JSON Formatter
Format and validate JSON.
About the JSON Formatter
JSON (JavaScript Object Notation) is the default data format for APIs, config files, and many admin exports. When JSON is minified into one long line — or broken by a missing comma — it becomes hard to read and easy to mis-edit. This formatter pretty-prints JSON with indentation and helps you spot syntax problems before they hit production.
When you need it
- Debugging an API response in the browser or logs
- Cleaning a config file before committing it
- Checking whether a string is valid JSON at all
- Preparing a readable sample for documentation
How to use
- Paste your JSON into the input area.
- Run format / pretty-print.
- If validation fails, fix the reported syntax issue (comma, quote, bracket).
- Copy the formatted output into your editor or ticket.
Common JSON errors
- Trailing commas after the last property (invalid in standard JSON).
- Single quotes instead of double quotes around keys/strings.
- Unescaped characters inside strings.
- Comments (
//) — allowed in some configs, not in strict JSON.
Tips
- Keep secrets out of shared formatters when the data is sensitive; prefer local tooling for private payloads.
- After formatting, minify again only for transport if you need smaller payloads.
- Compare related tools: use a JSON minifier for size, and CSV/JSON converters when exchanging spreadsheet data.
FAQ
Is formatted JSON different from minified JSON? No — same data, different whitespace. Parsers ignore insignificant whitespace.
Can I format JSON5 or JSONC? Those dialects allow extras (comments, trailing commas). Stick to strict JSON here unless your stack explicitly supports extensions.