JsonPlace MCP Docs

JsonPlace MCP Setup Guides and Mock API Recipes

JsonPlace MCP is a hosted remote MCP server for fake JSON generation, field discovery, public mock endpoints, and optional account-backed template and endpoint management. Connect to the hosted MCP URL in public mode first, then add your API key later if you need saved resources.

Hosted remote MCP URLhttps://jsonplace.com/mcp

Optional: sign in and get your API key

JsonPlace MCP works without login for public tools. Add an API key only if you want saved templates and endpoint management.

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Install Guide

How to connect JsonPlace MCP

Start in public mode, then add an API key only if you want account-backed tools.

1Add the hosted JsonPlace MCP server

Point your MCP client at https://jsonplace.com/mcp. Public mode works without any Authorization header.

2Use public mode first

You can immediately generate fake JSON, discover field options, create one-off public mock endpoints, and fetch public responses.

3Optional: unlock account features

Sign in on this page and add your JsonPlace API key only if you want saved templates, endpoint listings, updates, and deletes.

Client Setup

Choose your MCP client

Every client can connect to JsonPlace MCP without auth. API keys are only for saved templates and endpoint management.

Client	Config target	Works without API key
Codex	config.toml	Yes
Cursor	mcp.json	Yes
Claude Code	CLI user config	Yes
Opencode	opencode config	Yes

Codex

Install in Codex by pointing it at https://jsonplace.com/mcp. Public mode works without any auth header, and you can add your JsonPlace API key later for saved templates and endpoint management.

Read the full Codex guide

Cursor

Install in Cursor by pointing it at https://jsonplace.com/mcp. Public mode works without any auth header, and you can add your JsonPlace API key later for saved templates and endpoint management.

Read the full Cursor guide

Claude Code

Install in Claude Code by pointing it at https://jsonplace.com/mcp. Public mode works without any auth header, and you can add your JsonPlace API key later for saved templates and endpoint management.

Read the full Claude Code guide

Opencode

Install in Opencode by pointing it at https://jsonplace.com/mcp. Public mode works without any auth header, and you can add your JsonPlace API key later for saved templates and endpoint management.

Read the full Opencode guide

Agent Rules

Add JsonPlace MCP to AGENTS.md and project instructions

Installation makes the tools available. The rule below makes your agent choose them consistently.

Recommended rule

Always use JsonPlace MCP when I ask for fake JSON payloads, JSON field generation, template-backed mock APIs, static mock responses, or saved mock endpoint management.

Read the AGENTS.md guide

Recipes

Popular JsonPlace MCP workflows

Use these examples as a starting point for common JsonPlace MCP tasks.

How to create a JsonPlace health-check endpoint

Ask your connected agent to create a static JsonPlace endpoint at status/health with the response body {"status":"ok"}. JsonPlace MCP can create it and return the public URL in one step, even in public mode.

Open recipe

How to generate a company profile payload and save it as a template-backed endpoint

Ask your agent to generate a company profile payload with name, city, phone, and email, then save it as a template-backed JsonPlace endpoint. JsonPlace MCP can create the schema and the endpoint in one workflow.

Open recipe

How to create a saved static JSON mock endpoint with JsonPlace MCP

Ask your agent to create a static JsonPlace endpoint, provide the endpoint path, and provide the exact JSON body you want returned. JsonPlace MCP will save the endpoint and give you a public mock URL.

Open recipe

What JsonPlace MCP can do

Discover JsonPlace field options and search the field catalog.
Generate JSON payloads or infer fields from an example JSON object.
Create public static or template-backed mock endpoints without logging in.
List, create, and delete saved templates with an API key.
List, update, and delete saved mock endpoints with an API key.
Fetch the current payload behind a public mock endpoint.

Important notes

Hosted MCP URL: https://jsonplace.com/mcp
Full setup docs: https://jsonplace.com/docs/mcp
JsonPlace MCP works without an API key for public JSON generation and one-off public mock endpoints.
Add Authorization: Bearer <your JsonPlace API key> only when you want saved templates and endpoint management.
Anonymous-created endpoints are live public URLs, but anonymous clients cannot list, update, or delete them later.

FAQ

Common questions

Quick answers for the setup questions people ask most often.

What is JsonPlace MCP used for?

JsonPlace MCP helps coding agents generate fake JSON payloads, infer JSON field definitions, create template-backed mock APIs, create static mock responses, and optionally manage saved templates and mock endpoints.

How do I connect JsonPlace MCP?

Connect your client to https://jsonplace.com/mcp. Public mode works without auth, and you can add Authorization: Bearer <your JsonPlace API key> later for saved templates and endpoint management.

Which clients work with JsonPlace MCP?

JsonPlace MCP currently documents setup for Codex, Cursor, Claude Code, and Opencode, all using the same hosted MCP URL. Each client can start in public mode and optionally add an API key later.