# How to Integrate Retool with Smartsheet

- Tool: Retool
- Difficulty: Intermediate
- Time required: 25 minutes
- Last updated: April 2026

## TL;DR

Connect Retool to Smartsheet by creating a REST API Resource with Smartsheet's API URL and access token Bearer authentication. Query sheets, read and write rows, and manage multi-sheet workspaces through Retool's query editor — building bulk data management tools that overcome Smartsheet's UI limitations for high-volume operational data updates.

## Build Smartsheet Operations Dashboards with Bulk Update Capabilities in Retool

Smartsheet is widely used in enterprises for project management, resource planning, and operational tracking. But Smartsheet's built-in UI has real limitations for high-volume data work — bulk updates are slow, cross-sheet reporting requires complex formulas, and there's no easy way for operations teams to perform batch edits based on external data sources. Retool solves these problems by providing a custom interface that reads and writes Smartsheet data through the API.

With Retool connected to Smartsheet, you can build panels that load hundreds of rows from a sheet, apply filters and sorts that Smartsheet's UI doesn't support efficiently, perform bulk updates based on rules (update all rows where Status is 'Pending' to 'In Progress'), and combine data from multiple sheets in a single view. Operations teams can manage Smartsheet data faster through Retool than through Smartsheet's own interface for bulk work.

Smartsheet's REST API represents rows as arrays of cells indexed by column ID — a format that requires a transformer to make readable. Once you understand this data structure and write the transformer once, all your Smartsheet queries become straightforward. The API supports full CRUD operations on sheets, rows, columns, and attachments.

## Before you start

- A Smartsheet account with access to the sheets you want to query
- A Smartsheet API access token (Account menu → Apps & Integrations → API Access → Generate new access token)
- The Sheet ID(s) of the Smartsheet sheets you want to query (visible in sheet properties or the URL)
- A Retool account with permission to create Resources
- Familiarity with Retool's Table component and JavaScript transformers

## Step-by-step guide

### 1. Create a Smartsheet REST API Resource in Retool

Navigate to the Resources tab in Retool and click Add Resource. Select REST API from the resource type list. Name the resource 'Smartsheet API'.

In the Base URL field, enter https://api.smartsheet.com/2.0. This is Smartsheet's API v2.0 base URL. All endpoint paths append to this base.

For authentication, select Bearer Token in the Authentication dropdown. Enter your Smartsheet access token in the Token field. For better security, store it as a configuration variable first: go to Settings → Configuration Variables, create SMARTSHEET_ACCESS_TOKEN, mark it as Secret, and paste your token. Then use {{ retoolContext.configVars.SMARTSHEET_ACCESS_TOKEN }} as the token value.

Smartsheet does not require additional headers beyond the Bearer token. Click Save Changes. Verify the resource by creating a test query to GET /sheets and confirming it returns your list of accessible sheets.

Note: Smartsheet access tokens do not expire (unless manually revoked), so this is a set-and-forget credential configuration. If you're building for a team, use a service account token rather than a personal token so it doesn't break when someone leaves the organization.

**Expected result:** The Smartsheet API resource is saved. A test GET to /sheets returns a list of sheet names and IDs confirming authentication is working correctly.

### 2. Fetch sheet data and understand Smartsheet's row format

Create a query to load sheet data. Name it getSheetData. Set Method to GET, Path to /sheets/{{ textInput_sheetId.value }}. Add URL parameters: key = includeAll, value = true (fetches all rows without pagination).

Smartsheet returns a sheet object with a columns array and a rows array. The critical thing to understand about Smartsheet's API is that rows don't use column names — they use column IDs. Each row has a cells array where each cell has a columnId and a value. You need the columns array to map columnId to column name.

Add a transformer that converts Smartsheet's format into readable objects. The transformer reads the columns array to build an ID-to-name map, then converts each row into an object with column names as keys:

This transformer makes the data usable in Retool Tables. Bind the transformer output to a Table component. Column names from Smartsheet become the Table's column headers automatically.

Drag a Text Input component onto the canvas for the sheet ID, with a default value set to your target sheet ID. Operators can change the sheet ID to switch between sheets.

```
// JavaScript transformer — convert Smartsheet rows to readable objects
const sheet = data;
const columns = sheet.columns || [];
const rows = sheet.rows || [];

// Build column ID to name mapping
const colMap = {};
columns.forEach(col => {
  colMap[col.id] = col.title;
});

// Convert each row to a named-key object
return rows.map(row => {
  const obj = {
    _row_id: row.id,
    _row_number: row.rowNumber,
    _created: row.createdAt
      ? new Date(row.createdAt).toLocaleDateString()
      : 'N/A',
    _modified: row.modifiedAt
      ? new Date(row.modifiedAt).toLocaleDateString()
      : 'N/A'
  };
  (row.cells || []).forEach(cell => {
    const colName = colMap[cell.columnId];
    if (colName) {
      obj[colName] = cell.displayValue !== undefined
        ? cell.displayValue
        : (cell.value !== undefined ? cell.value : '');
    }
  });
  return obj;
});
```

**Expected result:** The query returns sheet data transformed into an array of flat objects where Smartsheet column names are the object keys. The Retool Table displays the data with human-readable column headers.

### 3. Build row update and write-back queries

Create queries to write data back to Smartsheet. First, build a single-row update query named updateRow. The Smartsheet API expects row updates as an array of row objects, each containing the row ID and a cells array.

Important: To update a cell, you need the column's ID (not its name). The column IDs are in the sheet response from step 2. Store the column mapping and use it in update queries. A practical approach: store column IDs as Retool Variables when the sheet loads, making them available for write operations.

Set Method to PUT, Path to /sheets/{{ textInput_sheetId.value }}/rows.

For bulk updates on multiple selected rows in a Table, use table.changesetData (Retool's built-in change tracking for editable tables). Enable editing on the Table component, then build a Save Changes button that sends all modified cells to Smartsheet in a single PUT request with all changed rows in the array.

For bulk status updates on selected rows, use a separate button that constructs the rows array from table.selectedRows, setting a specific column to a fixed value for all of them.

```
// PUT /sheets/{id}/rows body — update status column for selected rows
// Assumes statusColumnId is stored in a Retool Variable
const selectedRows = table_sheet.selectedRows;
const STATUS_COLUMN_ID = parseInt(variable_statusColId.value);

const rowUpdates = selectedRows.map(row => ({
  id: row._row_id,
  cells: [
    {
      columnId: STATUS_COLUMN_ID,
      value: dropdown_newStatus.value
    }
  ]
}));

// This is the query body (set as JSON body in the PUT request)
return JSON.stringify(rowUpdates);
```

**Expected result:** The updateRow query successfully modifies Smartsheet rows. After running the query, getSheetData refreshes automatically (via an On Success event handler) and the Table shows the updated values.

### 4. Add new rows to a Smartsheet sheet

Create a query for adding new rows. Name it addRows. Set Method to POST, Path to /sheets/{{ textInput_sheetId.value }}/rows.

Adding rows uses the same cell format as updates — an array of row objects, each with a cells array of { columnId, value } objects. For a data entry form in Retool, build the row structure from form component values.

Add a Form component to your Retool app with text inputs, dropdowns, and date pickers matching your Smartsheet column structure. Name the form components to match the column names for clarity (e.g., form_status, form_assignee, form_due_date).

The addRows query body constructs the row object from form values. Since you need column IDs (not column names), either hardcode the column IDs from your sheet (stable values that don't change) or load them dynamically from the getSheetData response.

Add positioning control: include toBottom: true to append the new row at the bottom of the sheet, or toTop: true to add it at the top. Smartsheet also supports sibling rows for indented hierarchical sheets.

On the form's Submit button, trigger addRows. On addRows success, trigger getSheetData to refresh the table and clear the form fields using a JavaScript event handler.

```
// POST /sheets/{id}/rows body — add a new row from form values
// Column IDs are from your Smartsheet sheet's column definitions
// Find them from getSheetData.data.columns array
const columnIds = {
  task_name: 1234567890,    // replace with actual column IDs
  status: 1234567891,
  assignee: 1234567892,
  due_date: 1234567893,
  priority: 1234567894
};

// Build the new row object
const newRow = {
  toBottom: true,
  cells: [
    { columnId: columnIds.task_name, value: form_taskName.value },
    { columnId: columnIds.status, value: form_status.value },
    { columnId: columnIds.assignee, value: form_assignee.value },
    {
      columnId: columnIds.due_date,
      value: form_dueDate.value
        ? moment(form_dueDate.value).format('YYYY-MM-DD')
        : null
    },
    { columnId: columnIds.priority, value: form_priority.value }
  ]
};

return JSON.stringify([newRow]);  // API expects an array
```

**Expected result:** Submitting the form creates a new row in Smartsheet at the bottom of the sheet. The Table automatically refreshes to show the new row.

### 5. Build a cross-sheet data consolidation view

One of Retool's most powerful capabilities over native Smartsheet is easily combining data from multiple sheets in a single view. Create separate queries for each sheet you want to combine, all using the same Smartsheet API resource but with different sheet IDs.

For example, if you have separate project sheets for Q1, Q2, and Q3, create queries getQ1Sheet, getQ2Sheet, getQ3Sheet, each with the respective sheet ID hardcoded or selectable via a dropdown.

Create a JavaScript query named combineSheets that merges the data from all three sheet queries and adds a source column indicating which sheet each row came from:

For complex multi-sheet consolidations that require data from many Smartsheet sheets, transforming and joining data, and writing back to a master consolidation sheet, RapidDev's team can help architect the full Retool solution.

Bind the combineSheets output to a Table with a 'Source Sheet' column that's highlighted differently for each sheet using conditional formatting. Add sort and filter controls that work across all sheets simultaneously — something impossible in native Smartsheet without cross-sheet formulas.

```
// JavaScript query — combine rows from multiple Smartsheet sheets
// Runs after getQ1Sheet, getQ2Sheet, getQ3Sheet all complete
const transformRows = (sheetData, sheetName) => {
  const sheet = sheetData || { columns: [], rows: [] };
  const colMap = {};
  (sheet.columns || []).forEach(col => {
    colMap[col.id] = col.title;
  });
  return (sheet.rows || []).map(row => {
    const obj = { _source_sheet: sheetName, _row_id: row.id };
    (row.cells || []).forEach(cell => {
      const colName = colMap[cell.columnId];
      if (colName) obj[colName] = cell.displayValue ?? cell.value ?? '';
    });
    return obj;
  });
};

const q1Rows = transformRows(getQ1Sheet.data, 'Q1 Projects');
const q2Rows = transformRows(getQ2Sheet.data, 'Q2 Projects');
const q3Rows = transformRows(getQ3Sheet.data, 'Q3 Projects');

return [...q1Rows, ...q2Rows, ...q3Rows];
```

**Expected result:** The combined view shows rows from all three sheets in a single Retool Table with a Source Sheet column identifying the origin. Filters and sorts apply across all sheets simultaneously.

## Best practices

- Store your Smartsheet access token as a Secret configuration variable — never hardcode it in query fields or JavaScript code.
- Use a service account token for production Retool tools rather than a personal access token, so access doesn't break when team members change.
- Always write a transformer to convert Smartsheet's column-ID-indexed row format to named-key objects before binding to Retool Tables — this makes the data readable and the table columns automatically match Smartsheet's column names.
- Cache column ID mappings in Retool Variables when the sheet first loads, so write operations can reference them without re-parsing the sheet structure on every update.
- Use Smartsheet's batch row update endpoint (PUT /rows with an array) rather than making individual row updates — this reduces API calls and is much faster for bulk operations.
- For sheets over 5,000 rows, use Smartsheet's pagination parameters (rowsPerPage, pageNumber) rather than includeAll=true to avoid query timeouts.
- Add confirmation modals before bulk delete or bulk status change operations to prevent accidental data modification — Smartsheet doesn't have an undo for API-driven changes.
- Store frequently used sheet IDs and column IDs as Retool configuration variables rather than hardcoding them in queries, making it easy to target different sheets or update IDs when sheets are restructured.

## Use cases

### Build a bulk status update tool for project sheets

Create a Retool app that loads a Smartsheet project tracking sheet, allows filtering by assignee, due date, or status, and provides a bulk 'Update Status' action that changes multiple rows at once. Operations managers can select 50 rows and mark them all as 'Complete' in one action rather than updating them one by one in Smartsheet.

Prompt example:

```
Build a Smartsheet bulk editor that fetches all rows from a specified sheet ID, displays them in an editable Retool Table with filters for Status and Assigned To columns, and provides a 'Bulk Update Selected Rows' button that sends a batch row update to Smartsheet's /rows endpoint for all table.selectedRows.
```

### Cross-sheet resource allocation dashboard

Build a Retool dashboard that reads from multiple Smartsheet sheets (one per department) and combines them into a unified resource allocation view. Show each person's total allocated hours across all projects by joining data from different sheets using JavaScript queries.

Prompt example:

```
Create a resource allocation dashboard that reads rows from three Smartsheet sheets (engineering_sheet_id, design_sheet_id, marketing_sheet_id), uses a JavaScript transformer to aggregate allocated hours by employee name across all sheets, and displays a summary table showing total allocation vs. capacity per person.
```

### Smartsheet data sync tool with external database

Build an operations tool that compares data between a Smartsheet sheet and a PostgreSQL database, highlights discrepancies, and provides buttons to push changes in either direction. This is useful for cases where Smartsheet is used for planning but the database is the system of record.

Prompt example:

```
Build a data sync panel that queries both a Smartsheet sheet and a PostgreSQL orders table, uses a JavaScript transformer to identify rows that exist in one but not the other, and provides 'Push to Smartsheet' and 'Push to Database' action buttons for each discrepancy.
```

## Troubleshooting

### API returns 401 Unauthorized — 'You are not authorized to perform this action'

Cause: The access token is invalid, has been revoked, or belongs to a different Smartsheet account. Smartsheet tokens do not expire automatically but can be manually revoked.

Solution: Verify the token in Smartsheet → Account → Apps & Integrations → API Access. If the token listed doesn't match, generate a new one and update the SMARTSHEET_ACCESS_TOKEN configuration variable in Retool. Ensure the token belongs to an account that has access to the sheets you're trying to query.

### Sheet rows appear in the API response but the transformer returns empty objects

Cause: The transformer's column ID to name mapping failed, usually because the sheet data structure wasn't as expected. This can happen if the sheet has no columns, or if the response structure changed due to query parameters.

Solution: Add defensive checks in the transformer: verify that data.columns exists and is an array before building the colMap. Log the raw data.columns value to a Retool variable to inspect it. Ensure you're not including extra URL parameters that might change the response format.

```
// Safe version of the transformer with null checks
const sheet = data || {};
const columns = Array.isArray(sheet.columns) ? sheet.columns : [];
const rows = Array.isArray(sheet.rows) ? sheet.rows : [];
if (columns.length === 0) return [];
// ... rest of transformer
```

### Row update fails with 'Unknown column' or invalid column ID error

Cause: The column ID in your update query is incorrect or outdated. Column IDs are large integers — using a column name instead of ID, or a column ID from a different sheet, causes this error.

Solution: Run a fresh getSheetData query and inspect the data.columns array in Retool's Debug pane. Copy the exact column ID (as an integer, not a string) for the column you want to update. Column IDs in the cells array must be numbers — wrap them in parseInt() if they might be strings.

```
// Ensure column IDs are integers in cell objects
const cells = [
  {
    columnId: parseInt(retoolContext.configVars.STATUS_COLUMN_ID),
    value: dropdown_status.value
  }
];
```

### Large sheet takes too long to load and the query times out

Cause: Using includeAll=true on sheets with thousands of rows fetches all data at once, which can exceed Retool's default 10-second query timeout for large Smartsheet sheets.

Solution: Remove the includeAll parameter and use Smartsheet's native pagination instead: add URL parameters rowsPerPage=500 and pageNumber={{ Math.ceil((pagination.offset + 1) / 500) }}. Enable server-side pagination on your Retool Table. Alternatively, increase the query timeout in Advanced settings to 60 seconds for large sheets.

## Frequently asked questions

### Can Retool read data from Smartsheet Reports and not just Sheets?

Yes, Smartsheet Reports have their own API endpoint: GET /reports/{reportId}. Reports in Smartsheet aggregate data from multiple sheets, so querying a Report via Retool gives you a cross-sheet consolidated view. The response structure is similar to sheets with columns and rows, and the same transformer pattern applies.

### How do I find my Smartsheet Sheet ID?

In Smartsheet, open the sheet you want to query. Click File → Properties — the Sheet ID is shown there. Alternatively, the Sheet ID appears in the browser URL when you have the sheet open: app.smartsheet.com/sheets/SHEET_ID_HERE. Sheet IDs are 16-digit numbers. You can also retrieve all accessible sheet IDs via the Retool query: GET /sheets with no path parameters.

### Does Smartsheet have rate limits that will affect my Retool queries?

Smartsheet enforces rate limits at the account level: 300 requests per minute for free and standard plans, with higher limits on Enterprise plans. For Retool dashboards queried by a small team, this is rarely an issue. For automated workflows (Retool Workflows running on schedules), batch your operations to stay within limits and add delays between API calls using Workflow's Wait block.

### Can I attach files to Smartsheet rows from Retool?

Yes, Smartsheet's API supports file attachments via POST /sheets/{id}/rows/{rowId}/attachments with a multipart/form-data body. You can use Retool's File Input component to let users select a file, then build a query that uploads it as a row attachment. Note that binary file uploads require special handling in Retool — set the body type to binary and use the file input's value.

### How do I handle Smartsheet's hierarchical row structure in Retool?

Smartsheet supports indented rows (parent/child hierarchy) for project plans. The API returns rows with a parentId field indicating the parent row. In your transformer, you can preserve the hierarchy by adding an indentLevel field based on the row's indent value from the API response. Retool's Table doesn't natively support tree views, but you can filter parent rows separately and show a flat view grouped by parent row category.

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Source: https://www.rapidevelopers.com/retool-integrations/smartsheet
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