Shared CRM helpers
A library exports findContactByEmail and logActivity used by Sales and Support workbook scripts alike.
What is an Apps Script library in Google Sheets?
An Apps Script library is a shared script project you attach to other projects by script ID. Instead of copy-pasting the same utility functions into fifty workbooks, you publish one library and call LibraryName.doSomething() from each bound sheet. Libraries help teams standardize CRM helpers, API wrappers, and formatting tools.
When to use it
Use a library when the same vetted code ships to many spreadsheets: shared validation, consistent API clients, or company-wide menu utilities you update in one place.
When to skip it
Skip libraries for a one-off ten-line script or when every customer needs heavily forked logic. A single bound file is simpler until duplication hurts.
How it works
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1
Create a standalone Apps Script project with the shared functions.
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2
Deploy > New deployment, type Library, note the script ID and version.
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3
In the consumer spreadsheet project, open Libraries, paste the script ID, pick a version.
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4
Google assigns a default identifier like MyLibrary; call MyLibrary.formatCurrency(amount).
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Update the library version in consumers when you publish breaking changes.
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6
Library runs with the consumer project's authorization and triggers context.
Examples in Google Sheets
API wrapper
UrlFetchApp logic for your product API lives in one library; each sheet only passes row data.
Versioned rollout
Development library version 3 ships to pilot sheets while production stays on version 2 until tested.
Build this without starting from a blank cell
Use a Better Sheets tool for Apps Script library, then watch a walkthrough when you want the full pattern.
Better Sheets resources
Common mistakes
- Using head development version in production consumers, so every library save breaks live sheets.
- Forgetting consumers must re authorize when the library adds new scopes.
- Circular dependencies between libraries and consumers.
- Exposing too many global functions without a clear namespace object.
- Not documenting breaking changes between library versions.
Frequently asked questions
- How do I add a library to my sheet script?
- In the consumer Apps Script editor, click plus next to Libraries, enter the library script ID, select version, and save.
- What is the library identifier?
- The name you call in code, like MyUtils.helper(). You can rename it when adding the library.
- Can bound scripts use libraries?
- Yes. Container-bound projects attach libraries like standalone projects do.
- Do libraries copy when I duplicate a spreadsheet?
- Library references may copy, but verify version and authorization in the new file.
- Who pays for library execution time?
- The consumer script execution counts against the account running that script, including library code time.
- Can libraries include HTML?
- Libraries are usually .gs logic. HTML for UIs typically stays in the consumer project or you pass strings carefully.
- How do I update all consumers?
- Publish a new library version and bump each consumer project's library version in Libraries settings.
- Is a library the same as an add-on?
- No. Libraries are code includes for developers. Add-ons are published Marketplace products for end users.
Related Tutorials
Watch how Apps Script library works
10 Google Sheets I Wish Someone Would Make
Advanced Coding in Google Sheets for Programmers
Tips to Navigating Thousands of Lines of Code In Apps Script
From Sheet to Script And Back Again - Learn to Code In Google Sheets Part 3
Curate Google Sheets Easily - Automatic Bookmarklet Maker
Related blog posts
Guides that explain Apps Script library in more depth.
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Read post →Related glossary terms
Script Editor
The Script Editor is the Apps Script workspace inside your spreadsheet where you write JavaScript that talks to Sheets, Gmail, and other Google services. You open it from Extensions > Apps Script. Every function you save can be run manually, bound to a trigger, or linked from a custom menu.
Read guide →Google Sheets automation
Automation means work happens without repeating the same clicks every day: imports update, emails send, rows move, and dashboards refresh. In Sheets, automation usually stacks built-in features, Apps Script, and sometimes the Sheets API or add-ons. Start with the lightest tool that still solves the job.
Read guide →Apps Script web apps
A web app turns your script into a URL that runs doGet or doPost when someone visits or posts data. The page can read and write your spreadsheet behind the scenes, which is useful for simple forms, internal tools, and lightweight APIs without standing up a separate server.
Read guide →Google Sheets workflows
A workflow is the path work takes through your sheet: intake, review, approval, done. Good workflows use consistent columns, statuses everyone understands, and just enough automation to move tasks forward without hiding steps from the team.
Read guide →Done reading about Apps Script library?
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