Unformatted JSON is tough to read, especially when you're debugging API responses or reviewing config files. A JSON beautifier takes minified or single-line JSON and reformats it with proper indentation, making the structure immediately visible. This tool parses your input client-side and outputs clean, indented JSON — no data leaves your browser.

Paste in a raw API response, a stringified JSON blob from your logs, or a minified config file, and you'll get a neatly indented version you can actually read. This is particularly useful when you're working with deeply nested objects or arrays where the hierarchy matters — like Terraform state files, OpenAPI specs, or GraphQL introspection results.

Unlike server-based formatters, everything here runs in your browser using JSON.parse() and JSON.stringify(). Your data never hits a server, which matters when you're working with production payloads, tokens, or anything you wouldn't paste into a random website. If you're preparing JSON as a prompt or context payload for an LLM API, use our AI token counter to estimate how many tokens your formatted JSON will consume and what the API call will cost across GPT-4o, Claude, and Gemini.

Tips

Use Cmd+Enter (or Ctrl+Enter) to format instantly without clicking the button.
If formatting fails, check for trailing commas or unquoted keys — common issues when copying from JavaScript objects.
Need compact JSON instead? Most formatters can minify too — just set indentation to 0 spaces.
Pipe curl output through jq . locally, or paste it here when you need a quick visual check.