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Parse web pages using CSS query selectors
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Latest commit e813ce2 May 13, 2019

This project is no longer active developement, please see CoolQLCool for a similar more active project (ref)


Jam API is a service that allows you to turn any site into a JSON accessible api using CSS selectors. To get started simply run a post request to with formdata of "url" and "json_data", here's an example of what your data should look like:

  "title": "title",
  "logo": ".nav-logo img",
  "paragraphs": [{ "elem": ".home-post h1", "value": "text"}],
  "links": [{"elem": ".home-post > a:first-of-type", "location": "href"}]

Using API you can simply generate JSON data from any website.

Code samples


const request = require('request');'', {form: {url: '', json_data: '{"title": "title"}'}}, function(err, response, body) {


fetch('', {
    method: 'POST',
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json'
    body: JSON.stringify({
      url: '',
      json_data: '{"title": "title"}'
  }).then(function(response) {
    return response.json();
  }).then(function(json) {
    document.body.innerHTML = json;


require 'httparty'
response ="",
  :body => { "url" => "", "json_data" => "{'title': 'title'}"})  
puts response.to_json


import requests
payload = {'url': '', 'json_data': '{"title": "title"}'}

r ="", data=payload)


curl -X POST \
  -F 'url=' \
  -F 'json_data={"title":"title"}' \


Will auto pull the img src on corresponding elements, will auto pull the href from links. If passing JSON, you must provide a "elem" property, and then the element attributes you want. When you pass an array with JSON you'll get a structure that looks as follows:

      "index": 0,
      "value": {
          "value": "Porter Robinson – Sad Machine (Cosmo’s Midnight Remix)"
      "index": 1,
      "value": {
          "value": "Listen to Rachel Platten’s “Stand By You”"

All the attributes you provide as JSON will be put inside of the value property, and the index property is to be able to track what index it ocurred in the DOM. I nested JSON values into it's own so that you can still have an "index" property returned and not run into issues.

How it works

Main power of the program is in services/html_to_json.js. Start site with node index after doing npm install.

Suggested node version is at least 4.2.2

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