# Frequently Asked Questions
# Q. Which file should I use for my project?
A. In most cases, AllPrintings.json is the correct file. It contains all data for every printing of each card. Alternatively you can browse the per-set json files or download database images.
Note that the json files are minified, and not really human-readable: use a software like JQ to parse and process them.
# Q. Where does the data come from?
A. Data is collected from a variety of sources, including Gatherer, Scryfall, TCGPlayer, and many more. If you want to know more, or you would like to help, jump on our Discord!
# Q. How much does MTGJSON cost?
A. MTGJSON is free and open source under the MIT License. If you find it useful, please consider helping us to keep the lights on and develop new features for you with a donation to the project via PayPal (one-time donation) or via Patreon (recurring donations).
# Q. How can I help? I found a bug, have a suggestion, etc. Where can I report it?
# Q. How often is the data updated?
A. Full builds are available weekly at Tuesday, 12:01AM ET, but prices are available daily at 12:01AM ET. Also, when a new set is being previewed, that set will be rebuilt daily until the set is released.
# Q. Can I verify the downloaded files?
A. Yes. Every file has a SHA-256 file available at the same API location with an appended
# Q. Why is the file I just downloaded out of date?
A. You have probably received a cached version of the file. Try hard refreshing the website (
CTRL + F5 on Windows,
Shift + Command + R on Mac) and re-downloading to get the newest version.
# Q. How do I find the other card faces of "Meld" cards?
A. The most effective way to get the other cards for "Meld" cards is to access the
otherFaceIds property of any of the "Meld" cards. This property will return two
uuid values for the other associated cards.
Depending on your use case, this can be enough data to get the information you need, otherwise you can use those cards to access their
otherFaceIds to get the card you need by comparing the data that you have already.
# Q. What information is in AtomicCards.json?
A. AtomicCards.json only contains oracle information for each card. Any data that is persistent across the printings of a card will be included, such as
convertedManaCost, but anything that pertains to a specific printing of a card will NOT be included, such as
For a full list of properties, see the Card (Atomic) data model documentation. Note that depending on your use case you probably do not need this file, as it can be easily derived from
AllPrintings.json - handle with care.