Paste your JSON or upload a file
Paste JSON into the input box or upload a JSON or text file using the upload area.
Free JSON Formatter & Validator
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.
Valid JSON only. The tool will validate and then format or minify.
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
Everything runs in your browser. No account, no software, no data leaving your device.
Format or minify your JSON
Click Format JSON to prettify with indentation, or Minify JSON to produce compact single-line output. The tool validates your JSON first.
Review validation results
If the JSON is valid, you’ll see a success message and the formatted or minified output. If not, you’ll see a clear error with details.
Copy or download
Copy the output to your clipboard or download it as a JSON 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
A JSON formatter (or beautifier) takes minified or messy JSON and adds indentation and line breaks so it’s easy to read. This tool also validates your JSON and can minify it to a single line.
Paste your JSON or upload a file, then click Format JSON or Minify JSON. The tool parses the input and shows a success message if it’s valid, or an error message with details if it’s invalid.
You’ll see a clear error message describing the problem. Many errors include position or line information so you can fix the JSON. No output is produced until the JSON is valid.
Yes. Click Minify JSON to convert valid JSON into a single compact line with no extra spaces or line breaks. Useful for smaller payloads or file size.
No. Everything runs locally in your browser. Your JSON is never sent to a server.
Yes. The JSON formatter and validator is free to use with no signup required.
Yes. Paste API response JSON to validate and prettify it, or paste config JSON to format and clean it up. The tool accepts any valid JSON.