Google Sheets Sync Dropping or Duplicating Records
Your Base44 app syncs data to Google Sheets for reporting or external access, but the sync is unreliable. Records are missing from the spreadsheet, some records appear multiple times, data in the sheet doesn't match the app, or the sync stops working entirely after running fine for weeks.
Google Sheets sync is commonly used in Base44 apps for sharing data with team members who prefer spreadsheets, creating reports, feeding data to other tools that read from Sheets, and maintaining backups. When the sync breaks, downstream processes that depend on the spreadsheet data also break.
The issue is especially frustrating because it's non-deterministic. Most records sync correctly, but a random subset is missing or duplicated, making it hard to trust any of the data.
Error Messages You Might See
Common Causes
- Rate limiting by Google Sheets API — Too many write requests hit the Sheets API rate limit, causing some operations to silently fail
- No unique identifier for upsert — Without a unique key to match records, the sync creates new rows instead of updating existing ones
- Concurrent writes corrupting rows — Multiple sync operations writing to the sheet simultaneously cause row conflicts
- Column mapping drift — Columns were added or renamed in Base44 but not updated in the sync configuration
- OAuth token expiration — The Google OAuth token used for Sheets access expired and wasn't refreshed
How to Fix It
- Add a unique identifier column — Use a unique record ID as the first column in the sheet. Match on this ID to update existing rows instead of always appending
- Implement batch writing — Instead of writing one row at a time, batch changes and write them in a single API call to avoid rate limits
- Add sync logging — Log every sync operation (create, update, skip) with the record ID so you can audit what happened
- Handle OAuth token refresh — Implement automatic token refresh and alert when Google authorization needs to be re-granted
- Verify column mapping regularly — After any schema change in Base44, verify the column mapping in the sync configuration still matches
Real developers can help you.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
Matthew Jordan
I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Matthew Butler
Systems Development Engineer @ Amazon Web Services
zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value.
legrab
I'll fill this later
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Why are some records missing from my Google Sheet?
The most common cause is Google Sheets API rate limiting. When too many writes happen quickly, some fail silently. Implement batch writing and add logging to track which records were successfully synced.
How do I prevent duplicate rows in the synced Google Sheet?
Use a unique record ID column as the key for matching. Before writing a new row, check if a row with that ID already exists and update it instead. This 'upsert' pattern prevents duplicates.