Developer Templates

Save time with ready-to-use templates for developers. Explore practical templates for APIs, configuration files, documentation, web development, data formats, and common development tasks.

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Templates
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Filter by tool or category, then open a design in the matching free app.

82 of 82 templates

Dynamic — Event Invitation

Merge-tag template driven by {{ variables }}. Apply a JSON payload to patch real recipient and event data into the preview.

Email ViewerViewers

Dynamic — Event Showcase

Teal-and-cyan event invite with a two-column details card, an 'what to expect' list, dark mode, and {{ variables }} you can patch with a payload.

Email ViewerViewers

Dynamic — Order Confirmation

Charcoal order receipt with {{#each items}} line-item rows. Patch scalars and an items[] array via the Sample Payload dialog.

Email ViewerViewers

Premium — Rendering Showcase

Full-featured dark-mode showcase: hero, feature list, two-column cards, typography, buttons, and a compatibility matrix.

Email ViewerViewers

Premium — Product Launch

Bold blue launch announcement with dark-mode support and a feature checklist.

Email ViewerViewers

Premium — Welcome

Elegant dark-mode welcome with a hero and two highlight cards.

Email ViewerViewers

Premium — Newsletter

Editorial newsletter with a warm orange masthead, multiple stories, and dark-mode support.

Email ViewerViewers

Premium — Promotional

Bold flash-sale promo with an oversized discount, coupon code, and dark-mode support.

Email ViewerViewers

Premium — Transactional

Order confirmation with an itemized summary and dark-mode support.

Email ViewerViewers

Premium — Event Invitation

Conference invitation with a hero, event details, and dark-mode support.

Email ViewerViewers

Premium — Announcement

Company announcement with a bold hero and supporting copy, with dark-mode support.

Email ViewerViewers

Welcome — Get Started

Warm welcome with a single primary call to action.

Email ViewerViewers

Welcome — Onboarding Steps

Numbered setup checklist to activate new users.

Email ViewerViewers

Confirm Your Subscription

Double opt-in confirmation for newsletter sign-ups.

Email ViewerViewers

Verify Email (OTP Code)

One-time passcode with expiry note.

Email ViewerViewers

Verify Email (Link)

Single-click email verification link.

Email ViewerViewers

Reset Password

Password reset with time-limited link.

Email ViewerViewers

Password Changed

Security confirmation after a password update.

Email ViewerViewers

New Sign-in Alert

Security alert for a new device login.

Email ViewerViewers

Magic Login Link

Passwordless one-tap sign-in link.

Email ViewerViewers

Flash Sale — 48 Hours

High-impact limited-time promo with coupon code.

Email ViewerViewers

Event Invitation

Conference invite with date, time, and venue.

Email ViewerViewers

Product Announcement

Announce a new feature or launch with a badge.

Email ViewerViewers

Order Confirmation

Itemized order summary with totals and CTA.

Email ViewerViewers

Shipping Update

Dispatch notice with tracking number.

Email ViewerViewers

Order Delivered

Delivery confirmation with support prompt.

Email ViewerViewers

Payment Receipt

Clean itemized payment receipt.

Email ViewerViewers

Abandoned Cart

Recover a cart with a gentle nudge.

Email ViewerViewers

Review Request

Ask customers to rate a recent purchase.

Email ViewerViewers

Back in Stock

Notify shoppers a wishlist item returned.

Email ViewerViewers

Refund Processed

Confirm a refund and its timeline.

Email ViewerViewers

Invoice — Due

Itemized invoice with amount due and pay button.

Email ViewerViewers

Payment Failed

Dunning email to recover a failed charge.

Email ViewerViewers

Trial Ending Soon

Prompt users to upgrade before trial ends.

Email ViewerViewers

Subscription Renewed

Confirm an automatic renewal with receipt.

Email ViewerViewers

Subscription Canceled

Confirm cancellation with a win-back offer.

Email ViewerViewers

Usage Limit Reached

Alert on plan limits with an upgrade CTA.

Email ViewerViewers

Weekly Digest

Editorial newsletter with multiple stories.

Email ViewerViewers

Product Changelog

Release notes with grouped improvements.

Email ViewerViewers

Monthly Recap

Personalized stats recap of the month.

Email ViewerViewers

Blog Roundup

Curated links to recent articles.

Email ViewerViewers

Company Announcement

Formal announcement with a single CTA.

Email ViewerViewers

Webinar Invitation

Online session invite with agenda details.

Email ViewerViewers

Event Reminder

Last-minute reminder before an event.

Email ViewerViewers

Booking Confirmation

Reservation details with confirmation number.

Email ViewerViewers

RSVP Confirmation

Thank-you note confirming an RSVP.

Email ViewerViewers

Feedback Survey

Invite customers to a short survey.

Email ViewerViewers

NPS Rating

Net promoter score emoji rating email.

Email ViewerViewers

Win-back / Re-engagement

Re-engage inactive users with an offer.

Email ViewerViewers

Referral Invite

Reward-driven refer-a-friend promo.

Email ViewerViewers

Thank You

Simple, heartfelt thank-you message.

Email ViewerViewers

Account Anniversary

Celebrate a customer milestone with stats.

Email ViewerViewers

New Comment

Notify a user of a new comment or reply.

Email ViewerViewers

You Were Mentioned

Alert when someone @-mentions the user.

Email ViewerViewers

Weekly Report

Automated performance summary email.

Email ViewerViewers

Storage Almost Full

Warn users approaching a storage limit.

Email ViewerViewers

Job Offer

Formal offer letter with next steps.

Email ViewerViewers

Interview Invitation

Schedule details for a candidate interview.

Email ViewerViewers

Waitlist Confirmation

Confirm a spot on a product waitlist.

Email ViewerViewers

Donation Thank You

Acknowledge a donation with a receipt note.

Email ViewerViewers

Holiday Sale

Seasonal promotion with festive framing.

Email ViewerViewers

Welcome Discount

First-purchase coupon for new subscribers.

Email ViewerViewers

Coming Soon

Build anticipation for an upcoming launch.

Email ViewerViewers

New Feature Highlight

Spotlight a single new capability.

Email ViewerViewers

Interactive counter

Gradient card with plus, minus, and reset — good for panels + live preview.

HTML Viewer ProViewers

Product card

Dark product card with price and CTA — quick layout sandbox.

HTML Viewer ProViewers

Contact form

Light contact form with name, email, and message fields.

HTML Viewer ProViewers

Order payload

Nested customer, line items, and shipping meta for format/validate practice.

JSON Formatter & ConverterFormattersConverters

Product catalog

Store catalog array — try pretty-print, minify, or convert.

JSON Formatter & ConverterFormattersConverters

Person profile

Person object with address — useful for tree view and convert.

JSON Formatter & ConverterFormattersConverters

Event log

Compact event list for flatten, sort, and size checks.

JSON Formatter & ConverterFormattersConverters

API response

Typical API-shaped JSON for import and convert workflows.

JSON Formatter & ConverterFormattersConverters

Order document

Order with customer and items — format, validate, or convert to JSON.

XML Formatter & ConverterFormattersConverters

SOAP envelope

SOAP request with namespaces — good for XPath and tree view.

XML Formatter & ConverterFormattersConverters

App config

Feature flags and limits config for minify and pretty-print.

XML Formatter & ConverterFormattersConverters

RSS feed

RSS 2.0 channel starter for feed markup practice.

XML Formatter & ConverterFormattersConverters

Email address

Common email-shaped tokens (not RFC-perfect).

RegEx Visualizer & ExplainerTesters

HTTPS URL

Simple http(s) URL finder for notes and logs.

RegEx Visualizer & ExplainerTesters

Hex color

3- or 6-digit CSS hex colors.

RegEx Visualizer & ExplainerTesters

UUID / GUID

Hyphenated UUID/GUID hex strings.

RegEx Visualizer & ExplainerTesters

Whitespace runs

Match one or more whitespace characters (space, tab, newline).

RegEx Visualizer & ExplainerTesters

Frequently asked questions

Are these templates free?

Yes. Browse the library and open any template in the matching Tools Viewer app at no cost. No signup is required.

How do I customize a template?

Click Use template to open it in the related tool (for example Email Viewer or HTML Viewer Pro). Edit there, preview, and export when you are ready.

Is my template uploaded when I preview it?

No. Opening a template loads markup into the tool in your browser. Core editing and preview stay on your device unless you copy or export the result.