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Toolmigo

JSON Formatter

Format, minify, escape and validate JSON. Line+column error locations when invalid. Runs entirely in your browser.

100% Private

Runs entirely in your browser

Instant

Real-time processing

No Limits

No character limits

0 characters

0 characters

Why Use JSON Formatter?

Debug API Responses

Paste a one-line JSON blob from a log or curl and see it cleanly indented.

Validate Configs

Catch trailing commas and unquoted keys before they break a deploy.

Embed in Code

Escape JSON to drop into a string literal, or unescape it back to readable form.

About JSON Formatter

JSON Formatter covers the four operations you reach for daily — format, minify, escape and validate. Parsing uses the browser's native JSON engine, so it's strict about the spec: comments, trailing commas, single quotes and unquoted keys are all rejected.

When parsing fails, the error message includes the line and column where the issue was detected, so you can jump straight to the problem. For very large payloads, formatting a multi-megabyte file works but can take a moment — minifying is always fast.

Common Questions

Format adds indentation and line breaks so a one-line blob becomes readable. Minify does the opposite — strips whitespace to make the JSON as small as possible, useful for embedding in URLs, scripts or production payloads.

Escape turns your JSON into a single-line string with quotes and special characters escaped — ready to paste inside another string literal (e.g. a code variable or another JSON property). Unescape reverses that, turning an escaped string back into readable JSON.

Most often a trailing comma after the last item in an object or array, single quotes instead of double quotes, or unquoted keys. The error shows the exact line and column — start there.

Strict JSON doesn't allow comments. If you have JSONC (JSON with comments, used by VS Code's tsconfig.json), strip them first or the parser will reject the file.

No hard cap — limited only by your browser's memory. Multi-megabyte responses parse fine; very deeply-nested or extremely large arrays may slow the formatting step but won't crash.

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