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.

JSON Formatter / Validator

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

JSON input

Indent

Result

How to use JSON Formatter / Validator

Paste your JSON.
Click Format, Minify, or Validate.
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.

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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