JSON Formatter & Validator
A tool to format and validate JSON before using it in your projects or sending it through APIs. It catches common syntax errors and pinpoints them by line and column, with beautify options of 2 or 4 spaces and one-line minify. All processing happens locally in your browser.
How to use
- Paste your JSON into the input box.
- Press Format for 2-space indent, Format 4 spaces, or Minify to strip whitespace.
- Use Validate only to check correctness without changing the text.
- Copy the result with the Copy button or reset with Clear.
Frequently asked questions
What are the most common JSON errors?
A trailing comma before a closing bracket, single quotes instead of double quotes, and unquoted keys. The validator catches all of these and reports their approximate position.
What is the difference between formatting and minifying?
Formatting re-indents the code with line breaks so it is easy to read and review, while minifying removes all unnecessary whitespace to shrink the payload for transport or storage.
Is my data sent to a server when validating?
No. Parsing and formatting run entirely in your browser, so you can safely check sensitive data.
What does the line and column in the error mean?
When parsing fails, the tool extracts the error position from the parser message and converts it to a line and column number, taking you straight to the problem instead of scanning the whole text.