JSON formatter
Format, validate and minify JSON in one click
Tip: Ctrl+Enter to format
Format, validate and inspect JSON online
JSON Formatter is a free online tool to format, validate, beautify and minify JSON data. Paste your JSON and instantly get a clean, readable format with syntax highlighting. Supports nested objects, arrays, and detects errors with line numbers. No data is sent to any server — everything runs in your browser.
When to use this JSON formatter
Use it when API responses, config files, package data or logs are hard to read. The formatter turns compact JSON into an indented structure so errors and nested fields are easier to spot.
Private browser-based processing
Your JSON is parsed locally in the browser. ToolsNest does not require an account and does not upload pasted JSON to a server.
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Frequently asked questions
Can I validate JSON with this tool?
Yes. Paste JSON and run the formatter. If the JSON is invalid, the page shows the parsing error so you can fix the syntax.
Is my JSON uploaded anywhere?
No. The JSON formatter runs in your browser and does not send your input to a server.
Can I view nested JSON?
Yes. After formatting valid JSON, you can open the tree view to inspect nested objects and arrays.