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feat(express): add jsonBodyLimit option to createMcpExpressApp #1559

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feat(express): add jsonBodyLimit option to createMcpExpressApp #1559

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11 changes: 9 additions & 2 deletions packages/middleware/express/src/express.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,13 @@ export interface CreateMcpExpressAppOptions {
* to restrict which hostnames are allowed.
*/
allowedHosts?: string[];

/**
* Controls the maximum request body size for the JSON body parser.
* Accepts a number (bytes) or a string (e.g., '1mb', '500kb').
* Defaults to Express's built-in default of '100kb' if not specified.
*/
jsonBodyLimit?: string | number;
}

/**
Expand All @@ -48,10 +55,10 @@ export interface CreateMcpExpressAppOptions {
* ```
*/
export function createMcpExpressApp(options: CreateMcpExpressAppOptions = {}): Express {
const { host = '127.0.0.1', allowedHosts } = options;
const { host = '127.0.0.1', allowedHosts, jsonBodyLimit } = options;

const app = express();
app.use(express.json());
app.use(express.json(jsonBodyLimit !== undefined ? { limit: jsonBodyLimit } : {}));

// If allowedHosts is explicitly provided, use that for validation
if (allowedHosts) {
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