HAR-mock-server / har-mocker

Mock server from an HAR file.

From Chrome/Firefox, open the dev tools, record queries, and export it :

• Export HAR buton on Chrome
• Save All As HAR on Firefox by right click on queries.

And replay the queries with this mock server (npx har-mocker file.har) : it returns responses for requests matching the requested path (ignoring the hostname).

Run / Installation

With node

• With npx : npx har-mocker examples/jsonplaceholder_simplified.har
• or install it :
  • with npm i -g har-mocker
  • and run with har-mocker examples/jsonplaceholder_simplified.har

With deno

• From source :
  • Run directly : ./har-mock-server-deno.ts examples/jsonplaceholder_simplified.har
  • Install : deno install --name har-mock-server -f -g -NR ./har-mock-server-deno.ts → then use with har-mock-server file.har
• Run from jsr :
  • Run directly : deno run -NR jsr:@jersou/[email protected] examples/jsonplaceholder_simplified.har
  • Install : deno install --name har-mock-server -f -g -NR jsr:@jersou/[email protected] → then use with har-mock-server file.har

Usage

$ ./har-mock-server(-deno.ts|.js) --help
Run a mock server based on queries from an HAR file

Usage: har-mock-server [Options] <HAR file>

Options:
 -h, --help Show this help    [default: false]
 -p, --port Port of the server [default: 8080]

Exemple

./har-mock-server.js examples/jsonplaceholder_simplified.har
# or with deno : ./har-mock-server-deno.ts examples/jsonplaceholder_simplified.har

The examples/jsonplaceholder_simplified.har file contains 3 queries :

{ "log": { "entries": [
      { "request": { "url": "https://jsonplaceholder.typicode.com/todos/2", ... },
      { "request": { "url": "https://jsonplaceholder.typicode.com/todos/10?param=5", ... },
      { "request": { "url": "https://jsonplaceholder.typicode.com/todos/10?param=9", ... }
] } }

A query found in the HAR file :

$ curl "http://localhost:8080/todos/10?param=5"
{ "userId": 1, ... }%

A missing query from the HAR file :

$ curl "http://localhost:8080/todos/10?param=8"
Mock not found%

The server logs :

$ har-mock-server examples/jsonplaceholder_simplified.har
Listening on http://0.0.0.0:8080/ (http://localhost:8080/)
[200] GET http://localhost:8080/todos/10?param=5
[404] entry not found : GET http://localhost:8080/todos/10?param=8

Simplify HAR file (with deno)

To reduce HAR size to keep the minimum :

./har-simplify-deno.ts ./http1.har

→ ./http1_simplified.har is created.