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JSON Validator

Check JSON syntax and locate parsing errors.

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JSON Validator

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Up to 5 MB per input. Drop a file here to open it locally.

Processed on this device. No input is saved.

Is JSON Validator right for your task?

Check JSON syntax and locate parsing errors.

What to provide
Use the sample below to check the expected input syntax.
What you get
A syntax validation result. Valid JSON can still have missing fields or wrong value types; use JSON Schema Validator to check those rules.
Example input for JSON Validator

Illustrative input, not a record of a completed test. Check the selected mode before running it.

{"name":"Alice","active":true}

How to validate JSON and find syntax errors

Check JSON syntax and locate parsing errors.

  1. Paste your data into the input editor or select Open file, using the input format requested by this tool.
  2. Check your input and the supported features listed on this page before continuing.
  3. Select Run tool and inspect the output or any validation errors.
  4. Copy or download the result when it is ready. Review generated code or converted data before using it in another application.

Before you use the result

  • JSON uses double-quoted keys and strings. Trailing commas and comments are not valid JSON.
  • If syntax passes but an API rejects the data, compare it with that API’s schema.

If JSON Validator does not work as expected

Read the reported error location. Check quotes, delimiters and the selected mode; a file in another format needs the matching converter first. Repairs can change meaning, so review the differences.

Where your input is processed

The tool processes input in your browser. Loading the page and its processing libraries still needs network access. Site analytics and sharing services are separate from file processing; see the privacy explanation below. Privacy details.

Published by QoTool. About this site and its tool guides. Found an incorrect result? Report a problem with this tool with its settings and a non-sensitive example.

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Three steps, no uploads

Choose a tool, paste or open your data, then copy or download the result. File contents and verification keys are kept only in this page's memory.

Views show bounded previews for large documents; downloads contain the full processed output. Some conversions infer structure from samples and cannot preserve every format-specific feature.