to

Try It

Auto Test via axios inside Node.js itself

Promise based HTTP client for the browser and node.js

// Automation Testing
console.log("=== Automation Testing ===");

const axios = require('axios');

axios.post('http://localhost/latex2svg', {
  latex: '$$\frac{1}{2}$$'
}).then(res => {
    console.log(`Response.data : `, res.data);
});

Requester (Sublime Text Package)

HTTP Requester, even support GraphQL for automation tests. Text based, fast and portable.

Browser Web Fetch

Using Fetch

index.html

function latex2svg(latex) {

  fetch('/.netlify/functions/latex2svg', {
      method: 'POST',
      body: JSON.stringify(latex),
      headers: new Headers({
        'Content-Type': 'application/json'
      }),
      mode: 'cors' // no-cors, cors, *same-origin
    }).then(response => {
      return response.json();
    }).then(json => {
      container = document.getElementById('svg_container');
      container.innerHTML = json.svg;
    }).catch( error => {
      console.log("Something Wrong");
   });;
}

latex2svg({ "latex" : '\$\$\\LaTeX \\frac{1}{3}\$\$'});

no-cors is required to cross origin access when tring to load my service directly in your own html.

Netlify Deployment

Free serverless web service

GitHub (Push = Auto Deploy)

netlify-lambda functions

npm run netlify-lambda build functions

functions/lambda.js

exports.handler = function(event, context, callback) {
   // event.body
   // context for dev/prod environment info
   callback(null, {
     statusCode: 200,
     body: {svg: "<svg></svg>"}
   });
}

netlify.toml

[build]
    function = "lambda" // the compiled path of lambda functions

Tests

nodemon app.js 
  or 
npm run start

axios to send the test requests after launch automatically.
It's possible to write the automation tests with assert too.

## localhost node app.js test
requests.post('http://localhost/.netlify/functions/latex2svg',
    json = {"latex": "$$\frac{}$$"})

## localhost netlify-lambda serve functions test.
requests.post('http://localhost:9000/.netlify/functions/latex2svg',
    json = {"latex": "$$\\frac{1}{6}$$"})

## netlify-lambda function server test
requests.post('https://rintaroutw-latex2svg.netlify.com/.netlify/functions/latex2svg',
    json = {"latex": "$$\\frac{1}{6}$$"})