How to Chain Pipes in Angular: Syntax and Examples

In Angular, you chain pipes by using multiple | symbols in your template expressions, applying each pipe in sequence. For example, {{ value | pipe1 | pipe2 }} passes the output of pipe1 as input to pipe2, allowing multiple transformations in one expression.

Syntax

To chain pipes in Angular, use the | symbol between each pipe in your template expression. The output of the first pipe becomes the input of the next pipe, and so on.

• value: The data you want to transform.
• |: The pipe operator to apply a transformation.
• pipeName: The name of the pipe to apply.

html

{{ value | pipe1 | pipe2 | pipe3 }}

Example

This example shows chaining the built-in uppercase pipe with the slice pipe to first convert text to uppercase, then extract a substring.

html

<!-- app.component.html -->
<p>{{ 'angular pipes' | uppercase | slice:0:7 }}</p>

Output

ANGULAR

Common Pitfalls

Common mistakes when chaining pipes include:

• Forgetting the | between pipes, which causes syntax errors.
• Using pipes that expect different input types without proper conversion.
• Passing incorrect parameters to pipes.

Always ensure each pipe's output matches the next pipe's expected input.

html

<!-- Wrong: missing pipe operator -->
<p>{{ 'text' uppercase slice:0:3 }}</p>

<!-- Right: correct chaining -->
<p>{{ 'text' | uppercase | slice:0:3 }}</p>

Quick Reference

Tips for chaining pipes in Angular:

• Use | to separate each pipe.
• Order matters: pipes run left to right.
• Check pipe input/output types for compatibility.
• Use parameters after colon : for pipes that accept arguments.

Key Takeaways

Chain pipes in Angular templates using multiple | operators in sequence.

The output of one pipe becomes the input of the next pipe in the chain.

Always separate pipes with | and pass parameters with colons.

Check that each pipe's input and output types match to avoid errors.

Order of pipes affects the final transformed output.