JSON Formatter & Validator — Pretty Print, Minify, Convert to CSV
Format, validate, minify and convert JSON data instantly. Paste your JSON or CSV below and transform it in your browser — no server, no sign-up.
How to Use the JSON Formatter
JSON (JavaScript Object Notation) is the most common data format used by APIs, configuration files, and modern databases. This tool helps developers and non-developers alike read, validate, and convert JSON data without installing anything.
What Each Button Does
- Format JSON: Adds indentation and line breaks so nested data is easy to read.
- Minify JSON: Removes all unnecessary whitespace to create the smallest possible JSON file.
- Validate: Checks whether your input is valid JSON and reports the exact location of any syntax error.
- JSON → CSV: Converts a JSON array of objects into a comma-separated values file.
- CSV → JSON: Converts a CSV file into a JSON array of objects using the first row as headers.
Common Use Cases
Developers debugging API responses paste raw JSON into the formatter to make it readable. Data analysts convert JSON exports from web apps into CSV for Excel or Google Sheets. Web admins minify JSON configuration files to reduce file size. Students learning APIs use the validator to understand why a JSON payload is rejected.
Privacy
All processing is done locally in your browser. Your JSON or CSV data is never uploaded, stored, or logged. This makes the tool safe for sensitive data such as API keys, customer records, or configuration secrets.