langflow/docs/docs/Components/components-processing.md

title	slug
Processing	/components-processing

Processing components in Langflow

Processing components process and transform data within a flow.

Use a processing component in a flow

The Split Text processing component in this flow splits the incoming Data into chunks to be embedded into the vector store component.

The component offers control over chunk size, overlap, and separator, which affect context and granularity in vector store retrieval results.

Alter metadata

This component modifies metadata of input objects. It can add new metadata, update existing metadata, and remove specified metadata fields. The component works with both Message and Data objects, and can also create a new Data object from user-provided text.

Inputs

Name	Display Name	Info
input_value	Input	Objects to which Metadata should be added
text_in	User Text	Text input; the value will be in the 'text' attribute of the Data object. Empty text entries are ignored.
metadata	Metadata	Metadata to add to each object
remove_fields	Fields to Remove	Metadata Fields to Remove

Outputs

Name	Display Name	Info
data	Data	List of Input objects, each with added metadata

Combine text

This component concatenates two text sources into a single text chunk using a specified delimiter.

Inputs

Name	Display Name	Info
first_text	First Text	The first text input to concatenate.
second_text	Second Text	The second text input to concatenate.
delimiter	Delimiter	A string used to separate the two text inputs. Defaults to a space.

Outputs

Name	Display Name	Info
message	Message	A Message object containing the combined text.

Create data

:::important This component is in Legacy, which means it is no longer in active development as of Langflow version 1.1.3. :::

This component dynamically creates a Data object with a specified number of fields.

Inputs

Name	Display Name	Info
number_of_fields	Number of Fields	The number of fields to be added to the record.
text_key	Text Key	Key that identifies the field to be used as the text content.
text_key_validator	Text Key Validator	If enabled, checks if the given Text Key is present in the given Data.

Outputs

Name	Display Name	Info
data	Data	A Data object created with the specified fields and text key.

Data combiner

:::important Prior to Langflow version 1.1.3, this component was named Merge Data. :::

This component combines multiple data sources into a single unified Data object.

The component iterates through the input list of data objects, merging them into a single data object. If the input list is empty, it returns an empty data object. If there's only one input data object, it returns that object unchanged. The merging process uses the addition operator to combine data objects.

Inputs

Name	Display Name	Info
data	Data	A list of data objects to be merged.

Outputs

Name	Display Name	Info
merged_data	Merged Data	A single Data object containing the combined information from all input data objects.

DataFrame operations

This component performs the following operations on Pandas DataFrame:

Operation	Description	Required Inputs
Add Column	Adds a new column with a constant value	new_column_name, new_column_value
Drop Column	Removes a specified column	column_name
Filter	Filters rows based on column value	column_name, filter_value
Head	Returns first n rows	num_rows
Rename Column	Renames an existing column	column_name, new_column_name
Replace Value	Replaces values in a column	column_name, replace_value, replacement_value
Select Columns	Selects specific columns	columns_to_select
Sort	Sorts DataFrame by column	column_name, ascending
Tail	Returns last n rows	num_rows

Inputs

Name	Display Name	Info
df	DataFrame	The input DataFrame to operate on.
operation	Operation	Select the DataFrame operation to perform. Options: Add Column, Drop Column, Filter, Head, Rename Column, Replace Value, Select Columns, Sort, Tail
column_name	Column Name	The column name to use for the operation.
filter_value	Filter Value	The value to filter rows by.
ascending	Sort Ascending	Whether to sort in ascending order.
new_column_name	New Column Name	The new column name when renaming or adding a column.
new_column_value	New Column Value	The value to populate the new column with.
columns_to_select	Columns to Select	List of column names to select.
num_rows	Number of Rows	Number of rows to return (for head/tail). Default: 5
replace_value	Value to Replace	The value to replace in the column.
replacement_value	Replacement Value	The value to replace with.

Outputs

Name	Display Name	Info
output	DataFrame	The resulting DataFrame after the operation.

Data to message

:::important Prior to Langflow version 1.1.3, this component was named Parse Data. :::

The ParseData component converts data objects into plain text using a specified template. This component transforms structured data into human-readable text formats, allowing for customizable output through the use of templates.

Inputs

Name	Display Name	Info
data	Data	The data to convert to text.
template	Template	The template to use for formatting the data. It can contain the keys {text}, {data}, or any other key in the data.
sep	Separator	The separator to use between multiple data items.

Outputs

Name	Display Name	Info
text	Text	The resulting formatted text string as a Message object.

Filter data

:::important This component is in Beta as of Langflow version 1.1.3, and is not yet fully supported. :::

This component filters a Data object based on a list of keys.

Inputs

Name	Display Name	Info
data	Data	Data object to filter.
filter_criteria	Filter Criteria	List of keys to filter by.

Outputs

Name	Display Name	Info
filtered_data	Filtered Data	A new Data object containing only the key-value pairs that match the filter criteria.

Filter values

:::important This component is in Beta as of Langflow version 1.1.3, and is not yet fully supported. :::

The Filter values component filters a list of data items based on a specified key, filter value, and comparison operator.

Inputs

Name	Display Name	Info
input_data	Input data	The list of data items to filter.
filter_key	Filter Key	The key to filter on, for example, 'route'.
filter_value	Filter Value	The value to filter by, for example, 'CMIP'.
operator	Comparison Operator	The operator to apply for comparing the values.

Outputs

Name	Display Name	Info
filtered_data	Filtered data	The resulting list of filtered data items.

JSON cleaner

The JSON cleaner component cleans JSON strings to ensure they are fully compliant with the JSON specification.

Inputs

Name	Display Name	Info
json_str	JSON String	The JSON string to be cleaned. This can be a raw, potentially malformed JSON string produced by language models or other sources that may not fully comply with JSON specifications.
remove_control_chars	Remove Control Characters	If set to True, this option removes control characters (ASCII characters 0-31 and 127) from the JSON string. This can help eliminate invisible characters that might cause parsing issues or make the JSON invalid.
normalize_unicode	Normalize Unicode	When enabled, this option normalizes Unicode characters in the JSON string to their canonical composition form (NFC). This ensures consistent representation of Unicode characters across different systems and prevents potential issues with character encoding.
validate_json	Validate JSON	If set to True, this option attempts to parse the JSON string to ensure it is well-formed before applying the final repair operation. It raises a ValueError if the JSON is invalid, allowing for early detection of major structural issues in the JSON.

Outputs

Name	Display Name	Info
output	Cleaned JSON String	The resulting cleaned, repaired, and validated JSON string that fully complies with the JSON specification.

LLM router

This component routes requests to the most appropriate LLM based on OpenRouter model specifications.

Inputs

Name	Display Name	Info
models	Language Models	List of LLMs to route between
input_value	Input	The input message to be routed
judge_llm	Judge LLM	LLM that will evaluate and select the most appropriate model
optimization	Optimization	Optimization preference (quality/speed/cost/balanced)

Outputs

Name	Display Name	Info
output	Output	The response from the selected model
selected_model	Selected Model	Name of the chosen model

Message to data

This component converts Message objects to Data objects.

Inputs

Name	Display Name	Info
message	Message	The Message object to convert to a Data object.

Outputs

Name	Display Name	Info
data	Data	The converted Data object.

Parse DataFrame

This component converts DataFrames into plain text using templates.

Inputs

Name	Display Name	Info
df	DataFrame	The DataFrame to convert to text rows
template	Template	Template for formatting (use {column_name} placeholders)
sep	Separator	String to join rows in output

Outputs

Name	Display Name	Info
text	Text	All rows combined into single text

Parse JSON

:::important This component is in Legacy, which means it is no longer in active development as of Langflow version 1.1.3. :::

This component converts and extracts JSON fields using JQ queries.

Inputs

Name	Display Name	Info
input_value	Input	Data object to filter (Message or Data).
query	JQ Query	JQ Query to filter the data

Outputs

Name	Display Name	Info
filtered_data	Filtered Data	Filtered data as list of Data objects.

Select data

:::important This component is in Legacy, which means it is no longer in active development as of Langflow version 1.1.3. :::

This component selects a single Data item from a list.

Inputs

Name	Display Name	Info
data_list	Data List	List of data to select from
data_index	Data Index	Index of the data to select

Outputs

Name	Display Name	Info
selected_data	Selected Data	The selected Data object.

Split text

This component splits text into chunks based on specified criteria.

Inputs

Name	Display Name	Info
data_inputs	Input Documents	The data to split.The component accepts Data or DataFrame objects.
chunk_overlap	Chunk Overlap	The number of characters to overlap between chunks. Default: 200.
chunk_size	Chunk Size	The maximum number of characters in each chunk. Default: 1000.
separator	Separator	The character to split on. Default: newline.
text_key	Text Key	The key to use for the text column (advanced). Default: text.

Outputs

Name	Display Name	Info
chunks	Chunks	List of split text chunks as Data objects.
dataframe	DataFrame	List of split text chunks as DataFrame objects.

Update data

This component dynamically updates or appends data with specified fields.

Inputs

Name	Display Name	Info
old_data	Data	The records to update
number_of_fields	Number of Fields	Number of fields to add (max 15)
text_key	Text Key	Key for text content
text_key_validator	Text Key Validator	Validates text key presence

Outputs

Name	Display Name	Info
data	Data	Updated Data objects.