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JSON Formatter & Validator

Format, minify, or validate any JSON in your browser. Choose indent style and see error details for invalid input.

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name — top-level property

address.city — nested property (dot notation)

skills[0] — specific array index

skills[*] — all items in an array

users[*].name — property of every item in an array

Note: Simple dot/bracket notation only. Arrays support [*] for wildcard and [N] for index.

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How to use JSON Formatter / Validator

  1. Paste your JSON.
  2. Click Format, Minify, or Validate.
  3. Copy the result.

What is JSON Formatter / Validator?

Pretty-print JSON for readability, minify it for transmission, or validate that an input parses cleanly. Validation surfaces parser errors and the position where parsing failed. All processing is local — your data never leaves your browser.

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FAQ

Does it support large files?
Yes — handles JSON up to several megabytes comfortably in modern browsers.
What standards does it follow?
Strict RFC 8259 JSON. Comments and trailing commas are not allowed.

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Author

MW
Marcus Webb"The DevTool Craftsman"

Full-Stack Developer & Tools Architect

Marcus has been writing code since the dial-up era. He has contributed to open-source developer tools, built CI/CD pipelines for startups, and debugged production incidents at 3 AM more times than he would like to admit. His philosophy is that the best developer tool is the one that gets out of your way, and he writes about practical tooling that helps teams ship faster with fewer headaches.

📖 JSON Formatter / Validator on Wikipedia·Developer Tools on Wikipedia·JSON Formatter / Validator on Britannica

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