Developer tool
JSON Validator
Paste JSON to check whether it parses, find syntax errors, and copy a beautified or minified version after it passes validation.
Validate JSON before you use it
Request bodies, webhook payloads, config snippets, and copied API responses often fail because of one small syntax issue. Paste the JSON to check it with the browser parser and see the error near the tool.
When the JSON is valid, you can beautify it for review or minify it for a compact payload. The data stays in your browser.
Practical examples
- Find a trailing comma before pasting JSON into an API client.
- Beautify a one-line JSON response so nested objects are easier to scan.
- Minify a valid configuration snippet after editing it.
Related JSON tools
Use the JSON Formatter for a combined formatting workflow, the JSON Viewer to inspect a tree, or the JSON Compare tool when two payloads need to be checked side by side.
FAQ
Is my JSON sent to a server?
No. Validation, formatting, and minifying run in your browser.
What errors can the validator show?
It reports JSON parser errors such as missing quotes, trailing commas, extra braces, and unfinished arrays.
Can it validate JSON schema rules?
No. This page checks JSON syntax, not a separate JSON Schema document.
Can I copy valid JSON after checking it?
Yes. Beautify or minify the JSON, then copy the result.
Does beautifying change the data?
No. It only changes whitespace and indentation after the JSON has been parsed.