Query JSON with dot and bracket paths

Extract a nested value from JSON with dot notation or bracket indexes.

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ToolJSON Path Query
Input
Output
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Preview

How it works

The query is tokenized into dot-separated names and numeric or quoted bracket segments, then each segment is followed through objects or arrays using own-property checks. The selected value is serialized as JSON and its type is reported.

  • The root marker $ selects the entire document.
  • Prototype names are blocked to prevent object-chain traversal.

Worked example

Nested Property
Extract a nested value using dot notation
Input
											{"user":{"name":"Alice","address":{"city":"Portland","zip":"97201"}}}
Output
												{
  "user": {
    "name": "Alice",
    "address": {
      "city": "Portland",
      "zip": "97201"
    }
  }
}

When to use this

API fixtures, package metadata, and webhook payloads use nested path extraction.

Edge cases

  • A missing property is reported as not found rather than returned as undefined.
  • A numeric bracket on an object is not converted into a string key.
  • __proto__, constructor, and prototype segments are blocked.