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If the Context7 MCP server will not start, first check that Node.js is version 20 or newer, update the package to @upstash/context7-mcp@latest, and test whether https://mcp.context7.com/ping is reachable. Then match the fix to the error: use bunx or Deno if npx cannot resolve the package, apply the documented Node.js flag only for the specific ESM or TLS error it addresses, and check authentication separately from connectivity. If local stdio setup keeps failing and your client supports HTTP MCP, connect to Context7’s hosted endpoint instead.
Start with a known-good configuration
Context7 can run locally as an MCP server over stdio, or a compatible client can connect to its hosted MCP endpoint over HTTP. Start by confirming which setup you are using: a local configuration launches Node.js and the package on your computer; a remote configuration connects to https://mcp.context7.com/mcp and avoids local Node.js and npx setup. The exact fields for remote transport vary by client, so use the client-specific format in Context7’s all-clients guide.
Local stdio baseline
For a local setup, use this as a baseline in the MCP configuration file for your client:
{
"mcpServers": {
"context7": {
"command": "npx",
"args": ["-y", "@upstash/context7-mcp@latest", "--api-key", "YOUR_API_KEY"]
}
}
}The API key is optional for basic access, but is recommended if you run into rate limits. If you do not have a key and are not seeing rate-limit errors, you can omit "--api-key", "YOUR_API_KEY" from args. Use the current package tag rather than an old pinned release unless you are diagnosing a specific version-dependent error.
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Remote HTTP baseline
If your MCP client supports remote HTTP servers, configure it to connect to https://mcp.context7.com/mcp. When authentication is required, send the API key in an Authorization: Bearer YOUR_API_KEY header. Follow the transport configuration shown for your specific client in the official client instructions; a local stdio JSON configuration is not interchangeable with an HTTP server definition.
Check Node.js and package resolution
Run this in a terminal:
node --versionContext7’s troubleshooting guide specifies Node.js v20 or newer. If the version is older, install or select a supported Node.js release, then restart the terminal and MCP client so they inherit the updated runtime. If the client still launches an older Node binary, check which executable is on the client’s PATH rather than relying only on the version shown in a different shell.
Make sure the package reference is current: @upstash/context7-mcp@latest. A stale or incomplete package reference can cause startup or resolution failures. If the log contains ERR_MODULE_NOT_FOUND while using npx, try an alternate package runner:
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bunx -y @upstash/context7-mcpThe troubleshooting guide also documents Deno as an alternative when npx cannot resolve the package. Use the invocation documented there, since Deno’s command syntax and permissions differ from npm-style runners. These alternatives address package resolution; they do not fix an unreachable server, invalid credentials, or client configuration errors.
Use Node.js flags only for the matching error
Do not add experimental Node.js options as a general startup fix. Context7 documents separate workarounds for two distinct failures:
Cannot find module 'uriTemplate.js'
For this specific ESM-related error, the documented configuration is:
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{
"command": "npx",
"args": ["-y", "--node-options=--experimental-vm-modules", "@upstash/[email protected]"]
}This workaround names version 1.0.6; it is not the general recommended package tag for every setup. Apply it when the log matches the documented uriTemplate.js error, and remove it if it is not relevant to the failure you are diagnosing.
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TLS or certificate errors
If startup fails with a TLS or certificate error, Context7 documents trying this configuration:
{
"command": "npx",
"args": ["-y", "--node-options=--experimental-fetch", "@upstash/context7-mcp"]
}This is a targeted troubleshooting option, not a substitute for checking a corporate proxy, certificate policy, or network access. The package reference shown here follows the documented workaround; use the current package version for ordinary setup.
Separate network reachability from authentication
Test the hosted service’s ping endpoint from the same machine or environment where the MCP client runs:
curl https://mcp.context7.com/pingThe documented healthy response is {"status":"ok","message":"pong"}. This checks that the endpoint can be reached; it does not validate an API key or prove that the MCP client’s transport configuration is correct.
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- Check that the machine has network access to
mcp.context7.com. - If your organization requires a proxy, configure both
https_proxyandHTTPS_PROXYin the environment used by the MCP process, or add the equivalent environment entries to the MCP server configuration. - Repeat the ping from that environment. Restart the client after changing proxy settings.
- If the request still fails, inspect the client or server logs for the specific connection, DNS, TLS, or timeout error rather than treating it as an authentication failure.
If the ping works but MCP returns 401
A successful ping establishes reachability, not authorization. For HTTP transport, use an Authorization: Bearer YOUR_API_KEY header; for local stdio, pass the key with --api-key YOUR_API_KEY. Context7’s troubleshooting guide says a valid key starts with ctx7sk. Check for an omitted, malformed, or misplaced key, and follow the Context7 API guide for authentication details.
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If the error is a rate limit
A rate limit is different from an unreachable service or a 401 caused by invalid authentication. Obtain an API key from the Context7 dashboard and supply it in the right place for your transport. Context7’s API guide covers authentication and rate-limit handling. Do not put an HTTP Bearer header into a stdio argument list; use the transport-appropriate method above.
Check the MCP client’s configuration and logs
An otherwise valid server entry will not start if it is saved in a file the client does not read, uses the wrong transport format, or has invalid JSON. After changing settings, restart the client so it reloads the configuration. Verify the global or project-level file and follow the relevant client instructions in Context7’s all-clients guide.
- Cursor: the guide identifies either
~/.cursor/mcp.jsonor a project-level.cursor/mcp.json. Check which scope contains your server entry. - VS Code: the guide calls for current MCP support and the Copilot extension. Check the client’s available MCP support and its logs if the configuration is not being loaded.
- Claude Code: use
claude mcp listto inspect configured servers andclaude mcp logs context7to review the Context7 server logs. - Codex: follow the Codex-specific setup in the official all-clients guide. It includes a
startup_timeout_mssetting, which may matter if the client stops waiting before server startup completes.
Client-specific file locations and settings can change. When a server does not appear in the client’s MCP list, first confirm that the entry is in the correct configuration file and that the file parses; then inspect the host client’s logs for launch details.
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| Option | When it fits | Trade-off |
|---|---|---|
Local stdio with npx |
Your client supports stdio and you want the server process launched locally. | Depends on the local Node.js runtime, package resolution, and correct client configuration. |
Local stdio with bunx or Deno |
npx cannot resolve or launch the package and you can use an alternate runner. |
Changes the local runtime path; it does not bypass network or authentication problems. |
Remote HTTPS at https://mcp.context7.com/mcp |
Your client supports remote HTTP MCP and local Node.js or npx setup is the obstacle. |
Requires network access to the hosted endpoint and the HTTP configuration format supported by your client. |
Context7’s troubleshooting guide describes the remote connection as a way to skip local Node.js issues. Choose it when the host client supports remote MCP and your network permits the connection; keep local stdio when you specifically need a locally launched process or your client cannot use the remote transport.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Collect useful diagnostics before escalating
Enable diagnostic logging with DEBUG=* in the server process environment, then reproduce the failure. For an isolated protocol-level check, Context7 documents running the server through MCP Inspector:
npx -y @modelcontextprotocol/inspector npx @upstash/context7-mcpWhen asking for help, include the operating system and version, Node.js version, MCP client and version, sanitized configuration, exact error text, and relevant logs. Remove API keys, cookies, and other secrets before sharing configuration or logs. The official troubleshooting checklist is at Context7’s troubleshooting guide.
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Context7’s MCP server is for documentation lookup; it is not a website screenshot service. If the separate task is capturing a web page image or PDF from code or an AI agent, ScreenshotNeo is a website screenshot API and MCP server. Its API takes a URL in one GET request; it is not a remedy for a Context7 startup failure.
For example, this cURL request saves a WebP screenshot of Stripe. Get an API key and see the ScreenshotNeo API documentation for the complete options:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; those steps can each be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000.
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Frequently Asked Questions
Does Context7 require an API key to start?
No. The key is optional for basic access; add one when you encounter rate limits or when the requested connection requires authentication.
Can I configure local stdio and remote HTTP in the same way?
No. Stdio launches a local process, while remote HTTP connects to a hosted endpoint. Use the configuration format for your MCP client and chosen transport.
Where should I send a Context7 startup report?
Use Context7’s official support or project channels linked from its documentation, and include sanitized logs and configuration rather than credentials.
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