What does this JSON formatter do?

It formats JSON, validates syntax, and displays the output in a readable structure directly in the browser.

Can I use this as a JSON validator?

Yes. If the input has invalid JSON syntax, the tool clearly reports it instead of outputting formatted data.

Clean browser-based formatter

JSON Formatter Online

Format JSON online, validate JSON syntax, and pretty-print API payloads without leaving your browser. This page is optimized specifically for people looking for a JSON formatter or JSON validator.

Structured formatting

JSON formatter workspace

Indentation

Paste JSON

Formatted output

{
  "name": "DevToolHive",
  "active": true,
  "users": 128,
  "features": [
    "format",
    "validate",
    "convert"
  ]
}

Why this page is useful

Works as a JSON formatter and JSON validator in one place
Highlights keys, strings, numbers, booleans, and null values for easier reading
Keeps formatting work quick on desktop and mobile

Explore formatting tips, debugging notes, and validation guidance in the companion article: JSON Formatter Best Practices