Developer & Data
JSON Formatter
Validate and format your JSON payload so it's readable, or minify it to save space.
FreeRuns in your browserNo sign-up
How to format and validate JSON
- Step 1: Paste your raw, minified, or unformatted JSON into the input editor.
- Step 2: Click Format to beautify the structure with clean 2-space or 4-space indentation.
- Step 3: Inspect any syntax errors highlighted with exact line and column coordinates.
JSON formatting tools
- Instant JSON validation pinpointing missing commas, trailing brackets, and unquoted keys.
- Beautify mode with customizable indentation (2 spaces, 4 spaces, or tabs).
- Minify mode strips whitespace and newlines for compact network payloads.
- Collapsible tree view lets you expand and collapse nested objects and arrays easily.
Frequently asked questions
Why is trailing comma an error in JSON?
Unlike standard JavaScript object literals, the strict JSON specification (RFC 8259) forbids trailing commas after the last key or element.
Can I minify JSON to reduce file size?
Yes, click the Minify button to remove all spaces, tabs, and newlines, reducing payload size for APIs and web storage.
Is my JSON payload kept secure?
Yes, the parser runs entirely on your local machine using the native browser JSON engine. Your sensitive data is never transmitted online.