JSON Formatter & Validator
Paste raw or messy JSON to beautify it with proper indentation, validate the syntax, or minify it down to a single line. The tool runs locally in your browser, so even sensitive payloads from APIs or logs stay on your machine. It's a great helper for backend developers, mobile engineers, QA testers and anyone working with REST APIs or configuration files.
Frequently Asked Questions
What does the JSON formatter do?
It parses your JSON, validates the syntax, and re-prints it with consistent indentation. You can also minify it down to a single compact line.
How are errors reported?
If the JSON is invalid, the tool shows the parse error message produced by JSON.parse, which usually points at the position of the issue.
Is my JSON sent to a server?
No. Parsing and formatting happen entirely in your browser, so confidential data stays on your machine.
What indentation styles are supported?
You can choose 2 spaces, 4 spaces or tab indentation when beautifying.