Substring

Extracts part of a string between a start index (inclusive) and end index (exclusive).

Substring takes a string (String) input and outputs the characters from index start (Start, 0-based, inclusive) up to but not including index end (End) on the result (Result) string value output. While end has never been set, the substring runs from start to the end of the string — so a node with only start configured behaves like 'drop the first N characters'. Setting end to -1 also means 'to the end of the string'. Non-string inputs are converted with toString() first, and any input change updates the result immediately.

When to use it

Use it for simple positional trims: a short prefix of an id, truncating a preview, slicing fixed-width data. For pattern-based extraction, case changes or search-and-replace, use Expression or a Function; for assembling text from parts, use String Format.

At a glance

Category	String Manipulation
Type name	Substring
Available in	browser, cloud
SSR compatibility	safe
Provided by	noodl-runtime

Inputs

Values

Name	Type	Default	Description
end	Number	0	Position to stop before; leave it unset to run to the end of the string, since setting it to 0 yields nothing
start	Number	0	Position of the first character to keep, counting from zero; a negative value counts back from the end
string	String	``	Text to take the substring from; it must not be cleared to null, which raises an error rather than yielding an empty result

Outputs

Values

Name	Type	Default	Description
result	String	—	The section of String between Start and End

Patterns

• Unique Id guid → string with start 0 / end 4: a short human-readable tag from a longer id.

Watch out for

• Setting end to 0 expecting 'until the end' — 0 is a real exclusive index and yields an empty string; leave end unset or use -1 instead.

Examples

Debounced autosave with timestamped status

The debounce idiom: every keystroke fires Value Changed, whose signal restarts a 1.5-second Timer — the save only runs when the user pauses. The save Function stamps the moment; Date To String formats it, Unique Id issues a save id shortened by Substring, and String Format assembles the status line. Signals sequence the flow; values shape the display.

Related nodes

String Format, String Mapper, Expression, Function

Generated

This page is generated from node-catalog-enriched.json. Do not edit it by hand — run npm run docs:nodes to regenerate, and fix the source enrichment instead.