JSON Formatter

JSON is a text format that APIs, config files, and many apps use to store structured data as nested objects and arrays. When JSON is minified or comes back from an API as one long line, it's hard to read by eye. A formatter adds line breaks and indentation to reveal the structure, or does the opposite with Minify to strip whitespace for production use. This tool also validates whether the text is syntactically correct JSON.

Developers inspecting an API response during debugging, students learning how data is structured in web development, and anyone pasting a config file from a webhook, log, or documentation page that arrived as a single unreadable line.

Format adds line breaks and indentation so nested objects and arrays are easy to read. Minify strips all extra spaces and newlines to produce the smallest valid JSON string, which is what you'd ship in production.

No. Parsing and formatting happen entirely in your browser tab. We do not log or store what you paste.

Very large payloads may slow or freeze the tab because the whole document is held in memory. Split huge files into smaller pieces or use a desktop editor for multi-megabyte logs.

Validate tells you that parsing failed and roughly where, but it won't guess a missing comma or quote for you. Fix the specific error shown, then format again.

Trailing commas, missing quotes around keys, unescaped quotes inside strings, and mismatched brackets are among the most common issues Validate will flag.