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# Working With: Aliased Parameters

When doing operations on folder or files it can occasionally happen that you exceed the url length due to the inclusion of paths in the arguments. To address this we added support for aliasing parameters to any method call in 2.0.3.

To alias a parameter you include the label name, a separator ("::") and the value in the string. You also need to prepend a "!" to the string to trigger the replacement. You can see this below, as well as the string that will be generated. Labels must start with a "@" followed by a letter. It is also your responsibility to ensure that the aliases you supply do not conflict, for example if you use "@p1" you should use "@p2" for a second parameter alias in the same query.

### Construct a parameter alias

Pattern: !@{label name}::{value}

Example: "!@p1::\sites\dev" or "!@p2::\text.txt"

### Example without aliasing

// still works as expected, no aliasing
const query = pnp.sp.web.getFolderByServerRelativeUrl("/sites/dev/Shared Documents/").files.select("Title").top(3);

console.log(query.toUrl()); // _api/web/getFolderByServerRelativeUrl('/sites/dev/Shared Documents/')/files
console.log(query.toUrlAndQuery()); // _api/web/getFolderByServerRelativeUrl('/sites/dev/Shared Documents/')/files?$select=Title&$top=3

query.get().then(r => {

console.log(r);
});

### Example with aliasing

// same query with aliasing
const query = pnp.sp.web.getFolderByServerRelativeUrl("!@p1::/sites/dev/Shared Documents/").files.select("Title").top(3);

console.log(query.toUrl()); // _api/web/getFolderByServerRelativeUrl('!@p1::/sites/dev/Shared Documents/')/files
console.log(query.toUrlAndQuery()); // _api/web/getFolderByServerRelativeUrl(@p1)/files?@p1='/sites/dev/Shared Documents/'&$select=Title&$top=3

query.get().then(r => {

console.log(r);
});

### Example with aliasing and batching

Aliasing is supported with batching as well:

// same query with aliasing and batching
const batch = pnp.sp.web.createBatch();

const query = pnp.sp.web.getFolderByServerRelativeUrl("!@p1::/sites/dev/Shared Documents/").files.select("Title").top(3);

console.log(query.toUrl()); // _api/web/getFolderByServerRelativeUrl('!@p1::/sites/dev/Shared Documents/')/files
console.log(query.toUrlAndQuery()); // _api/web/getFolderByServerRelativeUrl(@p1)/files?@p1='/sites/dev/Shared Documents/'&$select=Title&$top=3

query.inBatch(batch).get().then(r => {

console.log(r);
});

batch.execute();