Array.toString() Convert an array to a string
Last updated: 2026-10-13
Array.toString() Convert an array to a string
toString returns all elements joined by commas — equivalent to join(','). Nested arrays are flattened, and null / undefined become empty strings.
| Category | Arrays |
|---|---|
| ES version | ES1 (1997) |
📝 Syntax
array.toString();Returns：A comma-separated string.
Mutates the original：No (returns a new value)
▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
apple,banana,orange
true
1,2,3,4
1,,,4ℹ️ info toString is usually called implicitly: "items: " + [1,2] yields "items: 1,2".
💡 Tip Use join(" | ") for a custom glue; use JSON.stringify to preserve nesting.
🌐 Browser support
| Browser |  Chrome |
 Edge |
 Firefox |
 Safari |
 Opera |
|---|---|---|---|---|---|
| Array.toString() | ✓ v1 | ✓ v12 | ✓ v1 | ✓ v1 | ✓ v4 |
| Supported by all modern browsers | |||||
🏷️ Related Array Methods
💡 Related Cases
More case studies coming soon — check back later.
📚 Related Tutorials
❓ FAQ
QtoString vs join?
AtoString is fixed to commas with no arguments; join accepts any separator.
QHow to get JSON instead?
AUse JSON.stringify(arr) — it keeps structure and quotes strings.
QWhat about sparse arrays?
AHoles behave like undefined: [1,,3].toString() gives "1,,3".
