The input JSON data is malformed. – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

Briefly, this error message indicates that the input JSON data provided to Elasticsearch is not well-formed or invalid. JSON (JavaScript Object Notation) is a lightweight data interchange format that is commonly used in web applications. To resolve this issue, you should carefully review the JSON data and ensure that it is well-formed and syntactically correct. You can use a JSON validator to check the syntax of the JSON data. Additionally, you may want to review the Elasticsearch documentation on JSON syntax to ensure that you are using the correct format and parameters.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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This guide will help you check for common problems that cause the log ” The input JSON data is malformed. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “The input JSON data is malformed.”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

token = parser.nextToken();
 } catch (JsonParseException e) {
 if (errorCounter >= PARSE_ERRORS_LIMIT) {
 logger.error("Failed to recover from malformed JSON data."; e);
 throw new ElasticsearchParseException("The input JSON data is malformed.");
 } while (token != XContentParser.Token.END_OBJECT);


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