Errors

When an API request fails, the response includes an error object with a code and message.

Error Response Format

{
  "error": {
    "code": "ERROR_CODE",
    "message": "Human-readable description of the error"
  }
}

Some errors include additional details:

{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request body",
    "details": {
      "field": "input.document.base64",
      "reason": "Invalid base64 encoding"
    }
  }
}

HTTP Status Codes

Status	Meaning	Common Causes
400	Bad Request	Invalid JSON, missing required fields
401	Unauthorized	Missing or invalid API key
402	Payment Required	Insufficient credits
403	Forbidden	API key lacks required scope
404	Not Found	Flow or execution doesn’t exist
409	Conflict	Execution already cancelled
422	Unprocessable Entity	Valid JSON but invalid data
429	Too Many Requests	Rate limit exceeded
500	Internal Server Error	Server-side error
503	Service Unavailable	Maintenance or overload

Error Codes Reference

Authentication Errors

Code	Status	Description
`UNAUTHORIZED`	401	Missing or invalid authorization header
`INVALID_API_KEY`	401	API key is malformed or revoked
`FORBIDDEN`	403	API key missing required scope

Example:

{
  "error": {
    "code": "FORBIDDEN",
    "message": "API key missing required scope: flows:execute"
  }
}

Fix: Generate a new API key with the required scopes in the Dashboard.

Validation Errors

Code	Status	Description
`INVALID_INPUT`	400	Request body is invalid JSON
`VALIDATION_ERROR`	422	Request data fails validation
`MISSING_REQUIRED_FIELD`	422	Required field not provided
`INVALID_DOCUMENT`	422	Document data is corrupted or unsupported

Example:

{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid document format",
    "details": {
      "field": "input.document.mimeType",
      "reason": "Unsupported format: image/svg+xml",
      "supported": ["application/pdf", "image/png", "image/jpeg", "image/webp"]
    }
  }
}

Fix: Check the request body matches the expected schema. Ensure documents are in supported formats.

Resource Errors

Code	Status	Description
`FLOW_NOT_FOUND`	404	Flow ID doesn’t exist or isn’t accessible
`EXECUTION_NOT_FOUND`	404	Execution ID doesn’t exist
`VERSION_NOT_FOUND`	404	Requested flow version doesn’t exist

Example:

{
  "error": {
    "code": "FLOW_NOT_FOUND",
    "message": "Flow 'invoice-extractor' not found"
  }
}

Fix: Verify the flow ID is correct. Use GET /flows to list available flows.

Billing Errors

Code	Status	Description
`INSUFFICIENT_CREDITS`	402	Not enough credits for this operation
`SUBSCRIPTION_REQUIRED`	402	Feature requires paid subscription

Example:

{
  "error": {
    "code": "INSUFFICIENT_CREDITS",
    "message": "Insufficient credits. Required: 10, Available: 3"
  }
}

Fix: Purchase more credits or upgrade your plan in the Dashboard.

Execution Errors

Code	Status	Description
`EXECUTION_FAILED`	500	Flow execution failed
`EXECUTION_TIMEOUT`	504	Execution exceeded time limit
`ALREADY_CANCELLED`	409	Execution was already cancelled
`NOT_CANCELLABLE`	409	Execution already completed or failed

Example:

{
  "error": {
    "code": "ALREADY_CANCELLED",
    "message": "Execution exec_abc123 was already cancelled"
  }
}

Rate Limit Errors

Code	Status	Description
`RATE_LIMITED`	429	Too many requests
`CONCURRENT_LIMIT`	429	Too many concurrent executions

Example:

{
  "error": {
    "code": "RATE_LIMITED",
    "message": "Rate limit exceeded. Retry after 30 seconds"
  }
}

Fix: Implement exponential backoff. Check X-RateLimit-Reset header for when to retry.

Server Errors

Code	Status	Description
`INTERNAL_ERROR`	500	Unexpected server error
`SERVICE_UNAVAILABLE`	503	Service temporarily unavailable
`PROVIDER_ERROR`	502	Upstream provider (LLM/OCR) error

Example:

{
  "error": {
    "code": "PROVIDER_ERROR",
    "message": "OCR provider temporarily unavailable"
  }
}

Fix: Retry with exponential backoff. If persistent, check the status page.

Error Handling Best Practices

Retry Logic

Implement retries with exponential backoff for transient errors:

async function callAPI(request: Request, maxRetries = 3): Promise<Response> {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    const response = await fetch(request);

    if (response.ok) {
      return response;
    }

    const { error } = await response.json();

    // Don't retry client errors (except rate limits)
    if (response.status >= 400 && response.status < 500 && response.status !== 429) {
      throw new Error(error.message);
    }

    // Exponential backoff
    const delay = Math.pow(2, attempt) * 1000;
    await new Promise(resolve => setTimeout(resolve, delay));
  }

  throw new Error('Max retries exceeded');
}

Idempotency

Use idempotency keys to safely retry failed requests:

const response = await fetch('https://app.doclo.ai/api/v1/flows/invoice/run', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${apiKey}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    idempotencyKey: `invoice-${documentId}-${Date.now()}`,
    input: { document: { base64: documentData } }
  })
});

Error Logging

Log errors with context for debugging:

try {
  const result = await runFlow(flowId, input);
} catch (error) {
  console.error('Flow execution failed', {
    flowId,
    errorCode: error.code,
    errorMessage: error.message,
    requestId: error.requestId,
    timestamp: new Date().toISOString()
  });
}

Overview

Flows

Runs

Error Response Format

HTTP Status Codes

Error Codes Reference

Authentication Errors

Validation Errors

Resource Errors

Billing Errors

Execution Errors

Rate Limit Errors

Server Errors

Error Handling Best Practices

Retry Logic

Idempotency

Error Logging

Next Steps

Run Flow

SDK Client

Overview

Flows

Runs

​Error Response Format

​HTTP Status Codes

​Error Codes Reference

​Authentication Errors

​Validation Errors

​Resource Errors

​Billing Errors

​Execution Errors

​Rate Limit Errors

​Server Errors

​Error Handling Best Practices

​Retry Logic

​Idempotency

​Error Logging

​Next Steps

Run Flow

SDK Client

Error Response Format

HTTP Status Codes

Error Codes Reference

Authentication Errors

Validation Errors

Resource Errors

Billing Errors

Execution Errors

Rate Limit Errors

Server Errors

Error Handling Best Practices

Retry Logic

Idempotency

Error Logging

Next Steps