# @jsonfabrica/mcp-server

Generate realistic, relational synthetic JSON test data from templates, via the JsonFabrica API.

- **Type:** MCP server
- **Trust:** 40/100 (C), scored on the package rubric
- **Verification:** community-indexed — nobody has claimed this listing
- **Version:** 0.3.0
- **Author:** io.github.ms-methos
- **License:** MIT
- **npm:** @jsonfabrica/mcp-server
- **Source:** https://github.com/ms-methos/jsonfabrica-mcp-server
- **Compatible clients:** claude-code, cursor, copilot, gemini (basis: transport)

## Trust

40/100 (C), scored on the package rubric
- Publisher verified: no
- Install scripts: suspicious script found
- Prompt-injection scan: not run
- Obfuscation scan: not run
- Evidence age: 16 days

## Security scan

- **Status:** warnings
- **Scanned:** 2026-09-07T11:31:06.238Z
- **Version scanned:** 0.2.0
- **CVEs:** none found by OSV at scan time
**Changes since the previous scan:** tool-changed

## Tools

20 declared. Statically extracted from the shipped source — a floor on the surface, not a census.
- `jsonfabrica_whoami` — Calls GET /v1/whoami on the JsonFabrica gateway using the configured API key.
- `jsonfabrica_create_batch` — Calls POST /v1/batches. Generates multiple documents from one or more persisted templates in one
- `jsonfabrica_get_batch` — Calls GET /v1/batches/{batchId}. Returns batch status and, once complete, the generated
- `jsonfabrica_list_function_weights`
- `jsonfabrica_update_function_weight`
- `jsonfabrica_health` — Calls GET /health on the JsonFabrica gateway. No authentication required.
- `jsonfabrica_create_sequence` — Calls POST /v1/sequences. Creates a durable named sequence (number/string/uuid),
- `jsonfabrica_list_sequences` — Calls GET /v1/sequences. Returns a page of sequences (`{ items, nextCursor }`). Use this to
- `jsonfabrica_get_sequence` — Calls GET /v1/sequences/{name}. Returns the sequence record for a known `name`; use
- `jsonfabrica_update_sequence` — Calls PATCH /v1/sequences/{name}. Only the provided fields (currentValue, step) are changed; fields
- `jsonfabrica_delete_sequence` — Calls DELETE /v1/sequences/{name}. This is a hard, permanent delete — unlike
- `jsonfabrica_bump_sequence` — Calls POST /v1/sequences/{name}/bump. Atomically advances the sequence by its configured `step`
- `jsonfabrica_create_template` — Calls POST /v1/templates. Creates a persisted, reusable template that can be generated from
- `jsonfabrica_list_templates` — Calls GET /v1/templates. Returns a page of templates matching optional `name`/`tags`/`status`
- `jsonfabrica_get_template` — Calls GET /v1/templates/{templateId}. Returns the full template record for a known id. Use this
- `jsonfabrica_update_template` — Calls PUT /v1/templates/{templateId}. Partially updates an existing template in place: only the
- `jsonfabrica_delete_template` — Calls DELETE /v1/templates/{templateId}. This is a soft delete: the template's `status` is set to
- `jsonfabrica_generate_from_template` — Calls POST /v1/templates/{templateId}/generate. Generates a document from a persisted, saved
- `jsonfabrica_generate_adhoc` — Calls POST /v1/templates/generate. Generates a document directly from a raw `body` string
- `jsonfabrica_get_usage` — Calls GET /v1/usage. Returns `{ tenantId, usageTotal, asOf }` for the configured API key.

## Install

**Verdict: review** — Installable, but 2 things to check first: 1 suspicious change since the previous scanned version.
**Cautions** (coverage gaps and advisories — never blocking)
- 1 suspicious change since the previous scanned version. — Tool definitions changed in place since v0.1.4: jsonfabrica_create_batch [description], jsonfabrica_list_sequences [description], jsonfabrica_get_sequence [description], jsonfabrica_update_sequence [description], jsonfabrica_delete_sequence (privileged) [description], jsonfabrica_bump_sequence [description], jsonfabrica_create_template [description], jsonfabrica_list_templates [description], jsonfabrica_get_template [description], jsonfabrica_update_template [description], jsonfabrica_delete_template (privileged) [description], jsonfabrica_generate_from_template [description] — the tool list is unchanged, so review the new text before updating
- No publisher has proved control of this listing; it is indexed, not vouched for.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"mcp-server\": {\n      \"command\": \"npx\",\n      \"args\": [\n        \"-y\",\n        \"@jsonfabrica/mcp-server\"\n      ],\n      \"env\": {\n        \"JSONFABRICA_API_KEY\": \"<YOUR_JSONFABRICA_API_KEY>\"\n      }\n    }\n  }\n}"
```
**Credentials it will ask for** (names only — Forge never holds a value):
- `JSONFABRICA_API_KEY` — Jsonfabrica API Key (required)
Placeholders only. Forge never holds, brokers, or transmits a credential value — replace each <YOUR_NAME> in your own config file. Do not send a value back to Forge; no Forge endpoint accepts one.
- This entry needs 1 credential (1 required). The generated config carries placeholders, so it will fail in the editor rather than at runtime if they are left unset.

## Blast radius

Extensive blast radius — deletes data; holds an api key.
- Floor 53, ceiling 53 (tier: extensive)
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/%40jsonfabrica%2Fmcp-server
- Install plan: https://forgeregistry.com/api/v1/packages/%40jsonfabrica%2Fmcp-server/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/%40jsonfabrica%2Fmcp-server
- HTML page: https://forgeregistry.com/registry/%40jsonfabrica%2Fmcp-server
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.