JSON Formatter and Validator | Beautify JSON
Format, validate, minify, and debug JSON from API responses, config files, webhooks, logs, and copied payloads.
Paste Raw JSON
Result (Formatted)
What the JSON Formatter Checks
The JSON formatter validates syntax, highlights parse errors, beautifies nested objects, and can minify payloads for APIs, configuration files, webhooks, and copied response bodies.
Common JSON Problems It Helps Find
Use it to catch missing quotes, trailing commas, broken arrays, invalid escaping, wrong brackets, and deeply nested structures that are hard to inspect in one-line JSON.
When to Use JSON Formatting
Format JSON before debugging an API response, checking a webhook payload, editing a config file, documenting sample data, or sharing structured data with another developer.
About This Tool
JSON Formatter takes minified or unformatted JSON and outputs it with consistent indentation, line breaks, and syntax highlighting. It also validates the JSON structure and shows error messages when the input is malformed.
When to Use It
Use this when debugging an API response that arrives as a single compressed line, when reading a configuration file that has been minified, or when sharing JSON with a colleague in a readable form.
How to Use
- Paste your JSON string into the input area.
- Click Format to apply indentation and line breaks.
- Review any validation errors highlighted in the output.
- Copy the formatted JSON or switch to minified output.
Frequently Asked Questions
Can it detect JSON errors?
Yes. If the input is not valid JSON the tool highlights the position of the error and shows a message describing what is wrong.
Does it support JSON5 or JSONC (comments)?
The formatter handles standard JSON. JSON5 and JSONC with comments will show a parse error unless comments are removed first.
Can I minify JSON as well as format it?
Yes. A minify option removes all whitespace to produce the smallest possible JSON string, which is useful before sending data in a request.