JSON pointer has

json-pointer-has · version 1.0.0 · JSON & JSONL · free, no key needed

Return whether an RFC 6901 pointer exists as an own path.

Use when you need to: json pointer has · has json pointer · json pointer exists.

Decide before calling

Read the versioned contract and the supported scope below. Reuse json-pointer-has@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use json-pointer-has@1.0.0 for json pointer has. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

json pointer has
has json pointer
json pointer exists

Not supported

prototype has
json patch

Behavior

Accept only JSON values: null, boolean, finite number, string, array, and plain objects.
Reject NaN, Infinity, -Infinity, undefined, BigInt, functions, symbols, Date, Map, Set, RegExp, boxed primitives, Buffer, and sparse holes.
Canonicalize -0 to 0.
Objects may have null or Object.prototype; use own enumerable string keys only.
Treat __proto__, constructor, and toString as ordinary own keys. Never mutate Object.prototype.
Output objects must be Object.create(null). Deep-clone all returned JSON values.
Bound walk: max depth 32, max nodes 10000, max UTF-8 JSON bytes 250KiB of the input document string if provided as text; when json is already a value, bound the walked node count and depth.
Same pointer grammar as json-pointer-get.
present is true only if every token resolves through own properties or valid in-range array indexes.
Invalid pointer syntax is invalid_input, not present false.
Missing keys and out-of-range indexes yield present false. "-" is not present.

Input

json (any JSON value, required)
pointer (string, required): max length 1024

Output

present (boolean, required)

Limits

max json depth: 32
max json nodes: 10000
max pointer chars: 1024

Example

Request input:

{
  "json": {
    "a": [
      1
    ]
  },
  "pointer": "/a/0"
}

Response:

{
  "result": {
    "present": true
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "json-pointer-has",
  "version": "1.0.0",
  "input": {
    "json": {
      "a": [
        1
      ]
    },
    "pointer": "/a/0"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/json-pointer-has/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"json":{"a":[1]},"pointer":"/a/0"}'

The machine-readable contract is at /v1/tools/json-pointer-has/versions/1.0.0.

CLI

node cli.mjs run json-pointer-has 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

JSON flatten: Flatten a JSON value into a null-prototype map keyed by RFC 6901 JSON Pointers.
JSON keyed array merge: Three-way merge JSON arrays by a JSON Pointer key, returning edits, moves, inserts, deletes, and conflicts.
JSON pointer get: Return the cloned JSON value at an RFC 6901 pointer.
JSON pointer list: List RFC 6901 pointers to every reachable JSON node, root first.
JSON schema additional find: Find every member a JSON Schema 2020-12 "additionalProperties": false forbids, with the member's JSON Pointer.
JSON schema batch validate: Validate many JSON records against one Draft 2020-12 subset schema; per-record validity, error pointers, counts.