Does this tool validate against a JSON Schema?

No—it checks syntax only. Use a schema validator if you need to enforce field types and required keys.

Developers

JSON Formatter

Format, minify, and validate JSON in your browser

Runs locally in your browser

Input

How it works

Validates, pretty-prints, and minifies JSON in your browser so you can read API responses, debug config files, and fix syntax errors without installing desktop tools.

Who it's for: Developers, DevOps engineers, and technical writers working with JSON configs, API payloads, and webhook bodies

Parses JSON and highlights syntax errors with a readable error message when the input is invalid.

Formats with indentation and line breaks for readability, or minifies to a single compact line for production.

Processes data locally—nothing is uploaded—so it is safe for staging configs and anonymized samples.

How to use

Paste raw JSON into the input field (objects, arrays, or nested structures).
Click Format to expand with indentation, or Minify to remove whitespace.
If parsing fails, read the error message, fix the syntax (missing quotes, trailing commas, etc.), and try again.
Use Copy to grab the formatted or minified output for your editor, ticket, or API client.
Keep a formatted copy alongside the minified version when sharing examples in documentation.

Good to know

Trailing commas are invalid in strict JSON but allowed in JSONC—strip comments and trailing commas before formatting.
Large payloads may slow the browser briefly; collapse sections in your editor if you only need a fragment.
Unicode and escape sequences are preserved exactly as entered.

FAQ

Does this tool validate against a JSON Schema?: No—it checks syntax only. Use a schema validator if you need to enforce field types and required keys.