Pre-Request Scripts

JetBrains pre-request scripts

Pre-request scripts execute before the request is sent, allowing dynamic variable setup:

JetBrains

< {%
const timestamp = Date.now();
request.variables.set("timestamp", timestamp);
%}

POST https://api.example.com/signed
X-Timestamp: {{timestamp}}

httpyac

{{
const crypto = require('crypto');
exports.signature = crypto.createHmac('sha256', 'secret')
  .update(request.method + request.url)
  .digest('base64');
}}

GET https://api.example.com/resource
X-Signature: {{signature}}

Request object API

• request.variables.set/get() — read/write request-scoped variables
• request.environment.get() — read environment variables
• request.body.getRaw() — raw request body
• request.body.tryGetSubstituted() — body with variables resolved
• request.url.getRaw() — raw URL
• request.headers.all — all headers
• request.method — HTTP method

Crypto API

JetBrains exposes a Crypto API: crypto.hmac.sha256(), crypto.sha256(), crypto.sha512(), etc. with chained methods for text/hex/base64 input and output.

httpyac pre-request scripts

In httpyac, double-brace blocks positioned before the request line serve as pre-request scripts. Values exported via exports.variableName become available as variables. The request object is accessible for inspection.

VS Code REST Client and Visual Studio 2022

Neither supports pre-request scripts.

kulala.nvim

Supports JetBrains-compatible pre-request scripts in both JavaScript and Lua.