How to Use
- 1.
Paste JSON into the input editor.
- 2.
Click Format JSON to validate and beautify the data with readable indentation.
- 3.
Use Minify JSON when you need compact one-line output.
- 4.
Review any validation error message and line or column hint.
- 5.
Copy the clean JSON or download it as a .json file.
- 6.
Use the sample button if you want to test the formatter quickly.
Features
JSON formatter and beautifier
JSON validator with readable error messages
Line and column estimate for invalid JSON
JSON minifier for compact output
Object, array, key, and value-type summary
Copy formatted or minified JSON
Download output as a .json file
Private browser-based processing without upload
Frequently Asked Questions
How do I format JSON online?+
Paste your JSON into the input box and click Format JSON. The tool validates the data and creates a readable indented version if the JSON is valid.
Can this tool validate JSON errors?+
Yes. If the JSON is invalid, it shows a validation error and attempts to estimate the line and column where parsing failed.
What is JSON minify?+
JSON minify removes unnecessary spaces and line breaks from valid JSON, creating a compact version that is useful for storage, APIs, or configuration files.
Can I use this for JSON-LD schema markup?+
Yes. You can paste JSON-LD code to check whether the JSON itself is valid before adding it to a page. This does not replace full structured-data testing.
Is my JSON uploaded to a server?+
No. Formatting, validation, minifying, copying, and file generation happen locally in your browser.
Why does valid JavaScript object syntax fail as JSON?+
JSON is stricter than JavaScript object syntax. Keys must use double quotes, strings must use double quotes, and trailing commas are not allowed.
About this tool
Free JSON Formatter & Validator
Use this free JSON Formatter and Validator Online to clean, beautify, minify, and validate JSON data directly in your browser. Paste JSON from an API response, config file, webhook payload, schema markup, app settings, package file, or copied developer output, then instantly check whether the JSON is valid and convert it into readable formatted output. JSON is strict. A missing comma, extra comma, unquoted key, mismatched bracket, or broken string can stop an API request, application setting, automation workflow, or structured data snippet from working correctly. This tool helps you catch those issues faster by showing validation status, a readable error message, and a line and column estimate when possible. Once the JSON is valid, you can beautify it with indentation, minify it for compact storage, copy it to your clipboard, or download it as a .json file. The formatter is useful for developers, API testers, automation builders, WordPress users, SEO teams working with JSON-LD schema, students learning JSON, and anyone who needs to review nested data without reading one long line. It also shows a small summary of objects, arrays, keys, strings, numbers, booleans, null values, and output size so you can understand the shape of the data before using it. All formatting and validation runs locally in your browser. Your pasted JSON is not uploaded to WebToolsEdge for processing. Review the output before using it in production, especially when JSON contains private API data, configuration secrets, or customer information.
Working with structured data for SEO? After validating JSON syntax here, review page markup with the SEO Analyzer. If you are converting copied HTML content for documentation, try the HTML to Markdown Converter, or browse more Developer Tools.