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Logger backend to send Elixir logs to Logflare.
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An Elixir Logger backend for Logflare. Streams logs to the API or self-hosted Logflare app.

This package is under active development and not yet ready for production usage.


Get your api_key and create up a source at

You will need source_id which you can copy from your dashboard.

config :logger,
  level: :info, # or other Logger level,
  backends: [LogflareLogger.HttpBackend]

config :logflare_logger_backend,
  url: "", # is configured by defaul and you can set your own url
  api_key: "...",
  source_id: "...",
  flush_interval: 1_000, # minimum time in ms before a log batch is sent to the server ",
  max_batch_size: 50 # maximum number of events before a log batch is sent to the server


After configuring LogflareLogger in config.exs, use, Logger.error, ... functions to send log events to Logflare app.

Usage with context

LogflareLogger.context function signatures follows the one of Logger.metadata with slight modifications to parameters and return values.

# Merges map or keyword with existing context, will overwrite values.
LogflareLogger.context(%{user: %{id: 3735928559}})
LogflareLogger.context(user: %{id: 3735928559})

# Get all context entries or a value for a specific key

# Deletes all context entries or specific context key/value
LogflareLogger.context(user: nil)

Current limitations

Logflare log event BigQuery table schema is auto-generated per source. If you send a log with"first", user: %{id: 1}), Logflare will generate a metadata field of type integer. If in the future, you'll send a log event to the same source using"first", user: %{id: "d9c2feff-d38a-4671-8de4-a1e7f7dd7e3c"1}), the log with a binary id will be rejected.

LogflareLogger log payloads sent to Logflare API are encoded using BERT.

At this moment LogflareLogger doesn't support full one-to-one logging of Elixir types and applies the following conversions:

  • atoms converted to strings
  • charlists are converted to strings
  • tuples converted to arrays
  • keyword lists converted to maps
  • structs converted to maps
  • NaiveDateTime and DateTime are converted using the String.Chars protocol
  • pids are converted to strings

LogflareLogger doesn't support:

  • non-binary messages, e.g.{user_count: 1337})


LogflareLogger automatically logs all exceptions and formats stacktraces.


Run mix logflare_logger.verify_config to test your config.

Email for help!


If available in Hex, the package can be installed by adding logflare_logger_backend to your list of dependencies in mix.exs:

def deps do
    {:logflare_logger_backend, "~> 0.6.0"}

Documentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at

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