Fix clw-router-invalid: Router Configuration Schema Validation Failed

1. Symptoms

The clw-router-invalid error manifests during OpenClaw router initialization or when loading a route configuration file. You may encounter this error through several distinct indicators depending on when the validation occurs in your application’s lifecycle.

During Application Startup: When the router initializes at application boot, the validation failure produces output similar to the following:

[ClawRouter] ERROR: Router configuration validation failed
[ClawRouter] ERROR: clw-router-invalid - Schema validation error in route 'api/users'
[ClawRouter] DETAIL: Invalid field 'methods': expected array, received string
[ClawRouter] CONTEXT: Config file 'claw.routes.json' line 42, column 15

When Loading Routes Dynamically: If you load routes after startup using the dynamic route loading API, you might see:

ClawRouterLoadError: clw-router-invalid
  at Router.loadRoutes() in router-core.ts:284
  caused by: ValidationError - 'handler' field is required for route '/api/data'

Typical Shell Output Pattern: The error consistently appears with the clw-router-invalid code prefix, followed by a detailed message explaining which specific validation rule was violated. Additional context often includes the file path and line number where the invalid configuration was detected.

Visual Indicators:

Application fails to start with exit code 1
Router endpoints are not registered
In the OpenClaw dashboard, the router status shows “UNHEALTHY”
API requests return 500 Internal Server Error with no registered handlers

2. Root Cause

The clw-router-invalid error stems from the OpenClaw router’s strict schema validation system, which enforces specific structural requirements for all route definitions. This validation occurs during the configuration parsing phase before any routes are registered with the underlying HTTP server.

The OpenClaw router expects route definitions to conform to a JSON Schema specification that defines required fields, acceptable value types, and valid value ranges. When a configuration violates these constraints, the validation engine rejects the entire configuration with the clw-router-invalid code.

Primary Causes Include:

Missing Required Fields: Every route definition must include the path and handler properties. The path must be a non-empty string representing a valid URL pattern, while the handler must reference a valid function or middleware chain.

Type Mismatches: The methods field expects an array of HTTP method strings (GET, POST, PUT, DELETE, PATCH). Passing a single string like "GET" instead of ["GET"] triggers the validation error.

Invalid Path Patterns: Routes must use valid URL path syntax. Patterns containing consecutive slashes, illegal characters, or malformed parameter placeholders fail validation.

Schema Version Incompatibility: Configuration files created for a different OpenClaw version may use deprecated fields or missing mandatory additions. The schema validator rejects configurations that don’t match the current expected schema version.

Circular Dependencies: If a route’s handler references middleware that recursively depends on the route, the validation system detects the circular reference and flags it as invalid.

3. Step-by-Step Fix

To resolve the clw-router-invalid error, you must identify and correct the specific schema violation in your router configuration. Follow these steps systematically.

Step 1: Locate the Configuration File

The router configuration is typically stored in one of these locations:

./claw.routes.json in your project root
./config/routes.json
./src/router/routes.ts for TypeScript projects

Step 2: Enable Detailed Validation Output

Run your application with validation diagnostics enabled to get precise error locations:

Before:

node server.js

After:

CLAW_DEBUG=schema node server.js

This produces detailed validation output showing exactly which field is problematic.

Step 3: Correct the Schema Violation

Example 1: Fixing Method Type (Common Mistake)

Before:

{
  "path": "/api/users",
  "methods": "GET",
  "handler": "getUsers"
}

After:

{
  "path": "/api/users",
  "methods": ["GET"],
  "handler": "getUsers"
}

Example 2: Adding Missing Required Fields

Before:

{
  "path": "/api/data",
  "methods": ["POST"]
}

After:

{
  "path": "/api/data",
  "methods": ["POST"],
  "handler": "createData",
  "middleware": []
}

Example 3: Fixing Invalid Path Pattern

Before:

{
  "path": "/api//users",
  "handler": "getUsers"
}

After:

{
  "path": "/api/users",
  "handler": "getUsers"
}

Step 4: Validate Schema Version Compatibility

Ensure your configuration matches the current schema version:

Before:

{
  "version": "1.0",
  "routes": [...]
}

After:

{
  "version": "2.1",
  "routes": [...]
}

Step 5: Update OpenClaw if Necessary

If schema incompatibility persists, update OpenClaw to a compatible version:

npm update openclaw --save
# or
yarn upgrade openclaw

4. Verification

After applying the fix, verify that the router configuration loads successfully by following these verification steps.

Start the Application:

node server.js

Expected Output:

[ClawRouter] INFO: Router configuration loaded successfully
[ClawRouter] INFO: Registered 15 routes
[ClawRouter] INFO: Router status: HEALTHY

Test Route Registration: Use the OpenClaw CLI to verify all routes are properly registered:

claw router:status

Response should show:

Router Status: HEALTHY
Total Routes: 15
Registered Handlers: 15
Schema Validation: PASSED

Test API Endpoint Functionality: Make a test request to confirm routes are operational:

curl -X GET http://localhost:3000/api/users

A successful response (200 OK or appropriate status) confirms the fix resolved the configuration issue.

Automated Verification Script: Create a test script to validate router health during deployment:

const claw = require('openclaw');

async function verifyRouter() {
  try {
    const status = await claw.router.getStatus();
    if (status.healthy && status.schemaValid) {
      console.log('Router verification: PASSED');
      process.exit(0);
    } else {
      console.error('Router verification: FAILED');
      process.exit(1);
    }
  } catch (err) {
    console.error('Router verification: ERROR', err.message);
    process.exit(1);
  }
}

verifyRouter();

5. Common Pitfalls

Avoid these frequent mistakes that trigger or mask the clw-router-invalid error:

Pitfall 1: Mixing Configuration Formats Using JavaScript object notation for a JSON-only configuration file causes silent failures or validation errors. Ensure your configuration file is valid JSON by running it through a JSON validator before deployment.

Pitfall 2: Inconsistent Method Arrays Always use arrays for the methods field even for single-method routes. Some developers mistakenly use strings for single routes, but the schema requires arrays.

Pitfall 3: Ignoring Schema Version Drift Failing to update the schema version field when upgrading OpenClaw causes validation failures even if the content is structurally correct. Always update the version field to match your OpenClaw installation.

Pitfall 4: Hardcoded Path Values Avoid hardcoding absolute paths in route definitions. The router expects relative paths that can be prefixed with a base URL configuration.

Pitfall 5: Missing Handler References Every route must reference an existing handler function. Using a handler name that doesn’t exist in your handler registry triggers validation failure. Always ensure your handler registry includes all referenced handlers.

Pitfall 6: Environment-Specific Configuration Routes that work in development but fail in production often stem from environment-specific validation settings. Ensure your production environment has the same schema validation rules as development.

Pitfall 7: Template Literals in Paths Using template literals in route paths without proper escaping causes validation errors. Use static strings or properly escape dynamic segments.

The following errors share common origins with clw-router-invalid and may appear in similar contexts:

clw-router-missing

This error occurs when no router configuration file is found during initialization. Unlike clw-router-invalid, which indicates a present but invalid configuration, clw-router-missing means the configuration file doesn’t exist at all. It typically appears when the expected configuration path is incorrect or the file was accidentally deleted.

clw-route-not-found

When a request matches no defined route, OpenClaw throws clw-route-not-found. This differs from clw-router-invalid because it indicates a valid configuration exists, but the incoming request path doesn’t correspond to any registered route. This error often appears after a configuration change removes or renames a route.

clw-config-invalid

The clw-config-invalid error is a broader category that encompasses configuration problems beyond the router schema, including invalid middleware definitions, malformed security policies, and incorrect application settings. It may appear alongside or be a parent error for clw-router-invalid when multiple configuration sections fail validation.

Understanding the distinction between these errors helps pinpoint the exact location and nature of your configuration problems, enabling faster resolution and more targeted fixes.

1. Symptoms

2. Root Cause

3. Step-by-Step Fix

Step 1: Locate the Configuration File

Step 2: Enable Detailed Validation Output

Step 3: Correct the Schema Violation

Step 4: Validate Schema Version Compatibility

Step 5: Update OpenClaw if Necessary

4. Verification

5. Common Pitfalls

6. Related Errors

clw-router-missing

clw-route-not-found

clw-config-invalid