Flatten JSON Online
Free json flattener tool
Flatten JSON Online launched on April 12, 2025 with 10 votes, #3,208 of 7,818 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Flatten nested JSON structures online with our free tool. Upload your JSON file and instantly convert nested objects into a flat key-value format. Fast, secure, and no signup needed.
Flatten JSON online instantly with our free JSON flattener tool. Convert nested JSON to flat structure, flatten JSON objects and arrays with dot notation. Fast, secure, browser-based - no upload needed!
Analyzing deeply nested JSON in Excel or a database is nearly impossible. Our flattener turns complex JSON structures into simple key-value pairs that are easy to read and export. It's a quick way to clean up your data for spreadsheets without writing a single line of code. { "user" : { "name" : "Alice" , "address" : { "city" : "Portland" , "zip" : "97201" } , "tags" : [ "admin" , "editor" ] } } Flattened Output json Copy { "user.name" : "Alice" , "user.address.city" : "Portland" , "user.address.zip" : "97201" , "user.tags[0]" : "admin" , "user.tags[1]" : "editor" } Delimiter Comparison Choose the right separator import json def flatten_json ( obj , parent_key = "" , sep = "." ) : items = {…from merge-json-files.com
Does a similar job
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Convert JSON to JSONL Online2025 · merge-json-files.com · ▲7Free Online JSON to JSONL Converter Tool
JSON File Splitter Online2025 · merge-json-files.com · ▲9Split large JSON files online quickly and easily 100% free
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