function jsonAPI(anExport, aFunction)
{
var runkitExpress = require("@runkit/runkit/express-endpoint/1.0.0")
var bodyParser = require('body-parser');
var app = runkitExpress(anExport)
app.set('json spaces', 2);
app.use(require('compression')())
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
// add CORS headers, so the API is available anywhere
app.use(function(req, res, next)
{
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Expose-Headers", "runkit-rate-limit-remaining");
res.header("Access-Control-Expose-Headers", "tonic-rate-limit-remaining");
var reqHeaders = req.get("Access-Control-Request-Headers")
if (reqHeaders) res.header("Access-Control-Allow-Headers", reqHeaders);
var reqMethods = req.get("Access-Control-Request-Methods")
if (reqMethods) res.header("Access-Control-Allow-Methods", reqMethods);
next()
})
app.all('/', async function(request, response, next)
{
try
{
var requestData = {
method: request.method,
body: request.body,
query: request.query
}
var responseData = await (aFunction.length === 2 ?
(new Promise(function(resolve) {
aFunction(requestData, resolve)
})) : aFunction(requestData))
if (responseData)
response.json(responseData)
else
response.status(201).end()
}
catch(anException)
{
response.status(500)
response.json({
message: "unable to process request",
error: anException.toString()
})
}
})
return app;
}
module.exports = jsonAPI;
This helper creates a simple JSON API that accepts JSON request data and returns a JSON response. It can be used two different ways, depending on the callback's signature. The incoming data is an object with three properties:
- "method": the request method used
- "body": the data sent in the body of the request
- "query": any query parameters sent in the request
If the "arity" (the number of arguments) of the provided callback function is 1, then you can return a response directly, or a promise that eventually resolves to the data. Here's an example use: https://runkit.com/runkit/json-endpoint-example-1
If the "arity" is 2, then the second parameter is a "done" callback that you should call yourself whenever you want to return a response. You can pass the response as the only argument to the callback. Here's an example use: https://runkit.com/runkit/json-endpoint-example-2
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