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Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that allows you to reliably send messages at no cost. It enables you to notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention.
When working with FCM, you might encounter an error message indicating InvalidJson. This typically occurs when the JSON payload sent to the FCM server is not properly formatted.
The error message might look something like this:
{
"error": "InvalidJson",
"message": "The JSON payload is malformed."
}
The InvalidJson error is triggered when the JSON payload does not adhere to the correct syntax. JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate.
To resolve the InvalidJson error, follow these steps:
Use a JSON validator tool to check for syntax errors. Tools like JSONLint or JSON Formatter & Validator can help identify issues in your JSON structure.
Try sending a simple JSON payload to ensure that the issue is not with the FCM server. For example:
{
"to": "/topics/all",
"notification": {
"title": "Test Message",
"body": "This is a test message."
}
}
By carefully validating and testing your JSON payload, you can resolve the InvalidJson error and ensure successful communication with Firebase Cloud Messaging. For more detailed guidance, refer to the official Firebase Cloud Messaging documentation.
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