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JSON Validator

Checks whether JSON parses and points at syntax failures. It is for quick validation before sending payloads to an API, config, or deployment step.

Processing

Runs in your browser. Input, settings, and results are not sent to Utilio servers.

How Utilio handles dataHow browser-local processing worksPrivacy Policy

JSON Validator

Local browser processing. Data stays on this device.

Looks valid

JSON OK

JSON was formatted: 5 -> 9 lines.

Keys
3
Objects
1
Arrays
1
Values
5

What to open next

Related tools and guides for the same job.

JSON to YAMLMove API examples into YAML documentation.JSON FormatterPretty-print a compact API response before reading it.URL EncoderEncode search queries, redirect parameters, and callback values.Base64 EncoderEncode sample strings for API tests or documentation.YAML to JSONConvert YAML config fragments into JSON for scripts.Base64 DecoderDecode a sample value from docs or logs.

What JSON Validator does

Use JSON Validator when you need to catch missing commas, trailing commas, and broken strings.

When to use it

  • Catch missing commas, trailing commas, and broken strings.
  • Validate pasted webhook bodies or config snippets.
  • Confirm a generated JSON example is safe to share as syntax-valid text.

How to use it

  1. Paste the JSON exactly as it will be used.
  2. Read the validation message and highlighted output.
  3. Fix syntax and run the check again.

What to check

  • A valid JSON document can still fail schema validation.
  • Large payloads with secrets should be validated locally in your own environment.

Data, formats, and limits

What stays on your device and what is sent

Runs in your browser. Input, settings, and results are not sent to Utilio servers.

Supported formats

This tool works with typed or generated values rather than uploaded files.

File limits and browser requirements

  • Use an up-to-date browser and check the result on the device where you will use it.

Known limits

  • This tool helps inspect or transform data, but it does not replace code review, security review, or production configuration checks.
  • Do not paste real secrets, tokens, or private keys into data you are not prepared to expose in the browser.

Troubleshooting

  • If validation fails, start with quotes, commas, brackets, whitespace, and input encoding.
  • If the result is unexpectedly empty, check the tool mode and a minimal example without extra fields.
  • Do not paste real tokens, passwords, or keys; use a test snippet with the same format for diagnosis.
All developer toolsPrivacy PolicyHow Utilio handles data

Common questions

What does Utilio receive?

Runs in your browser. Input, settings, and results are not sent to Utilio servers.

What is it useful for?

Use it when you need to catch missing commas, trailing commas, and broken strings. Start by pasting the JSON exactly as it will be used.

Do I need an account?

No. You can use this tool without creating an account.

Can I use it on a phone?

Yes. The tool works in a mobile browser, though longer input or detailed results may be easier to review on a larger screen.

How do I get a reliable result?

Paste the JSON exactly as it will be used. Then read the validation message and highlighted output. A valid JSON document can still fail schema validation.

Does Utilio use my input or results to train AI?

No. Utilio does not use files, pasted text, settings, generated values, or results from this tool to train AI models.