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software-design/idempotency-why-clicking-pay-twice-should-charge-you-once.md
Idempotency: why clicking Pay twice should charge you once
You tap Pay, the screen shows an error, you tap again, and your card is charged twice. Networks drop messages, so a phone often cannot tell…
web/what-is-json-edit-it-live-and-see-why-apis-are-so-strict-about-it.md
What is JSON? Edit it live and see why APIs are so strict about it
When an app asks a server for data, the reply has to travel as plain text. JSON is the format most web APIs use: six kinds of value…