Paste any JSON to instantly format it with clean indentation, minify it for production, or validate it with a precise line and column number for every error. Syntax-highlighted output, one-click copy and download, and everything runs locally in your browser.
Start formatting JSONFormatted or minified JSON will appear here.–
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This tool parses JSON entirely in your browser using the same engine your browser already ships with, so nothing you paste is uploaded or logged. It is built for developers debugging API responses, anyone cleaning up a minified config file, and students learning how JSON structure works. Format for readability, minify for production payloads, or validate to catch a syntax mistake before it breaks a build.
Pretty-print JSON with 2 spaces, 4 spaces, or tabs, and optionally sort object keys A to Z.
Strip all unnecessary whitespace to shrink JSON payloads for APIs, storage, or transport.
Invalid JSON is reported with the exact line and column number, not just a generic error.
Keys, strings, numbers, booleans, and null values are color-coded for fast visual scanning.
Parsing and formatting happen locally in your browser. Nothing you paste is uploaded.
Copy the result to your clipboard or download it as a ready-to-use .json file.
| Input | Action | Result |
|---|---|---|
{"name":"Ada","active":true} |
Format (2 spaces) | A pretty-printed object with each key on its own indented line. |
| A formatted, multi-line JSON file | Minify | {"name":"Ada","active":true} with no extra whitespace. |
{"name": "Ada",} |
Validate | Reports a trailing comma error at the exact line and column. |
{name: "Ada"} instead of {"name": "Ada"}.It checks whether a block of JSON is syntactically valid and rewrites it with consistent indentation so it is easier to read, debug, and review in code, API responses, or config files.
Yes, it is completely free with no sign-up. All parsing and formatting runs in your browser, so it keeps working even without a network connection once the page has loaded.
No. Formatting and validation happen entirely in client-side JavaScript using your browser's built-in JSON parser, so the content you paste is never sent to a server.
It means the JSON is not syntactically valid at that character position, often caused by a trailing comma, a missing quote, or a missing colon. This tool converts that position into a line and column number so you can find it quickly.
Formatting adds indentation and line breaks so JSON is easy for humans to read. Minifying removes all unnecessary whitespace to produce the smallest possible payload, which is useful for APIs and storage.
Yes. Enable the sort keys option before formatting to alphabetically order the keys of every object in the structure, which makes diffing two JSON payloads much easier.
There is no hard limit set by this tool, but very large payloads (several megabytes) depend on your browser's available memory and may take a moment longer to process.
No. This tool validates strict, standards-compliant JSON as defined by RFC 8259. Comments and trailing commas are not valid in standard JSON and will be reported as errors.