JSON Formatter Online

Format messy JSON into readable output, validate payload structure, and inspect nested objects quickly in your browser.

How to use

  1. Paste raw or minified JSON into the input panel.
  2. Use Prettify to format the payload with stable indentation.
  3. Review the output, validate the structure, then copy or continue into a converter route.

Benefits

  • Makes nested API payloads readable for debugging and review.
  • Helps surface malformed commas, brackets, and quoting issues quickly.
  • Acts as the fastest starting point before generating code models.

Common uses

  • Inspect API responses during frontend and backend development.
  • Clean up payloads for documentation, tickets, and code review.
  • Validate JSON before sending it into TypeScript, Go, Java, or Kotlin generators.

Formatting tips

  • Start here before using converter pages when the source payload is hard to read.
  • Keep a small representative sample when generating models for stable type inference.
  • Use minify when you need compact transport-ready JSON after inspection.

Sample JSON

{"id":101,"name":"Ada Lovelace","active":true,"roles":["admin","editor"],"profile":{"email":"ada@example.com","score":9.8}}

Sample output

{
  "id": 101,
  "name": "Ada Lovelace",
  "active": true
}

FAQ

Can I validate invalid JSON with this formatter?

Yes. If the payload is malformed, the formatter helps expose syntax issues so you can correct them before reuse.

Should I format JSON before code generation?

Yes. Formatting first makes it easier to verify nested objects, optional fields, and array shapes before generating models.