Introduction to Timeline JS

Timeline JS is a JavaScript library for building interactive timelines. The project site shows live examples, and an online guide that can generate a timeline from a Google Spreadsheet: fill in the spreadsheet template, set the sheet address and a few options, and the timeline is produced for you.

If the spreadsheet route does not suit you, you can keep the data in JSON and work with it from JavaScript instead.

Bringing the library into a page

Timeline v3 is loaded with a stylesheet and a script, then pointed at a container element that will hold the timeline.

<!-- reference the CSS -->
<link title="timeline-styles" rel="stylesheet" href="https://cdn.knightlab.com/libs/timeline3/latest/css/timeline.css">

<!-- reference the JS -->
<script src="https://cdn.knightlab.com/libs/timeline3/latest/js/timeline.js"></script>

<!-- the container that shows the timeline -->
<div id="timeline-embed" style="width: 100%; height: 600px;"></div>

The files can be pulled from a CDN as shown above, or hosted locally and referenced from your own server.

Two ways to load the data

1. JSON data, processed with JavaScript. Fetch a .json file describing the events and hand it to the library, following the documented steps for instantiating a timeline.
2. A Google Spreadsheet. Use the guide with the provided template, publish it, and pass the published address along with the display options.

The format reference for the data file is published alongside the documentation, and a complete sample — the Whitney Houston timeline — is available in the project repository as a working example of the schema.

Editing the JSON

Hand-writing a long data file gets tiring, so a few helpers make the job easier:

• Smart JSON Editor — a desktop editor for viewing and editing JSON files in a tree view, which makes the nested event structure much easier to navigate.
• SQLite converters — when the events already live in a database, a converter can turn database rows into the JSON structure the library expects.

Both approaches end at the same place: a JSON file that the timeline reads and renders as slides.

Sample material

Official sample timelines include a list of English monarchs and a StoryMapJS project, which show the range of subjects a timeline can cover.

Need	Where to look
Live examples	Examples gallery on the project site
Sheet-driven timeline	Online guide with the Google Spreadsheet template
Data schema	TimelineJS JSON format documentation
Code-based loading	Instantiate a timeline documentation

Building a timeline is one of those quietly satisfying programming tasks: you gather a set of dated events, decide how they should read as a sequence, and then hand the whole thing to a library that handles the layout. Timeline JS exists for exactly this purpose, offering an interactive, horizontally scrolling timeline that runs in the browser and works well with plain JavaScript and JSON data structures rather than heavy frameworks.

One of the more interesting aspects of Timeline JS is the range of ways you can supply content to it. A spreadsheet template can be filled out and pointed to directly, which makes the tool approachable for people who would rather not hand-edit structured data. Alternatively, keeping the event information in JSON and rendering it yourself gives you full control over wording, ordering, and grouping.

The project also publishes documentation and live examples, which is often the fastest way to understand what a timeline library can do. A recent rewrite brought a new major version along with it, so it is worth checking the current documentation rather than relying on older tutorials, since APIs and markup conventions can shift between releases.

For a programmer who enjoys small, focused front-end libraries, Timeline JS is a good subject to read and adapt. The source is a useful reference for thinking about navigation, media slides, and responsive behaviour, and the fact that content can live in a simple data file makes it easy to prototype an idea before committing to a larger design.

Pairing the library with an editorial, calm visual treatment suits it particularly well. Large uncropped photographs, generous spacing, and a restrained palette let the timeline breathe, while thin hairline borders and serif headlines keep the surrounding page feeling like a personal journal rather than a corporate product demo.