Iteration Layer vs ExcelJS
ExcelJS is the go-to Node.js spreadsheet library — great if you're already in Node, not if you're not.
Why developers switch from ExcelJS
ExcelJS means writing row-by-row Node.js code and hosting the service yourself.
Any language, not just Node.js
ExcelJS is a Node.js library. If your backend is Python, Go, Elixir, or anything else, generating Excel files means a sidecar Node.js process. Our API is language-agnostic — one HTTP call from any language.
No infrastructure to manage
Using ExcelJS in production means deploying Node.js, managing memory for large spreadsheet generation, handling concurrency, and monitoring the process. We handle all of that.
Declarative JSON, not cell-by-cell imperative code
ExcelJS requires building spreadsheets row by row, cell by cell: add row, set cell value, set cell style, repeat. Our content model describes the entire spreadsheet in a single JSON payload.
Feature-by-feature comparison
We went through the docs so you don't have to. Here's how every feature compares — including the ones where we're not the better choice.
| Feature | Iteration Layer | ExcelJS |
|---|---|---|
| Formula support |
Yes
Generate spreadsheets with Excel-compatible formulas |
Yes
Full formula support through programmatic API calls |
| Multi-sheet support |
Yes
Generate workbooks with multiple named sheets |
Yes
Full multi-sheet workbook support with programmatic API |
| Output formats |
3 formats
XLSX, CSV, and Markdown output |
2 formats
XLSX and CSV output supported |
| Sheet definition style |
Declarative JSON
Entire spreadsheet described declaratively in a single JSON payload |
Imperative API
Spreadsheets built row by row, cell by cell with imperative API calls |
| Open source |
Proprietary
Closed-source managed SaaS platform |
MIT license
Free and open source under the MIT license |
| Cell formatting |
JSON styling
Cell styles defined through JSON properties in the content model |
Rich formatting
Rich cell formatting including merged cells, conditional formatting, and data validation |
| Community |
Growing
Actively growing platform with expanding documentation |
Established
Large community with active maintenance and frequent releases |
| EU hosting |
EU only
All processing happens exclusively on EU-hosted servers |
Your choice
Runs on your infrastructure, so data residency depends on where you deploy |
| Pricing |
$0.033
1 credit per action |
Compute only
Self-hosted OSS |
| Infrastructure required |
None
Fully managed API with no deployment, scaling, or memory management required |
Self-hosted
Requires deploying and managing a Node.js process in production |
| GDPR / Data privacy |
Zero retention
No files or results stored beyond temporary 90-day logs |
Your responsibility
Data privacy depends entirely on your deployment and infrastructure choices |
Pricing
Start usage-based. Switch to a subscription when your volume becomes predictable.
Usage-based
Graduated pricing. Your effective rate decreases automatically as monthly usage grows.
- No monthly commitment
- Pay only for credits used
- Automatic volume discounts as usage grows
Predictable volume
Fixed recurring credit packs with lower effective credit prices for steady usage.
- Lower effective per-credit prices
- Fixed recurring credit packs
- Predictable monthly budget
Still evaluating?
See how we compare — and where the competition still wins. Choosing the right tool shouldn't require a week of research.
Start building in minutes
Free trial credits included.