QR Codes for Software Developers
App installs, docs, and secure setup
Developers use QR codes in two ways: product codes that open app downloads, docs, and beta invites, and security codes their app generates for authenticator setup.
NIST’s current authentication guidelines, SP 800-63B-4, describe using a QR code to move a secret from a login screen to an authenticator app.
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Where Developers Use QR Codes
Some codes you print, and some your software creates for each user.
App Downloads
From the slide to the store
A code on a conference slide or package opens your App Store or Google Play listing.
Documentation
The guide at the point of setup
A code on hardware or a quick-start card opens the setup guide or API reference.
Beta Invites
Testers in one scan
A code at a meetup opens your beta signup or test build page.
Authenticator Setup
Secrets that never get typed
Your app shows a one-time QR code so users can add an account to their authenticator app.
What Is a QR Code for Software Developers?
A software developer QR code is either a static printed code that opens downloads, docs, or beta signups, or a code your own application generates at runtime to pass a secret or pairing data to a user’s device. TLinky handles the first kind; authentication codes must come from your own backend.
What NIST SP 800-63B-4 Says About QR Codes
The NIST SP 800-63B-4 authenticator requirements mention QR codes in two places.
- Out-of-band transfer: A user may view a secret in their session and use a barcode or QR code to transfer it to an app on their mobile device.
- OTP key strength: The secret key and algorithm for OTP authenticators must provide at least 112 bits of security strength, the current SP 800-131A minimum.
- Hybrid connections: Passkey-style hybrid connections use a displayed QR code for initial keying, plus wireless data to prove the devices are close together.
- Range limit: That wireless data must use a technology with a maximum effective range of no more than 240 meters.
- Why it matters: The proximity check reduces the chance of a phishing site pairing an authenticator with an attacker’s device.
What a Developer QR Code Can Open
- App store listing: Your App Store or Google Play page.
- Docs and API reference: Setup guides for SDKs, devices, or integrations.
- Changelog: Release notes for the current version.
- Beta signup: A form or test build page for new testers.
- Feedback form: Bug reports from conference attendees and early users.
How to Create a Developer QR Code in TLinky
Use TLinky for codes you print and share, never for authentication secrets, which must be generated by your own system for each user.
Here is the step by step guide:
- Log in to your TLinky account, click Create, then select QR Code.
- Name the code and choose a domain (domains apply to dynamic codes and depend on your plan).
- Select Application for app store links, or Link for docs, changelogs, and beta pages.
- Enter the store links or page URL.
- Customize Templates, Colors, and Design to match your product, click Generate QR, then Save Changes and download.
Pro Tip: Point printed doc codes to a stable docs URL that always redirects to the latest version.
Ship the Link With the Product
Where Developers Place QR Codes
- Conference slides and booths: App downloads and beta signups.
- Hardware and packaging: Setup guides and firmware notes.
- Quick-start cards: API keys stay private; the code opens the getting-started guide.
- Swag and stickers: Your GitHub, docs, or community page on QR code stickers and labels.
- Release posters: The changelog for a new version.
- Product website: A QR code for your website download page lets desktop visitors continue on their phone.
Keep Developer Codes Secure
- Never put secrets in a printed code: API keys, passwords, and OTP seeds do not belong on anything you print or share.
- Generate auth QR codes server-side: Create a fresh code per user and session, and expire it after enrollment.
- Use approved randomness: NIST requires secrets to come from an approved random bit generator.
- Keep doc links stable: Avoid version-specific URLs on hardware that stays in the field for years.
- Test both platforms: Scan app download codes on iPhone and Android before printing.
Docs Move, Hardware Stays
Change where a printed code points as docs move or a new version ships, and hardware already in the field still opens the right page.
Software Developer QR Code Questions
Can TLinky generate MFA setup QR codes?
No, and it should not. Authenticator setup codes carry a per-user secret, so your own backend must generate them for each enrollment. Use TLinky for public links like docs and downloads.
How strong must an OTP secret be under NIST SP 800-63B-4?
The secret key and its algorithm must provide at least 112 bits of security strength, the minimum in the current SP 800-131A revision.
How is a passkey QR code different from a TOTP QR code?
A TOTP code transfers a shared secret once. A passkey hybrid QR code starts a key exchange, and NIST requires wireless proximity data with a range of no more than 240 meters.
Should an app download code go to one store or both?
Cover both platforms. If one code cannot serve both, print separate App Store and Google Play codes, or link to a page on your site that lists both stores.
What should a hardware QR code open?
A stable setup guide URL that you can redirect as documentation changes, so devices already sold still open current instructions.
See How QR Codes Can Grow Your Business
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Put app downloads, docs, and beta signups on every slide, package, and quick-start card, then redirect each code as new versions ship.