What is this tool?
JSON is a structured text format used by APIs, configuration files, automation workflows, and AI tool outputs. Formatting adds indentation; minifying removes unnecessary whitespace.
How to use it
Paste JSON and select Format to validate and indent it, or Minify to create compact output for APIs, prompts, and configuration files.
Related practical guides
JSON formatting guide →Format JSON from AI output →JSON formatter for ChatGPT →Common uses
- Format compact API responses for easier reading.
- Validate configuration data before deployment.
- Minify JSON before storing or transmitting it.
Common mistakes
- JSON requires double quotes; single-quoted strings are invalid.
- Trailing commas after the last item are not allowed.
- Comments and unquoted property names are not valid standard JSON.
Practical example: Formatting an API response
Paste {"name":"Ada","active":true} and select Format to display the properties on separate indented lines.
Privacy
This tool is designed to process your input locally in the browser. Avoid entering passwords, private keys, or other sensitive production data into any online tool.
Frequently asked questions
Does formatting change my data?
Formatting changes whitespace only. Values and structure remain the same.
Why does JSON validation fail?
Common causes include trailing commas, single quotes, comments, or unquoted property names.
Can I use this for AI-generated JSON?
Yes. It is useful for checking whether AI output is valid JSON before using it in code or automation.