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Freela

JSON validator

JSON validator. Format, encode or inspect developer snippets locally. Files and text stay on your device — Freela does not upload them.

Local only

Processed locally in your browser

JSONTEXT
  1. 1Run in the browser
  2. 2Download or copy
  • JSON

Supported formats: Input: text. Output: valid/invalid plus message.

  • JSON

How to use

  1. Paste the candidate string.
  2. Run Validate.
  3. Read the success state or the parser error.

Examples

  • Sanity-check a .json config before deploy.
  • See why a copy-pasted object failed in a console.

Questions

Does this tool upload my files?
No. Published Freela tools in this release are LOCAL_ONLY and run in the browser.
Is it free to use?
Yes. There is no paywall on this page and we do not invent reviews or star ratings.
What input does this page accept?
JSON validator: json validator. LOCAL_ONLY.
Do you validate against a schema?
No. This is syntax only. Schema validation would need a schema you provide and is a later tool.
Is a JSON number like 01 valid?
No. JSON does not allow leading zeros. The validator will fail.