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Decodes minified production stack traces back to original TypeScript source using source maps.
Decodes minified production stack traces back to original TypeScript source using source maps.
Valid MCP server (2 strong, 4 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
6 files analyzed Β· 1 issue found
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Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-vola-trebla-sourcemap-retrace-mcp": {
"args": [
"-y",
"sourcemap-retrace-mcp"
],
"command": "npx"
}
}
}From the project's GitHub README.
Your app crashed in production. The stack trace is useless. Your AI agent has no idea where the bug is.
MCP server that decodes minified production stack traces back to original TypeScript source files, lines, and columns β using source maps. Before your agent spends 20 minutes guessing at obfuscated code.
Your monitoring tool sends you this:
TypeError: Cannot read properties of undefined (reading 'userId')
at e.<anonymous> (main.a3f2c1.js:1:47821)
at h (vendor.d4e5f6.js:1:12045)
at processQueue (main.a3f2c1.js:1:89234)
You ask your agent to debug it. The agent reads main.a3f2c1.js. It's 40,000 characters of minified JavaScript. It has no idea what e.<anonymous> at column 47821 means.
sourcemap-retrace-mcp maps that back to:
at validateSession (src/auth/session.ts:142:8)
at handleRequest (src/api/middleware.ts:67:3)
Now the agent knows exactly where to look.
retrace_stackDecode a minified stack trace back to original TypeScript source locations. Pass the raw stack trace and the directory containing your .js.map files.
Retrace Results
Frames mapped: 3 | Unmapped: 1
TypeError: Cannot read properties of undefined (reading 'userId')
at validateSession (src/auth/session.ts:142:8)
at handleRequest (src/api/middleware.ts:67:3)
at processQueue (src/queue/processor.ts:28:12)
at Module._compile (node:internal/modules/cjs/loader:1376:14)
retrieve_code_contextShow the original source lines surrounding a mapped error location β with line numbers and a column pointer.
Code Context
File: src/auth/session.ts
Target: line 142, column 8
139 β const session = await getSession(token);
140 β if (!session) throw new AuthError("invalid token");
141 β
> 142 β return session.userId;
β ^
143 β }
144 β
145 β export async function refreshSession(token: string) {
audit_sourcemap_matchValidate that .map files in your dist directory are present and point to source files that actually exist on disk. Catches stale or missing maps before deployment.
Sourcemap Audit
Directory: dist/
Files checked: 4
OK: 3 | Missing maps: 0 | Broken sources: 1
β main.a3f2c1.js β 47 source(s) mapped
β vendor.d4e5f6.js β 312 source(s) mapped
β worker.b1c2d3.js β 8 source(s) mapped
β legacy.e7f8a9.js β 2 source(s) not found on disk:
../src/utils/deprecated.ts
../src/utils/compat.ts
{
"mcpServers": {
"sourcemap-retrace": {
"command": "npx",
"args": ["-y", "sourcemap-retrace-mcp"]
}
}
}
"I have a production error. Here's the stack trace: [paste]. My dist files are in /path/to/dist. Retrace it, show me the code around the error, and tell me what's wrong."
The agent runs retrace_stack, then retrieve_code_context on the mapped location, and can finally read the actual TypeScript that crashed.
Works great alongside:
MIT
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