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Format and validate JSON data. Free, private, runs in your browser.
JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. APIs, configuration files, databases, and messaging systems all use JSON to structure data. It's human-readable in theory, but in practice, minified or deeply nested JSON is nearly impossible to read without proper formatting.
API responses are often returned as a single line of minified JSON. Configuration files accumulate messy indentation. Debugging requires inspecting nested structures quickly. A JSON formatter pretty-prints the data with proper indentation, making structure immediately visible. It also validates the JSON and highlights syntax errors.
Paste your JSON and Convertful instantly parses, validates, and pretty-prints it with 2-space indentation. Invalid JSON triggers a clear error message with the location of the syntax problem. You can also minify formatted JSON for production use. Everything runs in your browser.
Yes. Your JSON data is processed entirely in your browser. This is important since JSON payloads often contain API keys, user data, or other sensitive information.
Pretty-print (beautify) JSON with proper indentation, minify it to a single line, and validate for syntax errors.