Key takeaways
- JSON Formatter validates your JSON and points out exactly where it's broken, instead of a cryptic parser error.
- Minified, single-line JSON from an API response gets reformatted into readable, indented structure.
- Useful for debugging API responses, config files, or anything copy-pasted that lost its formatting.
- Runs entirely in your browser — handy for JSON you'd rather not paste into a random website, like API responses with account data.
Formatting and validating
Paste your JSON into JSON Formatter — valid JSON gets reformatted and indented instantly; invalid JSON shows where the syntax breaks, usually a missing comma, an unescaped quote, or a trailing comma a stricter parser won't accept.
The usual suspects when JSON won't parse
- Trailing commas — valid in JavaScript objects, not valid in JSON.
- Single quotes instead of double quotes — JSON requires double quotes around keys and string values.
- Unescaped quotes inside a string — a stray `"` inside text breaks the structure unless it's escaped as `\"`.
Frequently asked questions
Can it convert JSON to CSV too?
For that, use [JSON to CSV](/json-to-csv) — this tool is focused on formatting and validating, not converting formats.
Is my JSON uploaded anywhere?
No — formatting and validation both happen in your browser.