Scripting

Bruno allows you to write JavaScript code before sending a request (Pre-request) and after receiving a response (Post-response). Use scripts to generate dynamic data, manipulate requests, parse responses, and set variables.

<Card title="JavaScript API Reference" icon="book" href="/testing/script/javascript-reference"

The complete `bru` API — request and response methods, environments, and
utilities.

<Card title="Script Flow" icon="diagram-project" href="/testing/script/script-flow"

When pre-request and post-response scripts run, and in what order across
collection, folder, and request levels.

<Card title="Inbuilt Libraries" icon="cubes" href="/testing/script/inbuilt-libraries"

Libraries bundled with Bruno, ready to require in your scripts.

<Card title="External Libraries" icon="box-open" href="/testing/script/external-libraries"

Use npm packages in your scripts with Developer Mode.

Keep shared script code in standalone .js files inside your collection. <Card title="Dynamic Variables" icon="shuffle" href="/testing/script/dynamic-variables"

Generate random data like names, emails, and UUIDs on every run.

<Card title="Request Chaining" icon="link" href="/testing/script/request-chaining"

Pass data from one request to the next and control execution flow.

<Card title="Request" icon="arrow-up" href="/testing/script/request/request-object"

The `req` object — inspect and modify outgoing requests, and send
synchronous requests from scripts.

<Card title="Response" icon="arrow-down" href="/testing/script/response/response-object"

The `res` object — read status, headers, and body, and query response data.

Get and set variables from scripts with the Vars tab. <Card title="gRPC Scripting" icon="satellite-dish" href="/send-requests/grpc/scripting"

Request-level hooks, `bru.grpc.*` APIs, tests, and assertions on gRPC calls.