About JSON Formatter & Validator
JSON is the data format behind almost every API and web app, but raw JSON from an API is often one long unreadable line. This formatter pretty-prints it with indentation, minifies it back to a compact line for production, and validates it with a clear error message when something is wrong.
Validation happens in your browser with the built-in JSON parser, so the error messages match what your own code would report. Nothing is sent to a server.
How to use it
- Paste your JSON into the input box.
- Press Format for readable output, Minify for compact output, or Validate only to check it.
- Copy the result into your code or API tool.
Frequently asked questions
What does Format do?
It reprints your JSON with 2-space indentation, so nested objects and arrays are easy to read and debug.
What does Minify do?
It removes all unnecessary spaces and line breaks, producing the smallest valid JSON - useful for sending data or storing it.
My JSON is invalid - what is wrong?
The most common causes are a missing comma, an extra trailing comma, single quotes instead of double quotes, or unquoted keys. The error message names the problem.
Is my JSON uploaded?
No. Formatting and validation run entirely in your browser.