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Response template queries

Imposter allows you to respond with a template - that is, a file containing placeholders, which are replaced with values at runtime. See the templates page for more information.

You can also use a JsonPath expression to query an object when using a placeholder.

This is useful if you have an object, such as a request body or object within a store, and wish to render a child property of the object instead of the whole object.

Using JsonPath in placeholders

The JsonPath placeholder syntax is as follows:

<placeholder expression>:<JsonPath expression>

Here is an example that queries the request body:


In this example, the request body is parsed as a JSON object, then the JsonPath expression $.name is executed. The request body looks like this:

  "name": "Alice",
  "occupation": "Programmer"

The result of the query is the string Alice, which is then substituted into the template.

Similarly, you could refer to other properties of the body - occupation would look like this:

Your occupation is: ${context.request.body:$.occupation}

Example using stores

This example fetches an item in a store, and returns the name property using a JsonPath expression.

Learn more about stores.

This will return the name property from the person item in the request store:


This retrieves the item named person from the request store. The item must be an object, or a string representation of a valid JSON object.

The person item looks like this:

  "name": "Alice",
  "occupation": "Programmer"

Since this item is an object, we can use JsonPath to query the name property - hence the expression $.name in the template placeholder.

Templating performance

Using JsonPath in placeholder templates is computationally expensive, as it requires parsing and querying of an item rather than just value substitution.