JSON Formatter & Validator
Validate, pretty-print and spot errors in JSON instantly, with the exact position of any syntax problem.
Formats in your browser — no server round-trip, no uploadHow to use
Paste your JSON into the input box and click Validate & Format. If the text is valid, it is re-indented with consistent two-space spacing and the cleaned result appears below, ready to copy. If the text is invalid, the tool reports the specific error and the character position where parsing stopped, so you can locate the missing comma, quote or brace. Large documents are handled in your browser with no upload, and the original keys and values are never altered — only the whitespace changes, which makes it safe to run on confidential payloads. You can also paste the contents of a saved file directly and reformat them before committing the change to version control, so the diff shows only the real edits rather than noisy whitespace churn.
Example
{ "name": "dev", "tools": 93 }FAQ
Does it change my data?
No. It only re-indents valid JSON; keys and values are preserved.
What if my JSON is invalid?
The error message points to the position so you can fix it quickly.
Why does my JSON fail to parse?
The most common causes are trailing commas, single quotes instead of double quotes, unquoted keys, and comments — none of which are valid JSON. The reported position points straight at the offending character.
Does it sort keys or change order?
No. Object key order is preserved exactly as written; this tool only adjusts indentation and line breaks.
Can it minify as well as pretty-print?
Yes. After formatting you can collapse the result back to a single line, which is handy for embedding JSON in a URL or a source file.
What is the difference between pretty and minified?
Pretty-printed JSON adds indentation and line breaks so a human can read it; minified JSON removes all whitespace to make the file as small as possible. The data is identical — only the spacing differs.
Can it handle deeply nested objects?
Yes. Arrays and objects can nest arbitrarily, and the formatter preserves the full structure while applying consistent indentation at every level so you can trace where each block opens and closes.
Why use two spaces rather than tabs?
Two spaces are the de facto default for JSON in most style guides and diff tools, which keeps changes easy to review. Tabs are also valid JSON whitespace, but two spaces avoid editor tab-width disagreements and keep diffs clean.