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How to Integrate Toggl with V0

To integrate Toggl Track with V0 by Vercel, generate a time tracking dashboard UI with V0, create Next.js API routes that call the Toggl Track API v9 using HTTP Basic Auth with your API token, and store the token in Vercel environment variables. Your app can display time entries, project summaries, and client reports without exposing your Toggl credentials to the browser.

What you'll learn

  • How to generate a time tracking dashboard or report UI with V0
  • How to authenticate Toggl API requests using HTTP Basic Auth with your API token
  • How to create Next.js API routes that fetch Toggl time entries and projects
  • How to build aggregated time reports for projects and clients
  • How to store the Toggl API token securely in Vercel environment variables
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Intermediate15 min read25 minutesOtherApril 2026RapidDev Engineering Team
TL;DR

To integrate Toggl Track with V0 by Vercel, generate a time tracking dashboard UI with V0, create Next.js API routes that call the Toggl Track API v9 using HTTP Basic Auth with your API token, and store the token in Vercel environment variables. Your app can display time entries, project summaries, and client reports without exposing your Toggl credentials to the browser.

Build Custom Time Tracking Dashboards for Toggl Track with V0 and Next.js

Toggl Track is one of the most popular time tracking tools for freelancers and small agencies — its one-click timer, automatic idle detection, and clean mobile apps make it easy to capture billable hours accurately. However, the native Toggl reporting interface has limitations: fixed report templates, limited filtering options, and no way to combine Toggl data with other business data like invoicing or project management. Building a custom Toggl dashboard with V0 solves these limitations.

The Toggl API v9 is well-documented and uses simple HTTP Basic Authentication with your personal API token as the username and 'api_token' as the password — no OAuth dance required. The API covers time entries, projects, clients, workspaces, tags, and workspace members. For reporting, the separate Toggl Reports API provides pre-aggregated summary and detailed reports that are more efficient to fetch than computing aggregations from raw time entries.

For V0-generated apps, Toggl integration is most valuable for freelancers who want a custom invoice-ready time summary, agencies building client-facing portals showing hours worked by project, and product teams tracking time by feature to measure engineering investment. V0's ability to generate sophisticated dashboard layouts with Recharts visualizations makes it well-suited for building the kind of time analytics that Toggl's native interface does not provide — custom date ranges, multi-project comparisons, client billing summaries, and productivity trend analysis.

Integration method

Next.js API Route

Toggl Track integrates with V0-generated Next.js apps through server-side API routes that call the Toggl API v9 using HTTP Basic Authentication. Your Toggl API token is stored as a server-only Vercel environment variable and never exposed to the browser. The time tracking dashboard and reporting components V0 generates fetch time entry and project data through your Next.js API routes. Reports can be generated by combining the Toggl Track API for raw data with the separate Toggl Reports API for pre-aggregated summaries.

Prerequisites

  • A Toggl Track account at toggl.com/track — free plan includes 5 projects and full API access
  • Your Toggl API token — found in Toggl Dashboard → Profile Settings → scroll to the bottom, 'API Token' section
  • Your Toggl Workspace ID — visible in Toggl Dashboard → Settings → Workspaces, or in the URL when viewing workspace settings
  • At least a few time entries tracked in Toggl so you have data to display in your V0 dashboard
  • A V0 account at v0.dev and a Vercel account for deploying your Next.js app

Step-by-step guide

1

Generate the Time Tracking UI with V0

Open V0 at v0.dev and describe the time tracking dashboard or report interface you want to build. Time tracking data lends itself well to visual displays — bar charts for daily hours, donut charts for project time distribution, tables for detailed entry lists, and KPI cards for weekly totals. Include these specific visualization requests in your V0 prompt and specify that you want Recharts components since V0 generates clean Recharts integration code. For a time report dashboard, describe the date filtering controls (date range picker or preset buttons like 'This Week', 'This Month'), the project filter dropdown if users should be able to focus on specific projects, and the data display sections. Toggl returns time entries with duration in seconds — plan for your API route to convert seconds to hours and minutes for display, and include this conversion in how you describe the data to V0. For a client billing report, describe the hierarchical structure — client overview at the top, project breakdown in the middle, individual time entry details at the bottom — so V0 generates the correct nested layout. Be specific about number formatting: hours should display as '8h 45m' not '8.75', and currency should show as '$1,312.50'. V0 handles these formatting requests well when specified explicitly. After generating, push to GitHub using V0's Git panel.

V0 Prompt

Build a time tracking summary dashboard. At the top, show three KPI cards: 'Hours This Week' (e.g. 32h 15m), 'Billable Hours' (e.g. 28h 30m), and 'Billability Rate' (e.g. 88%). Below, a horizontal bar chart (Recharts) showing hours per project with project name labels on the y-axis and hour labels on bars. Then a recent time entries table with columns: Date, Project (colored badge), Description, Duration. Include a date range quick-select (This Week / This Month / Last Month) at the top-right. Show skeleton loaders for all sections. Fetch from /api/toggl/summary.

Paste this in V0 chat

Pro tip: Ask V0 to format time duration as 'Xh Ym' (e.g., '8h 45m') rather than decimal hours (e.g., '8.75') in your UI. This matches how Toggl displays time and is more readable for billing purposes.

Expected result: A time tracking dashboard renders in V0's preview with KPI cards, project chart, time entry table, skeleton loading states, and date range selectors. The component fetches from /api/toggl/summary.

2

Create the Toggl API Routes

Create the Next.js API routes that fetch data from the Toggl Track API v9. Toggl's API base URL is https://api.track.toggl.com/api/v9 and it uses HTTP Basic Authentication with your API token as the username and the literal string 'api_token' as the password. The Authorization header value is 'Basic ' followed by a Base64-encoded string of 'your-api-token:api_token'. In Node.js, generate this with Buffer.from(`${apiToken}:api_token`).toString('base64'). The key endpoints are: GET /workspaces/{workspace_id}/time_entries for listing time entries with start and end date filters, GET /workspaces/{workspace_id}/projects for project list with IDs, names, colors, and billable flags, and GET /me for current user information. For aggregated reports, use the Toggl Reports API at https://api.track.toggl.com/reports/api/v3 which provides pre-computed summaries. The reports API uses the same Basic Auth credentials. The time entries endpoint accepts start and end query parameters in ISO 8601 format (2024-01-01T00:00:00Z). Duration from Toggl is returned in seconds — convert to hours for display using Math.floor(seconds / 3600) for hours and Math.floor((seconds % 3600) / 60) for minutes. Time entries that are currently running have a duration of -1 * (Unix timestamp of start time) — check for negative duration values to identify in-progress timers.

app/api/toggl/summary/route.ts
1// app/api/toggl/summary/route.ts
2import { NextRequest, NextResponse } from 'next/server';
3
4const TOGGL_API_BASE = 'https://api.track.toggl.com/api/v9';
5
6function getTogglHeaders(apiToken: string) {
7 const credentials = Buffer.from(`${apiToken}:api_token`).toString('base64');
8 return {
9 Authorization: `Basic ${credentials}`,
10 'Content-Type': 'application/json',
11 };
12}
13
14function formatDuration(seconds: number): string {
15 // Toggl returns negative seconds for running timers
16 const totalSeconds = seconds < 0 ? 0 : seconds;
17 const hours = Math.floor(totalSeconds / 3600);
18 const minutes = Math.floor((totalSeconds % 3600) / 60);
19 return hours > 0 ? `${hours}h ${minutes}m` : `${minutes}m`;
20}
21
22export async function GET(request: NextRequest) {
23 const apiToken = process.env.TOGGL_API_TOKEN;
24 const workspaceId = process.env.TOGGL_WORKSPACE_ID;
25
26 if (!apiToken || !workspaceId) {
27 return NextResponse.json(
28 { error: 'Toggl is not configured' },
29 { status: 500 }
30 );
31 }
32
33 const { searchParams } = new URL(request.url);
34 // Default to current week
35 const now = new Date();
36 const startOfWeek = new Date(now);
37 startOfWeek.setDate(now.getDate() - now.getDay());
38 startOfWeek.setHours(0, 0, 0, 0);
39
40 const startDate =
41 searchParams.get('start') ?? startOfWeek.toISOString();
42 const endDate =
43 searchParams.get('end') ?? new Date().toISOString();
44
45 const headers = getTogglHeaders(apiToken);
46
47 try {
48 // Fetch time entries and projects in parallel
49 const [entriesRes, projectsRes] = await Promise.all([
50 fetch(
51 `${TOGGL_API_BASE}/workspaces/${workspaceId}/time_entries?start_date=${startDate}&end_date=${endDate}`,
52 { headers }
53 ),
54 fetch(
55 `${TOGGL_API_BASE}/workspaces/${workspaceId}/projects?active=true`,
56 { headers }
57 ),
58 ]);
59
60 if (!entriesRes.ok || !projectsRes.ok) {
61 return NextResponse.json(
62 { error: 'Failed to fetch Toggl data' },
63 { status: 500 }
64 );
65 }
66
67 const [entries, projects] = await Promise.all([
68 entriesRes.json() as Promise<unknown[]>,
69 projectsRes.json() as Promise<unknown[]>,
70 ]);
71
72 // Build project lookup map
73 const projectMap = new Map(
74 (projects as Array<{ id: number; name: string; color: string; billable: boolean }>).map(
75 (p) => [p.id, p]
76 )
77 );
78
79 // Aggregate hours by project
80 const projectTotals: Record<string, number> = {};
81 let totalSeconds = 0;
82 let billableSeconds = 0;
83
84 const normalizedEntries = (entries as Array<{
85 id: number;
86 description: string;
87 duration: number;
88 start: string;
89 project_id: number | null;
90 }>).map((entry) => {
91 const duration = entry.duration < 0 ? 0 : entry.duration;
92 const project = entry.project_id ? projectMap.get(entry.project_id) : null;
93 totalSeconds += duration;
94 if (project?.billable) billableSeconds += duration;
95 const projectName = project?.name ?? 'No Project';
96 projectTotals[projectName] = (projectTotals[projectName] ?? 0) + duration;
97 return {
98 id: entry.id,
99 description: entry.description ?? '',
100 duration: formatDuration(duration),
101 durationSeconds: duration,
102 project: projectName,
103 projectColor: project?.color ?? '#999',
104 date: entry.start,
105 };
106 });
107
108 const projectBreakdown = Object.entries(projectTotals)
109 .map(([name, secs]) => ({
110 name,
111 hours: parseFloat((secs / 3600).toFixed(1)),
112 formatted: formatDuration(secs),
113 }))
114 .sort((a, b) => b.hours - a.hours);
115
116 return NextResponse.json({
117 summary: {
118 totalHours: formatDuration(totalSeconds),
119 billableHours: formatDuration(billableSeconds),
120 billabilityRate:
121 totalSeconds > 0
122 ? Math.round((billableSeconds / totalSeconds) * 100)
123 : 0,
124 },
125 projectBreakdown,
126 recentEntries: normalizedEntries.slice(0, 20),
127 });
128 } catch (error) {
129 const message = error instanceof Error ? error.message : 'Unknown error';
130 console.error('Toggl summary failed:', message);
131 return NextResponse.json(
132 { error: 'Failed to load time summary', details: message },
133 { status: 500 }
134 );
135 }
136}

Pro tip: Fetch time entries and projects in parallel using Promise.all() — the two Toggl API calls are independent and running them simultaneously cuts the API route response time roughly in half compared to sequential fetches.

Expected result: GET /api/toggl/summary returns aggregated time data including total hours, billable rate, project breakdown with hours per project, and recent time entries with formatted durations.

3

Add Environment Variables and Deploy to Vercel

Push your code to GitHub and configure Toggl credentials in Vercel. Open the Vercel Dashboard, select your project, and navigate to Settings → Environment Variables. Add TOGGL_API_TOKEN with your Toggl API token — found in Toggl Dashboard → Profile icon (top-right) → Profile Settings → scroll to the bottom of the page, then click 'Click to reveal' under the API Token section and copy the token. Add TOGGL_WORKSPACE_ID with your workspace ID — find this in Toggl Dashboard → Settings → Workspaces (click the workspace name) and look at the URL, which contains the workspace ID as a number (e.g., https://track.toggl.com/workspaces/1234567/settings shows workspace ID 1234567). Neither variable should have the NEXT_PUBLIC_ prefix — they are server-side secrets. Set all variables for Production, Preview, and Development environments. Click Save and trigger a redeployment. After deployment, open your deployed dashboard and verify real Toggl data appears. Check the Vercel function logs if the dashboard shows errors — common issues are incorrect workspace ID, expired API token, or insufficient permissions for team workspace API access.

Pro tip: Toggl API tokens do not expire unless you regenerate them manually. However, rotating the token periodically is a good security practice — update TOGGL_API_TOKEN in Vercel and redeploy when you regenerate the token in Toggl Profile Settings.

Expected result: The deployed Vercel app displays real Toggl time data — weekly hours, project breakdown, and recent entries — pulled directly from your Toggl workspace.

Common use cases

Freelancer Weekly Time Report

A personal dashboard showing this week's tracked hours by project, with a breakdown of billable vs non-billable time, a daily activity chart, and a total earnings estimate based on configured hourly rates. The freelancer can see at a glance whether they are on track for their weekly billing target.

V0 Prompt

Create a freelancer time dashboard with a 'This Week' header showing total hours tracked and a progress bar toward a 40-hour weekly goal. Below, show a project breakdown as a horizontal bar chart with project name, hours tracked, and estimated earnings (at a hardcoded $150/hr). Add a daily hours chart (bar chart by day Mon-Sun) and a recent time entries table with project name, description, duration, and date columns. Fetch from /api/toggl/summary. Use a modern productivity tool design.

Copy this prompt to try it in V0

Client Billing Summary Portal

A client-facing portal where V0 generates a clean billing statement showing all time entries for a specific client within a date range. The portal displays project breakdown, task-level detail, and a total invoice amount for easy review before billing.

V0 Prompt

Build a client billing report page with a client name header, date range selector (this month / last month / custom), and total hours and billing amount displayed prominently. Below, show a Project Breakdown table with columns: project name, tasks description, hours, rate, subtotal. Add a detailed entries collapsible section per project listing each time entry with date, description, and duration. Include a Download PDF button. Fetch from /api/toggl/client-report. Professional invoice design.

Copy this prompt to try it in V0

Team Productivity Analytics

An internal analytics dashboard showing team time allocation across projects, identifying the highest-investment projects, tracking billability ratio per team member, and visualizing time distribution trends over the past 4 weeks.

V0 Prompt

Design a team productivity dashboard with four metric cards at the top: Total Hours This Month, Billable Ratio %, Most Active Project, and Team Members Active. Below, two charts side by side: a donut chart showing hours by project and a line chart showing daily hours over 30 days per team member. Add a team leaderboard table with member name, total hours, billable hours, and billability percentage. Fetch from /api/toggl/team-summary.

Copy this prompt to try it in V0

Troubleshooting

API returns 403 Forbidden despite correct API token

Cause: The workspace ID does not belong to the authenticated user, or the user does not have sufficient permissions to read workspace data (required for team workspace data in paid plans). The API token has account-level access but workspace data access depends on the user's role.

Solution: Verify the workspace ID in Toggl Dashboard → Settings → Workspaces and confirm you have Admin access to the workspace if accessing team member data. For personal workspaces, the workspace ID in the URL when you visit the Toggl dashboard is the correct ID.

Time entries return empty array even though entries exist in Toggl

Cause: The start_date and end_date parameters are in the wrong format or timezone. Toggl requires ISO 8601 format with timezone offset, and entries outside the specified date range are not returned. A common mistake is using a date without time component.

Solution: Use full ISO 8601 timestamps with timezone: new Date().toISOString() produces the correct format (e.g., 2024-01-15T00:00:00.000Z). Verify the start date includes the beginning of the period (midnight) and end date includes the end (11:59 PM or next day midnight).

typescript
1// Correct date format for Toggl API:
2const startDate = '2024-01-01T00:00:00+00:00'; // Start of Jan 1
3const endDate = '2024-01-31T23:59:59+00:00'; // End of Jan 31
4// Or use ISO format from Date:
5const start = new Date();
6start.setDate(start.getDate() - 7);
7const startISO = start.toISOString();

Duration values appear negative in some entries

Cause: Toggl represents currently running time entries with a negative duration: the value is -(Unix timestamp of when the timer started). This is a Toggl API design decision for indicating in-progress timers.

Solution: Check for negative duration values and handle them as 'running' timers. Calculate the current duration for running timers by adding the absolute value of the duration to the current Unix timestamp. The code example above handles this with Math.abs and a 0 fallback.

typescript
1// Handle running timers:
2const isRunning = entry.duration < 0;
3const duration = isRunning
4 ? Math.floor(Date.now() / 1000) + entry.duration // Current duration
5 : entry.duration;

Project colors from Toggl API are not the same colors shown in the Toggl app

Cause: Toggl stores project colors as hex codes in their API but the Toggl app maps some legacy color codes to CSS classes. Projects created before a certain date may have integer color codes instead of hex strings.

Solution: Add a color normalization step in your API route that converts any numeric color codes to their hex equivalents using Toggl's color palette mapping. Modern Toggl projects return hex colors directly. Add a fallback color (#999999) for any unrecognized formats.

Best practices

  • Store TOGGL_API_TOKEN as a server-only Vercel environment variable without NEXT_PUBLIC_ prefix — the API token grants full read/write access to your Toggl workspace
  • Fetch time entries and projects in parallel with Promise.all() rather than sequentially — this halves the API route response time for dashboard queries that need both datasets
  • Handle negative duration values from Toggl (running timers) explicitly — ignoring them causes incorrect totals and crashes in aggregation code
  • Convert Toggl's second-based durations to human-readable 'Xh Ym' format in your API route rather than the frontend — this keeps the display logic server-side and consistent across components
  • Cache project and workspace data (which changes rarely) separately from time entries (which change frequently) — use longer revalidation for the projects endpoint and no caching for the current-week entries
  • Add date range filtering with sensible defaults (current week) rather than fetching all time entries — Toggl workspaces with years of data can return thousands of entries without a date range filter
  • For client billing reports, add a per-project hourly rate configuration so the dashboard can calculate invoice amounts — store these rates in your own database or Vercel environment variables rather than using Toggl's paid billing features

Alternatives

Frequently asked questions

Does Toggl have a free API or do I need a paid plan?

The Toggl Track API is available on all plans including the free plan. The free plan includes 5 projects but full API access for time entries, workspaces, and personal data. The Reports API (pre-aggregated reports) is available on the Starter plan and above. For most dashboard use cases fetching raw time entries and computing aggregations yourself, the free plan API is sufficient.

What is the difference between the Toggl Track API and the Toggl Reports API?

The Toggl Track API (api.track.toggl.com/api/v9) provides raw CRUD access to all entities — time entries, projects, clients, tags, workspace members. The Toggl Reports API (api.track.toggl.com/reports/api/v3) provides pre-computed summary and detailed reports similar to what you see in Toggl's own reporting UI. For simple dashboards with custom aggregations, the Track API is sufficient. For complex reports matching Toggl's native report formats, the Reports API is more efficient as it handles grouping and aggregation server-side.

Can I create and stop time entries from my V0 app via the Toggl API?

Yes — the Toggl API supports full CRUD for time entries. POST /workspaces/{workspace_id}/time_entries creates a new time entry with a start time and optionally a project. To stop a running timer, PATCH the time entry with a stop timestamp. This enables building a custom timer interface in V0 that controls Toggl tracking from your app rather than the Toggl interface.

How do I access team members' time entries in my dashboard?

Team member time entry access is available on Toggl's Starter plan and above through the workspace API endpoints. Your API token must belong to a workspace admin. Use GET /workspaces/{workspace_id}/time_entries with the user_ids query parameter to filter by specific team members. The workspace members endpoint (GET /workspaces/{workspace_id}/workspace_users) returns user IDs and emails for all team members.

Can I integrate Toggl with my invoicing or accounting software via V0?

Yes — your Next.js API routes can fetch Toggl time data and then call a separate accounting API (like QuickBooks, Xero, or FreshBooks) to create invoices. The workflow is: fetch time entries from Toggl filtered by client/project and date range, aggregate total hours, then POST an invoice to your accounting software with the calculated amounts. This creates an invoice pipeline that pulls directly from tracked time without manual data entry. For complex integrations, RapidDev's team can help wire up the full Toggl-to-accounting integration.

What is the Toggl API rate limit?

Toggl's API rate limit is 1 request per second per API token. For dashboard use cases where users view reports infrequently, this limit is rarely a concern. If you build features that poll Toggl frequently (like a real-time timer widget), implement client-side polling intervals of at least 5 seconds and cache API route responses to avoid hitting the rate limit.

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