Developer4 min read
How to Format and Validate JSON Online
Use JSON formatting, validation and minification tools to clean API responses, config files and structured data safely.
Recommended tool
Open JSON FormatterFormat JSON for readability
Formatted JSON is easier to scan, review and debug. It helps reveal nested objects, arrays and incorrect structure when working with APIs or config data.
Validate before using
JSON must use double quotes around keys and strings, cannot contain trailing commas and must follow strict syntax rules. Validate before copying data into code or tools.
Minify only when needed
Minified JSON is useful for smaller payloads, but harder to read. Keep a readable version for editing and a minified version for deployment if needed.
Quick checklist
- Format JSON before reviewing it
- Validate syntax before using it
- Minify only after editing is complete
- Never paste secrets into untrusted tools