🧑‍💻 Developer

JSON Validator

Validate JSON and see the exact parse error if it is invalid.

Results

Result

📊 JSON Validator chart

Character composition of the result: letters, digits, spaces, punctuation and other symbols.

What is the JSON Validator?

Validate JSON and see the exact parse error if it is invalid. Everyday utilities for developers — encoders, formatters, hashes and generators — that run locally in your browser with standard Web APIs. No data is sent to any server.

JSON Validator – free online developer tool illustration
JSON Validator — free, exact and private.

How to use the JSON Validator

  1. Paste or type your your text into the box (a sample is pre-filled so you can see how it works).
  2. Results update automatically as you type; you can also press Calculate.
  3. Read the output: result.
  4. Use the 📊 chart to see the result visually, then copy or share it.

Tips for better results

  • Hashes use the Web Crypto API and match command-line tools such as sha256sum.
  • Never paste production secrets into any website — even client-side tools.
  • Use JSON Validator before JSON Formatter to see precise error positions.

Frequently asked questions

What does the JSON Validator do?

Validate JSON and see the exact parse error if it is invalid.

Is the JSON Validator accurate?

Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.

Is this tool free and private?

Yes — the JSON Validator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

Related tools

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