Writing a backend API usually requires the following steps:
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Design API interface: define API request methods, request parameters and return results, etc. Tools such as Swagger or OpenAPI can be used for API interface design.
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Write API code: According to the API interface design, use the back-end framework (such as Flask, Django, etc.) to write API code to realize the specific functions of the API.
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Database operation: If the API needs to interact with the database, you need to write database operation codes, such as SQL query statements or ORM framework operations.
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Interface test: Use Postman or other tools to test the written API to ensure that the API can work normally.
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Deploy API: Deploy the API to the server so that it can be accessed externally.
It should be noted that the writing of the API needs to consider factors such as security, performance and maintainability. When writing an API, you should follow the RESTful API design principles, use the HTTPS protocol to encrypt communication, verify and filter request parameters, and encrypt sensitive information to improve API security. At the same time, the performance of the API should be optimized, such as using cache, compressing response data, etc., to improve the response speed of the API. Finally, you should write clear and easy-to-maintain code, follow coding standards and annotation requirements, and facilitate subsequent maintenance and upgrades.