Paste or upload your JSON
Paste JSON into the input or upload a file. The tool will automatically detect and validate it.
JSON Formatter & Validator
Format, validate, prettify, and minify JSON instantly in your browser. Paste JSON or upload a file and get clean, readable output or compact minified JSON in seconds. Fast, free, and private.
Or upload a JSON or text file
Processed entirely in your browser
Results
JSON is processed entirely in your browser and is never uploaded to any server.
HOW IT WORKS
How to format or validate JSON
Paste your JSON, format or validate it instantly, and copy or download the result. Everything runs in your browser with no uploads or data leaving your device.
Format or validate your JSON
Format JSON for readability or minify it for compact output. Errors are highlighted if the JSON is invalid.
Copy or download the result
Copy the formatted JSON or download it as a file.
Why use this tool
Why Use a JSON Formatter and Validator?
JSON is used everywhere: APIs, config files, and data exports. When it’s minified or malformed, it’s hard to read and debug. A JSON formatter makes it readable; a validator catches errors before you send or save.
This tool is useful when you need to:
Make JSON readable for debugging
Prettify minified API responses or config files so you can inspect structure and spot issues quickly.
Validate payloads before using APIs
Check that your request or response JSON is valid before sending or parsing it in code.
Clean up config files
Reformat JSON config files for consistent indentation and easier editing.
Minify for compact output
Produce single-line JSON when you need smaller payloads or file size.
Privacy
Private and Secure
Your JSON and pasted data are never uploaded to a server. This formatter and validator runs entirely in your browser using client-side processing.
Data stays on your device
Your data never leaves your browser. No uploads, no cloud storage, no logs.
Nothing stored or sent
No files are stored or transmitted. Formatting and validation happen only in memory.
Fast and private
Formatting and validation are instant and run locally at full browser speed.
FAQ
Frequently asked questions
Paste your JSON or upload a file, then click Format JSON or Minify JSON. Valid input is formatted or minified; invalid input shows an error with details. No output is produced until the JSON is valid.
Yes. Formatting and validation run in your browser. Works for API responses, config files, or any JSON text.
You see an error message with the problem (e.g. position or line). Fix the JSON and try again; no output is produced until it is valid.
Yes. Processing runs locally in your browser. Nothing is uploaded or stored.
Yes. Click Minify JSON. Valid JSON is turned into one line with no extra spaces or line breaks. Useful for smaller payloads.