- Click Format to beautify with 2-space indentation.
- Click Validate to check for syntax errors.
- Click Minify to compress the JSON into a single line.
- Click Copy or Download to save the result.
FAQ
Is my JSON uploaded to a server?
No. All processing happens in your browser. Nothing is sent to any server.
What is the maximum file size?
There is no hard limit — it depends on your browser memory. Files up to 10 MB work without issues in most browsers.
What is the difference between Format and Minify?
Format adds indentation and line breaks to make JSON readable. Minify removes all whitespace to reduce file size — useful for APIs and config files.
Can I validate JSON without formatting it?
Yes. Click Validate to check syntax without changing the indentation of your input.
What indentation options are available?
You can choose 2, 3, or 4 spaces. Click the indent number buttons in the toolbar.
How do I upload a JSON file?
Click Upload in the toolbar and select a .json or .txt file from your computer.
Can I share my formatted JSON with someone?
Yes. Click Share to copy a URL that contains your JSON encoded in the fragment. When the recipient opens the link, their formatter is pre-loaded with your data. The data never touches a server.
What does the Tree view do?
Tree view renders your JSON as a collapsible node tree — useful for exploring large nested objects without scrolling through formatted text.