JSON Contracts
Rank #63,201io.github.json-contracts/json-contracts
JSON contract registry and validator for structured LLM and agent outputs.
JSON Contracts is a Model Context Protocol (MCP) server published by json-contracts. It ranks #63,201 of 137,138 servers tracked on MCP Toplist, and its repository has 1 GitHub stars. JSON Contracts is listed across 3 registries — Official MCP, PulseMCP and Glama, with 1 tracked version. It was first listed on May 5, 2026 and most recently updated on May 5, 2026.
Ranks ahead of 73,937 of 137,138 servers on MCP Toplist.
Use JSON Contracts
No credentials or required configuration declared — add it to your MCP client and go.
claude mcp add json-contracts -e "JSON_CONTRACTS_DIR=<your JSON_CONTRACTS_DIR>" -- npx -y json-contractsReplace each placeholder with your own value before saving.
[mcp_servers.json-contracts]
command = "npx"
args = ["-y", "json-contracts"]
[mcp_servers.json-contracts.env]
JSON_CONTRACTS_DIR = "<your JSON_CONTRACTS_DIR>"Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.
{
"mcpServers": {
"json-contracts": {
"command": "npx",
"args": [
"-y",
"json-contracts"
],
"env": {
"JSON_CONTRACTS_DIR": "<your JSON_CONTRACTS_DIR>"
}
}
}
}Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.
{
"mcpServers": {
"json-contracts": {
"command": "npx",
"args": [
"-y",
"json-contracts"
],
"env": {
"JSON_CONTRACTS_DIR": "<your JSON_CONTRACTS_DIR>"
}
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.
{
"servers": {
"json-contracts": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"json-contracts"
],
"env": {
"JSON_CONTRACTS_DIR": "<your JSON_CONTRACTS_DIR>"
}
}
}
}Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.
{
"mcpServers": {
"json-contracts": {
"command": "npx",
"args": [
"-y",
"json-contracts"
],
"env": {
"JSON_CONTRACTS_DIR": "<your JSON_CONTRACTS_DIR>"
}
}
}
}Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.
{
"mcpServers": {
"json-contracts": {
"command": "npx",
"args": [
"-y",
"json-contracts"
],
"env": {
"JSON_CONTRACTS_DIR": "<your JSON_CONTRACTS_DIR>"
}
}
}
}Replace each placeholder with your own value before saving.
Show your rank
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[](https://mcptoplist.com/server/io.github.json-contracts%2Fjson-contracts)<a href="https://mcptoplist.com/server/io.github.json-contracts%2Fjson-contracts"><img src="https://mcptoplist.com/badge/io.github.json-contracts%2Fjson-contracts.svg" alt="MCP Toplist: Top 50% of 137,138" /></a>Variants: append ?metric=score or ?metric=stars to the image URL.
Listed on 3 registries
json-contracts
Available versions (1)
| Version | Published |
|---|---|
| 0.1.2 | May 5, 2026 |
Frequently asked questions
- Who maintains JSON Contracts?
- JSON Contracts is maintained by json-contracts, which publishes 1 MCP server (1 total version) tracked on MCP Toplist.
- Is JSON Contracts listed on the Official MCP Registry?
- Yes — JSON Contracts is listed on the Official MCP Registry, alongside PulseMCP and Glama.
- How many versions does JSON Contracts have?
- MCP Toplist tracks 1 version of JSON Contracts, most recently published on May 5, 2026.
- Where can I find the source code for JSON Contracts?
- The source code for JSON Contracts is hosted at github.com/json-contracts/json-contracts.
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