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JSON Validator

Check JSON syntax and locate formatting errors locally.

Local processingYour input stays hereSimple controls

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Input JSON
0 characters · 0 bytes
Output JSON
Your result will appear here.

Up to 1,000,000 input characters (1 MB uploads) and 100 nesting levels. Ctrl/⌘ + Enter processes your input. Large previews are truncated; downloads contain the full result.

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Processed locally in your browser

Your input does not need to be uploaded to an EvryNest server. Nothing is saved automatically.

How It Works

  1. 1
    Provide JSON

    Paste JSON or select a local file.

  2. 2
    Check syntax

    Validate the structure and review any line or column error.

  3. 3
    Correct and validate

    Fix errors, then format or minify the valid result.

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Frequently Asked Questions

How does JSON Validator work?

Validation checks JSON syntax, not a custom schema. Errors identify the parser location where available.

Does this tool upload or save my input?

Core processing happens locally in this browser tab. Input and output are not sent to a processing server or stored automatically. Copy and download only occur when you request them.

What happens with large or invalid inputs?

Input limits and errors are shown in the workspace. JSON supports up to 1 MB and 100 nesting levels; large previews can be truncated while downloads retain the full result.