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Question-1. What is JSON?
Answer-1: JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and machines to parse and generate.
Question-2. What are the main data types in JSON?
Answer-2: JSON supports string, number, object, array, true, false, and null as data types.
Question-3. How do you represent an object in JSON?
Answer-3: Objects are represented using curly braces {} with key-value pairs. Example: {"key": "value"}.
Question-4. How do you represent an array in JSON?
Answer-4: Arrays are represented using square brackets []. Example: [1, 2, "text"].
Question-5. Can JSON keys have spaces?
Answer-5: Yes, JSON keys can have spaces, but they must be enclosed in double quotes. Example: {"key with space": "value"}.
Question-6. Is JSON case-sensitive?
Answer-6: Yes, JSON is case-sensitive.
Question-7. What file extension is used for JSON?
Answer-7: JSON files typically use the .json extension.
Question-8. What is the MIME type for JSON?
Answer-8: The MIME type for JSON is application/json.
Question-9. How are strings represented in JSON?
Answer-9: Strings are enclosed in double quotes. Example: "string".
Question-10. Can JSON have comments?
Answer-10: No, JSON does not support comments.
Question-11. How do you write null values in JSON?
Answer-11: Use the keyword null. Example: {"key": null}.
Question-12. What is the syntax for a JSON number?
Answer-12: JSON numbers can be integers or floating-point, with optional negative sign. Example: 123, -123, 12.34.
Question-13. What are the boolean values in JSON?
Answer-13: JSON supports true and false as boolean values.
Question-14. How do you represent nested objects in JSON?
Answer-14: Use another object inside the value of a key. Example: {"parent": {"child": "value"}}.
Question-15. Can JSON arrays contain different data types?
Answer-15: Yes, JSON arrays can contain mixed data types. Example: [1, "text", true].
Question-16. How do you parse JSON in JavaScript?
Answer-16: Use JSON.parse() to convert a JSON string into a JavaScript object.
Question-17. How do you stringify an object in JavaScript?
Answer-17: Use JSON.stringify() to convert a JavaScript object into a JSON string.
Question-18. What is the difference between JSON and XML?
Answer-18: JSON is simpler, lighter, and does not use tags, while XML uses a tag-based structure and is more verbose.
Question-19. Can JSON represent functions?
Answer-19: No, JSON does not support functions.
Question-20. What is a valid JSON key?
Answer-20: JSON keys must be strings enclosed in double quotes.
Question-21. How do you handle special characters in JSON strings?
Answer-21: Use escape sequences like \\, \", \n. Example: {"key": "value with \\n newline"}.
Question-22. How do you check if a JSON string is valid in JavaScript?
Answer-22: Use try and catch with JSON.parse().
Question-23. What are the benefits of using JSON?
Answer-23: JSON is lightweight, easy to read/write, and language-independent.
Question-24. How do you access a value in a JSON object in JavaScript?
Answer-24: Use dot notation or bracket notation. Example: object.key or object["key"].
Question-25. How do you iterate through a JSON array in JavaScript?
Answer-25: Use a for loop, forEach, or array methods like map().
Question-26. What happens if a JSON string has trailing commas?
Answer-26: It will result in a syntax error because JSON does not allow trailing commas.
Question-27. Can JSON be used for configuration files?
Answer-27: Yes, JSON is widely used for configuration files due to its simplicity and readability.
Question-28. How do you represent dates in JSON?
Answer-28: JSON does not have a specific date type; dates are usually represented as strings in ISO 8601 format.
Question-29. How do you send JSON data in an HTTP request?
Answer-29: Include the JSON in the request body and set the Content-Type header to application/json.
Question-30. Can you nest arrays in JSON?
Answer-30: Yes, JSON supports nested arrays. Example: [[1, 2], [3, 4]].
Question-31. What is the difference between JSON and JavaScript objects?
Answer-31: JSON is a string format, while JavaScript objects are in-memory representations with additional capabilities like functions.
Question-32. How do you handle large JSON data?
Answer-32: Use streaming libraries or pagination to handle large JSON data efficiently.
Question-33. What tools can validate JSON?
Answer-33: Tools like JSONLint and online validators can check JSON syntax.
Question-34. Can JSON be used with relational databases?
Answer-34: Yes, many relational databases now support JSON fields, such as PostgreSQL and MySQL.
Question-35. How do you merge two JSON objects in JavaScript?
Answer-35: Use the spread operator ({...obj1, ...obj2}) or Object.assign().
Question-36. How do you handle circular references in JSON?
Answer-36: JSON does not support circular references; you'll need to preprocess the data to remove them.
Question-37. What is JSONP?
Answer-37: JSONP (JSON with Padding) is a method to request JSON data from a server in a cross-domain manner.
Question-38. Can JSON store binary data?
Answer-38: JSON does not natively support binary data; binary data must be encoded as a string (e.g., Base64).
Question-39. How do you convert JSON to an array in JavaScript?
Answer-39: Parse the JSON using JSON.parse().
Question-40. Can JSON contain duplicate keys?
Answer-40: JSON does not prevent duplicate keys, but behavior depends on the parser (usually, the last value overrides the previous ones).
Question-41. What are some common JSON parsing errors?
Answer-41: Errors include invalid syntax, unexpected tokens, and unescaped characters.
Question-42. How do you pretty-print JSON?
Answer-42: Use JSON.stringify(object, null, 2) to format JSON with indentation.
Question-43. Can JSON be encrypted?
Answer-43: Yes, JSON can be encrypted using encryption algorithms for secure transmission.
Question-44. How do you include special Unicode characters in JSON?
Answer-44: Use Unicode escape sequences like \uXXXX. Example: \u263A for ?.
Question-45. What is JSON Schema?
Answer-45: JSON Schema is a specification for validating the structure of JSON data.
Question-46. How do you validate JSON with JSON Schema?
Answer-46: Use JSON Schema libraries available for many programming languages.
Question-47. Can JSON be used with NoSQL databases?
Answer-47: Yes, many NoSQL databases like MongoDB and CouchDB use JSON or JSON-like formats for storing data.
Question-48. How do you represent nested structures in JSON?
Answer-48: Use nested objects and arrays. Example: {"key": {"nestedKey": "value"}}.
Question-49. What is the maximum size of a JSON file?
Answer-49: JSON does not have a size limit, but practical limits depend on the application and memory.
Question-50. What are the security concerns with JSON?
Answer-50: Risks include injection attacks, insecure parsing, and exposure of sensitive data. Use safe practices like escaping and validation.
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