Developer

JSON formatter and validator

Format, minify, and validate JSON in the browser. Syntax errors show the parser message so you can find the problem quickly.

JSON

Valid JSON

{
  "hello": "world"
}

How to use

Paste JSON, then choose Format or Minify. If the text is not valid JSON, the error appears under the editor. Copy the result when it looks right.

Does this send my JSON anywhere?: No. Parsing runs with the built-in JSON parser in your browser. Close the tab and the text is gone.
Are trailing commas allowed?: No. Standard JSON does not allow trailing commas or comments. The validator follows that rule.