[//]: # "File generated from a template. Do not edit this file directly."

# node-execute-block-error-missing-item-index

In the operations in the `execute()` method in a node, `NodeApiError` and `NodeOperationError` must specify `itemIndex` as the third argument.

📋 This rule is part of the `plugin:n8n-nodes-base/nodes` config.

## Examples

❌ Example of **incorrect** code:

```js
class TestNode {
    async execute() {
        const items = this.getInputData();
        const returnData: INodeExecutionData[] = [];

        const resource = this.getNodeParameter('resource', 0) as string;
        const operation = this.getNodeParameter('operation', 0) as string;

        let responseData;

        for (let i = 0; i < items.length; i++) {

            try {

                if (resource === 'ticket') {

                    if (operation === 'create') {

                        responseData = await serviceApiRequest.call(this, 'POST', '/tickets', body);

                        throw new NodeOperationError(this.getNode(), "Error!");

                    }

                }

            } catch (error) {
                if (this.continueOnFail()) {
                    // ...
                }
            }
        }

        return [returnData];
    }
}

class TestNode {
    async execute() {
        const items = this.getInputData();
        const returnData: INodeExecutionData[] = [];

        const resource = this.getNodeParameter('resource', 0) as string;
        const operation = this.getNodeParameter('operation', 0) as string;

        let responseData;

        for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {

            try {

                if (resource === 'ticket') {

                    if (operation === 'create') {

                        responseData = await serviceApiRequest.call(this, 'POST', '/tickets', body);

                        throw new NodeOperationError(this.getNode(), "Error!");

                    }

                }

            } catch (error) {
                if (this.continueOnFail()) {
                    // ...
                }
            }
        }

        return [returnData];
    }
}

class TestNode {
    async execute() {
        const items = this.getInputData();
        const returnData: INodeExecutionData[] = [];

        const resource = this.getNodeParameter('resource', 0) as string;
        const operation = this.getNodeParameter('operation', 0) as string;

        let responseData;

        for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {

            try {

                if (resource === 'ticket') {

                    if (operation === 'create') {

                        responseData = await serviceApiRequest.call(this, 'POST', '/tickets', body);

                        throw new NodeOperationError(this.getNode(), "Error!", { test: 123 });

                    }

                }

            } catch (error) {
                if (this.continueOnFail()) {
                    // ...
                }
            }
        }

        return [returnData];
    }
}

class TestNode {
    async execute() {
        const items = this.getInputData();
        const returnData: INodeExecutionData[] = [];

        const resource = this.getNodeParameter('resource', 0) as string;
        const operation = this.getNodeParameter('operation', 0) as string;

        let responseData;

        for (let i = 0; i < items.length; i++) {

            try {

                if (resource === 'ticket') {

                    if (operation === 'create') {

                        responseData = await serviceApiRequest.call(this, 'POST', '/tickets', body);

                        throw new NodeOperationError(this.getNode(), "Error!", { test: 123 });

                    }

                }

            } catch (error) {
                if (this.continueOnFail()) {
                    // ...
                }
            }
        }

        return [returnData];
    }
}
```

✅ Example of **correct** code:

```js
class TestNode {
    async execute() {
        const items = this.getInputData();
        const returnData: INodeExecutionData[] = [];

        const resource = this.getNodeParameter('resource', 0) as string;
        const operation = this.getNodeParameter('operation', 0) as string;

        let responseData;

        for (let i = 0; i < items.length; i++) {

            try {

                if (resource === 'ticket') {

                    if (operation === 'create') {

                        responseData = await serviceApiRequest.call(this, 'POST', '/tickets', body);

                        throw new NodeOperationError(this.getNode(), "Error!", { itemIndex: i });

                    }

                }

            } catch (error) {
                if (this.continueOnFail()) {
                    // ...
                }
            }
        }

        return [returnData];
    }
}
```

## Links

- [Rule source](../../lib/rules/node-execute-block-error-missing-item-index.ts)
- [Test source](../../tests/node-execute-block-error-missing-item-index.test.ts)