Does JSON syntax allow duplicate keys in an object?
We can have duplicate keys in a JSON object, and it would still be valid. From practical application, I have seen the value from the last key is considered when duplicate keys are found in a JSON.
Does JSON Allow Duplicate Keys in Objects? Validity, Specs, and ...
Nov 28, 2025 · In this blog, we’ll dive into the JSON standard to clarify whether duplicate keys are allowed, explore how different parsers handle them, and discuss the real-world implications of using …
Duplicate Keys in JSON Objects - DZone
May 18, 2016 · We can have duplicate keys in a JSON object, and it would still be valid. The validity of duplicate keys in JSON is an exception and not a rule, so this becomes a problem when it comes to …
Can json have duplicate keys? | JSON Console
While JSON syntax technically allows duplicate keys in objects, it is strongly discouraged and considered bad practice. When an object contains duplicate keys, the behavior is undefined in the …
How to Resolve JSONException Due to Duplicate Keys in JSON
JSON objects must have unique keys to be valid, so encountered duplicates result in parsing errors. Here’s a structured approach to identifying and resolving this issue.
Duplicate Keys in JSON: Detection and Resolution Strategies
Learn how to identify duplicate keys in JSON documents and implement effective strategies to resolve these issues for valid JSON data.
How to make a field unique in JSON schema - Microsoft Q&A
Jan 10, 2022 · I am studying JSON schema, and I would like to seek your help on how to make a field unique in JSON schema. I have a simple schema containing StudentID that I want to make it unique …
python - json.loads allows duplicate keys in a dictionary, overwriting ...
Is there any way to catch it as exception in python, saying found duplicate keys in request from client ? The rfc 4627 for application/json media type recommends unique keys but it doesn't forbid them …
json/docs/rules/no-duplicate-keys.md at main · eslint/json
Disallow duplicate keys in JSON objects. The JSON specification doesn't explicitly forbid duplicate keys, but using them is considered a bad practice as it can lead to confusion and errors. Most parsers will …
JSON Syntax - W3Schools
JSON - Evaluates to JavaScript Objects The JSON format is almost identical to JavaScript objects. In JSON, keys must be strings, written with double quotes: