Crypto

JSON Validator

Validate, format, and minify JSON. Error location. 100% client-side.

100% client-side — data never leaves browser.

How to use

  1. Enter a domain, URL, or value relevant to JSON Validator.
  2. Run the check and review the output carefully.
  3. Apply recommended fixes, then run the check again to verify.

Common use cases

  • Pre-deployment validation for JSON Validator.
  • Incident triage when security checks fail in production.
  • Periodic security review as part of technical SEO and hardening.

Example inputs

{"key": "value"}[1, 2, 3]

Common issues and fixes

Trailing comma

JSON does not allow trailing commas. Remove comma before ] or }.

Unquoted keys

Object keys must be in double quotes. Single quotes are invalid.

Unexpected token

Usually unescaped control char, wrong number format, or undefined. Check line/position.

Recommended remediation

Remove trailing commas. Use double quotes for keys and strings. Escape \ " \n. Validate before minifying.

FAQ

Is JSON Validator free to use?

Yes. This tool is free and can be used without account registration.

Do you store submitted values?

Only the minimum processing needed for the check. For client-side tools, data stays in your browser.

How should I use these results?

Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.

Related security tools

Base64 Encoder / Decoder

Encode and decode text to and from Base64 format. Fully client-side — your data never leaves the browser.

Hash Generator

Generate MD5, SHA-256, and SHA-512 cryptographic hashes from any text input. 100% client-side.

JSON Minifier

Minify JSON — remove whitespace. Validate and compress. 100% client-side.