JSON Formatter & Validator
Format, beautify, minify, and validate JSON data. Customize indentation to your preference.
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What is JSON Formatting?
JSON (JavaScript Object Notation) is a lightweight data interchange format widely used in web APIs, configuration files, and data storage. Raw JSON from APIs or minified sources is often a single long line that is difficult to read.
A JSON formatter (also called a JSON beautifier or pretty-printer) adds proper indentation and line breaks to make the structure visible at a glance. This tool also validates your JSON, catching syntax errors like missing commas, unmatched brackets, or trailing commas before they cause issues in your code.
You can choose between 2-space, 4-space, or tab indentation. The minify option removes all whitespace, producing the most compact representation for production use or network transfer.
How to Use
- Paste your JSON data into the input box, or click "Sample" to load example data.
- Select your preferred indentation (2 spaces, 4 spaces, or tabs).
- Click "Format" to beautify the JSON, or "Minify" to compress it.
- If there are syntax errors, they will be displayed with the specific error message from the JSON parser.
- Copy or download the result.
FAQ
Does it fix invalid JSON automatically?
No. This tool validates and formats valid JSON only. If your JSON has syntax errors (like trailing commas or single quotes), you need to fix them manually. The error message will point you to the approximate location of the issue.
What is the maximum JSON size supported?
Since everything runs in your browser, the limit depends on your device's available memory. Most modern browsers can handle JSON files up to 50-100 MB without issues.
Does minification change the data?
No. Minification only removes whitespace (spaces, tabs, newlines). The actual data values remain identical. You can format a minified JSON and get back the same structured output.