5 Production Mistakes That Changed How I Build Express APIs

Short summary

Production API failures rarely come from complex code—they result from ignoring fundamental practices. Five key lessons learned in production: validate all incoming requests early and explicitly to kill bad data at the boundary, write clear and specific error messages for easier debugging, ensure middleware is ordered correctly, implement strategic logging focused on request IDs and error stacks, and always rate-limit to prevent abuse. These basics prevent costly downtime.

• •Validate all requests early at the boundary to prevent bad data from reaching business logic
• •Use explicit error messages, correct middleware ordering, and focused logging for effective debugging
• •Always implement rate-limiting to prevent abuse and unexpected cost overruns

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