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Life & fun · January 11, 2025

Jist now searches JSON 17x faster than jq

Hi HN! Happy to share that jist can now search JSON 17x faster than jq for a provided input (string or a file). The major change is using the bleeding edge simdjson parser as the preferred way of parsing and querying the input. Since simdjson can only work on files up to 4.2GB, jist falls back to its earlier implementation of scanning through input in chunks of 1MB which means it can still query files of virtually infinite size 3x faster than jq ever could while using ~10MB of memory. The next major feature will be summarizing input JSON into a schema - and it will do this by scanning the…

Jist now searches JSON 17x faster than jq launched on January 11, 2025 with 7 votes and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.

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What it does

Search a JSON path and get the value fast. Contribute to adelamodwala/jist development by creating an account on GitHub.

jist attempts to find the complete JSON value (string, number, bool, or JSON object) for a given search key as fast as possible. You can also summarize a full json/ndjson file into a schema to you know... get the "jist" of it ;) jist uses the state-of-the art simdjson library for parsing JSON input / files smaller than 4.2GB in size. For files larger than 4.2GB or that don't fit into memory or forced streaming mode (option -s or --streaming ), jist falls back to an earlier implementation using a simple character based lexer json-tools . While the fallback implementation is relatively slower than simdjson, it's still really fast at a throughput of ~300MB/s and uses almost no memory (around…from github.com

In the maker’s words, at launch

Hi HN! Happy to share that jist can now search JSON 17x faster than jq for a provided input (string or a file). The major change is using the bleeding edge simdjson parser as the preferred way of parsing and querying the input. Since simdjson can only work on files up to 4.2GB, jist falls back to its earlier…

Does a similar job

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