JSON Patch builder

Open JSON Patch builder on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "json-patch-builder",
  "category": "developer-tools",
  "built": true,
  "requirements": "Up to 1,000,000 characters, 50,000 values and 64 nesting levels per document. UTF-8 file imports are limited to 1 MB. Processing runs in a local worker with a 10-second timeout and a bounded work budget. Duplicate keys and numbers that cannot be preserved safely are rejected.",
  "implementation": {
    "fields": [
      {
        "key": "change",
        "label": "Target JSON",
        "value": "{\n  \"profile\": {\"name\": \"Alex\", \"city\": \"Porto\"},\n  \"tags\": [\"new\"],\n  \"active\": true\n}",
        "type": "text"
      }
    ],
    "inputMaxLength": 1000000,
    "inputErrorCode": "PATCH_INPUT",
    "note": "Build and verify an RFC 6902 patch between two JSON documents. The builder emits add, remove and replace operations in deterministic order, replacing changed arrays in full. It does not promise a minimal patch or apply arbitrary move, copy or test operations. No API request is sent.",
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Original JSON document",
      "placeholder": "{\n  \"profile\": {\"name\": \"Alex\", \"city\": \"Lisbon\"},\n  \"tags\": [\"old\"]\n}",
      "help": "Paste the original JSON document. Use the second editor for the merge patch or target document. Up to 1,000,000 characters. Review the settings before running.",
      "helpParts": [
        "Paste the original JSON document. Use the second editor for the merge patch or target document.",
        "Up to 1,000,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": true
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": false,
    "name": null,
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

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