Guides / Format JSON Online
How to Format JSON Online (Safely)
Messy or minified JSON is hard to debug. A JSON formatter adds indentation and line breaks so you can inspect API responses, config files, and payloads quickly — without installing an editor plugin.
Open the free JSON Formatter →
Why format JSON in the browser?
Online formatters are convenient, but many upload your payload to a server. That is risky for tokens, PII, or internal API data. DevUtil formats JSON entirely in your browser, so the content never leaves your device.
Step-by-step
- Open the JSON Formatter.
- Paste raw or minified JSON.
- Beautify to pretty-print, or minify for compact output.
- Fix validation errors if the parser highlights syntax issues.
- Copy the result back into your editor, ticket, or docs.
Common JSON errors
- Trailing commas after the last property
- Single quotes instead of double quotes
- Unquoted object keys
- Unescaped backslashes in Windows paths or regex
Related workflows
- Convert structured data with the JSON ↔ CSV Converter
- Compare two payloads with the Diff Checker
- Move configs with the YAML ↔ JSON Converter