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Strings, the default output of LLMs, can be converted into other formats. For example, if you ask an LLM to produce a JSON object, you will need to convert the result (i.e. a JSON string) to its corresponding JSON object. On this page, we will introduce Relevance’s String to JSON converter. Please keep in mind that we use LLM output as a string example but the content applies to any JSON string conversion.

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How to use the String to JSON converter step

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Add the component

Add a “Convert string to JSON” step to your Tool (check how to get started with creating a tool). Convert string to JSON step

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Text input

Provide the JSON string as the input. In the image below, we pass in the LLM step answer as input into the converter step and the output is the corresponding JSON object. String to json
Make sure, the input string is a valid JSON otherwise this component will raise an error.When instructing an LLM to generate a JSON object, it is recommended to also set up the is_json validator.
Follow the links below for more information about

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Common errors

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Invalid JSON

When the provided input text is not a valid JSON string, similar errors to the one noted below will occur. 
Unexpected token u in JSON at position 0
Fix the input (i.e. make sure it is representing a valid JSON string) and try again.